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XMMSTACKOB - XMM-Newton Serendipitous Source Catalog from Stacked Observations (4XMM-DR13s): Observation Data

HEASARC
Archive

Overview

The stacked catalog 4XMM-DR13s (XMMSTACK) has been compiled from 1,688 groups, comprising 9,796 overlapping good-quality XMM-Newton observations. They were selected from the public observations taken between 2000 February 1 and 2022 November 29 which overlap by at least one arcminute in radius. It contains 401,596 unique sources, 310,478 of them multiply observed, with positions and source parameters like fluxes in the XMM-Newton standard energy bands, hardness ratios, quality estimate, and information on inter-observation variability. The parameters are directly derived from the simultaneous fit, and, wherever applicable, additionally calculated for each contributing observation. Exposures that do not qualify for source detection, for example because of a high background level, are used for subsequent PSF photometry: source fluxes and flux-related parameters are derived for them at the source position and extent found during source detection. 4XMM-DR13s lists 1,683,264 individual flux measurements of the 401,596 unique sources.

Stacked source detection aims at exploring the multiply observed sky regions and exploit their survey potential, in particular to study the long-term behavior of X-ray emitting sources. It thus makes use of the long(er) effective exposure time per sky area and offers the opportunity to investigate flux variability directly through the source detection process. The main catalog properties are summarized in the table below, the data processing and the stacked source detection are described in the processing summary. To ensure detection quality, background levels are assessed, and event-based astrometric corrections are applied before running source detection. After source detections, problematic detections and detection parameters are flagged by an automated algorithm. All detections are screened visually, and obviously spurious sources are flagged manually.

This table contains the source parameters from the individual observations in the stacked catalog, 4XMM-DR13s. The parameters are derived from the simultaneous source-detection fit to all stacked observations at the common source position for each observation that covers a source, amounting to 1,683,264 measurements. The mean source parameters from stacked source detection are provided in the associated main table 4XMM-DR13s, referred to as XMMSTACK.

The authors referred to the EPIC instruments with the following designations: PN, M1 (MOS1), and M2 (MOS2). The energy bands used in the 4XMM processing were the same as for the 3XMM catalog.

The following are the basic energy bands:

     1:  0.2-0.5 keV
     2:  0.5-1.0 keV
     3:  1.0-2.0 keV
     4:  2.0-4.5 keV
     5:  4.5-12.0 keV
All-EPIC values cover the energy range 0.2-12.0 keV.

The full catalog documentation can be found at https://xmmssc.aip.de/.

The following table gives an overview of the statistics of this catalog in comparison with the previous stacked catalogs, 4XMM-DR13s through 3XMM-DR7s:

                                                       4XMM-DR13s          4XMM-DR12s          4XMM-DR11s          4XMM-DR10s          4XMM-DR9s           3XMM-DR7s

Number of stacks                                       1,688               1,620               1,475               1,396               1,329               434

Number of observations                                 9,796               9,355               8,292               7,803               6,604               789

Time span first to last observation                    Feb 01, 2000        Feb 01, 2000        Feb 03, 2000        Feb 03, 2000        Feb 03, 2000        Feb 20, 2000
                                                       -- Nov 29, 2022     -- Dec 04, 2021     -- Dec 17, 2020     -- Dec 14, 2019     -- Nov 13, 2018     -- Apr 02, 2016

Approximate sky coverage (sq. deg.)                    650                 625                 560                 540                 485                 150

Approximate multiply observed sky area(sq. deg)        420                 400                 350                 335                 300                 100

Total number of sources                                401,596             386,043             358,809             335,812             288,191             71,951

Sources with several contributing observations         310,478             298,626             275,440             256,213             218,283             57,665

Multiply observed sources with flag 0 or 1             262,842             252,445             233,542             216,999             191,497             55,450

Multiply observed with a total detection               251,555             241,880             224,178             208,921             181,132             49,935
         likelihood of at least six

Multiply observed with a total detection               213,812             205,394             189,556             176,680             153,487             42,077
         likelihood of at least ten

Total measurements                                     1,683,264           1,592,263           1,421,966           1,322,299           1,033,264           216,393

Maximum exposures per source                           170                 155                 140                 140                 103                 69

Maximum observations per source                        77                  70                  65                  65                  40                  23

Maximum on-time per source                             2.8 Ms              2.8 Ms              2.8 Ms              2.8 Ms              1.9 Ms              1.3 Ms

Catalog Bibcode

2020A&A...641A.137T

References

Traulsen et al. (2020), "The XMM-Newton serendipitous survey. X: The
second source catalogue from overlapping XMM-Newton observations and its
long-term variable content", <A&A, 641, A137 (2020)>
(2020A&A...641A.137T)

Traulsen et al. (2019), "The XMM-Newton serendipitous survey. VIII: The first
XMM-Newton serendipitous source catalogue from overlapping observations",
<A&A, 624, A77 (2019)> (2019A&A...624A..77T)
Users of the catalog are kindly asked to reference the above paper, Traulsen+ 2020 (A&A 641, A137), and to include the following policy statement in their work: "This research has made use of data obtained from the 4XMM XMM-Newton serendipitous stacked source catalogue 4XMM-DR13s compiled by the institutes of the XMM-Newton Survey Science Centre selected by ESA."

Provenance

This database table was last updated by the HEASARC in December 2023 in order to remove 49 duplicate entries. It contains the 4XMM-DR13s source catalog, released by ESA on 2023-06-12 and obtained from the XMM-Newton Survey Science Center Consortium at https://xmmssc.aip.de/cms/catalogues/4xmm-dr13s/. It is also available as a gzipped FITS file.

Parameters

SrcID
The unique identifier assigned to the source detection.

ObsID
The unique identifier of the XMM-Newton observation.

Name
The source designation in the style of the 4XMM IAU names. The prefix on each of the names ends with an "s" to signify it is a stacked source.

N_Exp
The number of exposures covering the source. The number of exposures with which the source was fitted.

N_Exp_Sdet
The number of exposures used in source detection.

N_Exp_Phot
The number of exposures used for PSF photometry.

RA
The Right Ascension in the specified equinox. The position of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

Dec
The Declination of the source in the specified equinox. The position of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

LII
Galactic Longitude. The position of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

BII
Galactic Latitude. The position of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

Error_Radius
Square root of the squared sum of the 1-sigma uncertainties in the Right Ascension and Declination, in arcseconds. The combined position error, ERROR_RADIUS, is calculated from the errors of the image coordinates: sqrt(X_PIXEL_ERROR2+Y_PIXEL_ERROR2). For symmetric errors in both dimensions, ERROR_RADIUS/sqrt(2) is the one-dimensional 1-sigma position uncertainty, giving the coordinate interval that includes 68% of normally distributed data points, and sqrt(2.3/2)*ERROR_RADIUS is the two-dimensional error, giving the radius of a circularized ellipse that include 68% of normally distributed data points.

X_Pixel
X coordinate within the rebinned image. The position of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

X_Pixel_Error
1-sigma uncertainty in X coordinate within the rebinned image. The position error of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

Y_Pixel
Y coordinate within the rebinned image. The position of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

Y_Pixel_Error
1-sigma uncertainty in Y coordinate within the rebinned image. The position error of the source is the result of the simultaneous fit and considered to be the same for the stack (in xmmstack) and associated individual observations.

Dist_NN
The distance to the nearest neighboring detection, in arcseconds.

N_Blend
The number of simultaneously fitted sources.

Name_Detcat
The IAU source designation assigned to the nearest unique source in 4XMM-DR13.

Srcid_Detcat
The unique source identifier of the nearest source in 4XMM-DR13 within the correlation radius. Two sources are associated if their separation is no larger than three times the sum of their position errors, which is assumed to be at least one arcsecond to account for systematic errors. The matching radius per source is therefore:

       rmatch = max (1", 3 x [ ERROR_RADIUS + ERROR_RADIUS_DETCAT ])
A null value refers to the case where no counterpart is found.

Detid_Detcat
Detection identifier of the nearest unique 4XMM-DR13 source in OBSID. (DETID in 4XMM-DR13)

RA_Detcat
The mean right ascension of the 4XMM-DR13 source and its contributing detections after field rectifications.

Dec_Detcat
The mean declination of the 4XMM-DR13 source and its contributing detections after field rectifications.

Error_Radius_Detcat
The position error of the 4XMM-DR13 source and its contributing detections including statistical and systematic errors from the field rectifications.

Dist_Detcat
The distance between the OBSID source and the nearest unique source in 4XMM-DR13, in arcsec.

EP_Flux
The weighted mean of the all-EPIC flux between 0.2 - 12.0 keV, in units of erg/s/cm2. This is the dead-time corrected count rates in the entire PSF, multiplied with the respective energy conversion factors (see Mateos et al., 2009, A&A, 496, 879). If the exposure is zero, for example on chip gaps, or if the covered PSF fraction is below 15%, this is set to "Null".

EP_Flux_Error
1-sigma uncertainty in weighted mean of the all-EPIC flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_1_Flux
The weighted mean of the EPIC band 1 flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_1_Flux_Error
1-sigma uncertainty in weighted mean of the EPIC band 1 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_2_Flux
The weighted mean of the EPIC band 2 flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_2_Flux_Error
1-sigma uncertainty in the weighted mean of the EPIC band 2 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_3_Flux
The weighted mean of the EPIC band 3 flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_3_Flux_Error
1-sigma uncertainty in weighted mean of the EPIC band 3 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_4_Flux
The weighted mean of the EPIC band 4 flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_4_Flux_Error
1-sigma uncertainty in weighted mean of the EPIC band 4 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_5_Flux
The weighted mean of the EPIC band 5 flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_5_Flux_Error
1-sigma uncertainty in weighted mean of the EPIC band 5 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_Flux
The weighted mean of the total (over all energy bands) PN flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_Flux_Error
1-sigma uncertainty in weighted mean of the total (over all energy bands) PN flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_1_Flux
PN band 1 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_1_Flux_Error
1-sigma uncertainty in the PN band 1 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_2_Flux
PN band 2 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_2_Flux_Error
1-sigma uncertainty in the PN band 2 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_3_Flux
PN band 3 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_3_Flux_Error
1-sigma uncertainty in the PN band 3 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_4_Flux
PN band 4 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_4_Flux_Error
1-sigma uncertainty in the PN band 4 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_5_Flux
PN band 5 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_5_Flux_Error
1-sigma uncertainty in the PN band 5 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_Flux
The total (over all energy bands) MOS1 flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_Flux_Error
1-sigma uncertainty of the total (over all energy bands) MOS1 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_1_Flux
The MOS1 band 1 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_1_Flux_Error
1-sigma uncertainty of the MOS1 band 1 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_2_Flux
The MOS1 band 2 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_2_Flux_Error
1-sigma uncertainty in MOS1 band 2 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_3_Flux
The MOS1 band 3 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_3_Flux_Error
1-sigma uncertainty in MOS1 band 3 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_4_Flux
The MOS1 band 4 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_4_Flux_Error
1-sigma uncertainty in MOS1 band 4 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_5_Flux
The MOS1 band 5 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_5_Flux_Error
1-sigma uncertainty in MOS1 band 5 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_Flux
The total (over all energy bands) MOS2 flux, in units of erg/s/cm2. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_Flux_Error
1-sigma uncertainty of the total (over all energy bands) MOS2 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_1_Flux
The MOS2 band 1 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_1_Flux_Error
1-sigma uncertainty of the MOS2 band 1 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_2_Flux
The MOS2 band 2 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_2_Flux_Error
1-sigma uncertainty in MOS2 band 2 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_3_Flux
The MOS2 band 3 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_3_Flux_Error
1-sigma uncertainty in MOS2 band 3 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_4_Flux
The MOS2 band 4 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_4_Flux_Error
1-sigma uncertainty in MOS2 band 4 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_5_Flux
The MOS2 band 5 flux, in units of erg/s/cm2, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_5_Flux_Error
1-sigma uncertainty in MOS2 band 5 flux, in units of erg/s/cm2. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_Rate
The all-EPIC count rate between 0.2 and 12.0 keV background-subtracted and vignetting-corrected in the entire PSF. This is the sum of the count rates of each instrument. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_Rate_Error
1-sigma uncertainty in the all-EPIC count rate. This is calculated as the square root of the quadratic sum of the errors per instrument. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_Rate
The total (over all energy bands) PN count rate. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_Rate_Error
1-sigma uncertainty in the total (over all energy bands) PN count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_1_Rate
PN band 1 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_1_Rate_Error
1-sigma uncertainty in the PN band 1 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_2_Rate
PN band 2 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_2_Rate_Error
1-sigma uncertainty in the PN band 2 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_3_Rate
PN band 3 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_3_Rate_Error
1-sigma uncertainty in the PN band 3 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_4_Rate
PN band 4 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_4_Rate_Error
1-sigma uncertainty in the PN band 4 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_5_Rate
PN band 5 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_5_Rate_Error
1-sigma uncertainty in the PN band 5 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_Rate
The total (over all energy bands) MOS1 count rate. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_Rate_Error
1-sigma uncertainty in the total MOS1 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_1_Rate
The MOS1 band 1 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_1_Rate_Error
1-sigma uncertainty in MOS1 band 1 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_2_Rate
The MOS1 band 2 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_2_Rate_Error
1-sigma uncertainty in MOS1 band 2 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_3_Rate
The MOS1 band 3 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_3_Rate_Error
1-sigma uncertainty in MOS1 band 3 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_4_Rate
The MOS1 band 4 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_4_Rate_Error
1-sigma uncertainty in MOS1 band 4 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_5_Rate
The MOS1 band 5 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_5_Rate_Error
1-sigma uncertainty in MOS1 band 5 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_Rate
The total (over all energy bands) MOS2 count rate. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_Rate_Error
1-sigma uncertainty in the total MOS2 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_1_Rate
The MOS2 band 1 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_1_Rate_Error
1-sigma uncertainty in MOS2 band 1 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_2_Rate
The MOS2 band 2 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_2_Rate_Error
1-sigma uncertainty in MOS2 band 2 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_3_Rate
The MOS2 band 3 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_3_Rate_Error
1-sigma uncertainty in MOS2 band 3 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_4_Rate
The MOS2 band 4 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_4_Rate_Error
1-sigma uncertainty in MOS2 band 4 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_5_Rate
The MOS2 band 5 count rate, fitted per image. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_5_Rate_Error
1-sigma uncertainty in MOS2 band 5 count rate. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_Cts
The all-EPIC background-subtracted source counts in the entire PSF. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_Cts_Error
1-sigma uncertainty in the all-EPIC count number. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_Cts
The total (over all energy bands) PN background-subtracted source counts in the entire PSF. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

PN_Cts_Error
1-sigma uncertainty in the total (over all energy bands) PN count number. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_Cts
The total MOS1 background-subtracted source counts in the entire PSF. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M1_Cts_Error
1-sigma uncertainty in the total MOS1 count number. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_Cts
The total MOS2 background-subtracted source counts in the entire PSF. A zero value with a non-zero error refers to case where no counts are detected in spite of sufficient PSF coverage. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

M2_Cts_Error
1-sigma uncertainty in the total MOS2 count number. A null value means that the exposure is zero or the covered PSF fraction is below 15%.

EP_Det_ML
The total EPIC equivalent maximum detection likelihood, normalized to two degrees of freedom. This is calculated from all the valid contributing images for which the source is inside the detection mask.

PN_Det_ML
The total PN equivalent maximum detection likelihood, normalized to two degrees of freedom. This is calculated from all the valid contributing images for which the source is inside the detection mask for the PN instrument.

PN_1_Det_ML
The equivalent maximum detection likelihood for PN band 1, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

PN_2_Det_ML
The equivalent maximum detection likelihood for PN band 2, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

PN_3_Det_ML
The equivalent maximum detection likelihood for PN band 3, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

PN_4_Det_ML
The equivalent maximum detection likelihood for PN band 4, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

PN_5_Det_ML
The equivalent maximum detection likelihood for PN band 5, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M1_Det_ML
The total MOS1 equivalent maximum detection likelihood, normalized to two degrees of freedom. This is calculated from all the valid contributing images for which the source is inside the detection mask for the MOS1 instrument.

M1_1_Det_ML
The equivalent maximum detection likelihood for MOS1 band 1, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M1_2_Det_ML
The equivalent maximum detection likelihood for MOS1 band 2, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M1_3_Det_ML
The equivalent maximum detection likelihood for MOS1 band 3, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M1_4_Det_ML
The equivalent maximum detection likelihood for MOS1 band 4, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M1_5_Det_ML
The equivalent maximum detection likelihood for MOS1 band 5, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M2_Det_ML
The total MOS2 equivalent maximum detection likelihood, normalized to two degrees of freedom. This is calculated from all the valid contributing images for which the source is inside the detection mask for the MOS2 instrument.

M2_1_Det_ML
The equivalent maximum detection likelihood for MOS2 band 1, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M2_2_Det_ML
The equivalent maximum detection likelihood for MOS2 band 2, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M2_3_Det_ML
The equivalent maximum detection likelihood for MOS2 band 3, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M2_4_Det_ML
The equivalent maximum detection likelihood for MOS2 band 4, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

M2_5_Det_ML
The equivalent maximum detection likelihood for MOS2 band 5, normalized to two degrees of freedom. This is calculated for the individual image if the source is inside the detection mask.

Extent
The source extent radius, in arcseconds, derived from the model source PSF convolved with a Beta profile. Below an extent of 6 arcsec, the source is considered unresolved and set to zero and the source is "point-like".

Extent_Error
1-sigma uncertainty in the source extent radius, in arcseconds. This is set to "Null", if the extent is below 6 arcsec.

Extent_ML
The likelihood that the source is extended with radius EXTENT. This is set to "Null" for a point-like source, i.e., if the extent is below 6 arcsec.

EP_HR1
Equivalent all-EPIC hardness ratio 1 (HR1). This is based on the mean of all active instruments. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

EP_HR1_Error
1-sigma uncertainty in the all-EPIC hardness ratio 1.

EP_HR2
Equivalent all-EPIC hardness ratio 2 (HR2). This is based on the mean of all active instruments. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

EP_HR2_Error
1-sigma uncertainty in the all-EPIC hardness ratio 2.

EP_HR3
Equivalent all-EPIC hardness ratio 3 (HR3). This is based on the mean of all active instruments. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

EP_HR3_Error
1-sigma uncertainty in the all-EPIC hardness ratio 3.

EP_HR4
Equivalent all-EPIC hardness ratio 4 (HR4). This is based on the mean of all active instruments. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

EP_HR4_Error
1-sigma uncertainty in the all-EPIC hardness ratio 4.

PN_HR1
PN hardness ratio 1 (HR1) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

PN_HR1_Error
1-sigma uncertainty in PN hardness ratio 1.

PN_HR2
PN hardness ratio 2 (HR2) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

PN_HR2_Error
1-sigma uncertainty in PN hardness ratio 2.

PN_HR3
PN hardness ratio 3 (HR3) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

PN_HR3_Error
1-sigma uncertainty in PN hardness ratio 3.

PN_HR4
PN hardness ratio 4 (HR4) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

PN_HR4_Error
1-sigma uncertainty in PN hardness ratio 4.

M1_HR1
MOS1 hardness ratio 1 (HR1) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M1_HR1_Error
1-sigma uncertainty in MOS1 hardness ratio 1.

M1_HR2
MOS1 hardness ratio 2 (HR2) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M1_HR2_Error
1-sigma uncertainty in MOS1 hardness ratio 2.

M1_HR3
MOS1 hardness ratio 3 (HR3) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M1_HR3_Error
1-sigma uncertainty in MOS1 hardness ratio 3.

M1_HR4
MOS1 hardness ratio 4 (HR4) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M1_HR4_Error
1-sigma uncertainty in MOS1 hardness ratio 4.

M2_HR1
MOS2 hardness ratio 1 (HR1) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M2_HR1_Error
1-sigma uncertainty in MOS2 hardness ratio 1.

M2_HR2
MOS2 hardness ratio 2 (HR2) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M2_HR2_Error
1-sigma uncertainty in MOS2 hardness ratio 2.

M2_HR3
MOS2 hardness ratio 3 (HR3) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M2_HR3_Error
1-sigma uncertainty in MOS2 hardness ratio 3.

M2_HR4
MOS2 hardness ratio 4 (HR4) for the individual image. The hardness ratio is defined as the ratio of the two bands, H and S, as:

      HR=(H-S)/(H+S)

      HR1: bands 2 and 1
      HR2: bands 3 and 2
      HR3: bands 4 and 3
      HR4: bands 5 and 4

M2_HR4_Error
1-sigma uncertainty in MOS2 hardness ratio 4.

PN_Exposure
The total PN exposure map values (including vignetting effects and PSF-weighted) summed for all contributing images.

PN_1_Exposure
The total PN band 1 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

PN_2_Exposure
The total PN band 2 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

PN_3_Exposure
The total PN band 3 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

PN_4_Exposure
The total PN band 4 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

PN_5_Exposure
The total PN band 5 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M1_Exposure
The total MOS1 exposure map values (including vignetting effects and PSF-weighted) summed for all contributing images.

M1_1_Exposure
The total MOS1 band 1 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M1_2_Exposure
The total MOS1 band 2 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M1_3_Exposure
The total MOS1 band 3 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M1_4_Exposure
The total MOS1 band 4 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M1_5_Exposure
The total MOS1 band 5 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M2_Exposure
The total MOS2 exposure map values (including vignetting effects and PSF-weighted) summed for all contributing images.

M2_1_Exposure
The total MOS2 band 1 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M2_2_Exposure
The total MOS2 band 2 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M2_3_Exposure
The total MOS2 band 3 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M2_4_Exposure
The total MOS2 band 4 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

M2_5_Exposure
The total MOS2 band 5 exposure map values (including vignetting effects and PSF-weighted) for each individual image.

PN_Bg
The total PN background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

PN_1_Bg
PN band 1 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

PN_2_Bg
PN band 2 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

PN_3_Bg
PN band 3 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

PN_4_Bg
PN band 4 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

PN_5_Bg
PN band 5 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M1_Bg
The total MOS1 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M1_1_Bg
The MOS1 band 1 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M1_2_Bg
The MOS1 band 2 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M1_3_Bg
The MOS1 band 3 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M1_4_Bg
The MOS1 band 4 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M1_5_Bg
The MOS1 band 5 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M2_Bg
The total MOS2 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M2_1_Bg
The MOS2 band 1 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M2_2_Bg
The MOS2 band 2 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M2_3_Bg
The MOS2 band 3 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M2_4_Bg
The MOS2 band 4 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

M2_5_Bg
The MOS2 band 5 background model at the central position of the source on the CCD summed for all contributing images. This is set to "Null" if the exposure map is zero and if the center of the source is located on a bad chip area.

EP_Ontime
The total all-EPIC good exposure time, in seconds, at the central position of the source on the CCD. This is the maximum of the good exposure time per instrument and set to zero if the center of the source is located on a bad chip area.

PN_Ontime
The total PN good exposure time, in seconds, at the central position of the source. The times are calculated by the SAS task evselect and are not vignetting corrected. This is read from the header of the individual observation file and set to zero if the center of the source is location on a bad chip area.

M1_Ontime
The total MOS1 good exposure time, in seconds, at the central position of the source. The times are calculated by the SAS task evselect and are not vignetting corrected. This is read from the header of the individual observation file and set to zero if the center of the source is location on a bad chip area.

M2_Ontime
The total MOS2 good exposure time, in seconds, at the central position of the source. The times are calculated by the SAS task evselect and are not vignetting corrected. This is read from the header of the individual observation file and set to zero if the center of the source is location on a bad chip area.

PN_Pileup
The estimate of the pile-up level in EPIC/pn. A value below 1 corresponds to negligible pile-up (less than a few % flux loss) while values larger than 10 denote heavy pile-up.

M1_Pileup
The estimate of the pile-up level in EPIC/MOS1. A value below 1 corresponds to negligible pile-up (less than a few % flux loss) while values larger than 10 denote heavy pile-up.

M2_Pileup
The estimate of the pile-up level in EPIC/MOS2. A value below 1 corresponds to negligible pile-up (less than a few % flux loss) while values larger than 10 denote heavy pile-up.

PN_Maskfrac
The PSF-weighted chip coverage in the PN detection mask. This is the minimum of the slightly differing values per energy band.

M1_Maskfrac
The PSF-weighted chip coverage in the MOS1 detection mask. This is the minimum of the slightly differing values per energy band.

M2_Maskfrac
The PSF-weighted chip coverage in the MOS2 detection mask. This is the minimum of the slightly differing values per energy band.

Dist_Ref
The distance to the reference coordinates of the field, in arcminutes.

EP_Offax
The angular distance of the source in the all-EPIC energy range to the telescope boresight, in arcmin. This is the minimum of the values per instrument.

PN_Offax
The angular distance of the source to the telescope boresight in PN, in arcmin, based on a combined fit.

M1_Offax
The angular distance of the source to the telescope boresight in MOS1, in arcmin, based on a combined fit.

M2_Offax
The angular distance of the source to the telescope boresight in MOS2, in arcmin, based on a combined fit.

PN_1_Vig
The PN vignetting factor at the central position of the source in energy band 1, based on the calibration database.

PN_2_Vig
The PN vignetting factor at the central position of the source in energy band 2, based on the calibration database.

PN_3_Vig
The PN vignetting factor at the central position of the source in energy band 3, based on the calibration database.

PN_4_Vig
The PN vignetting factor at the central position of the source in energy band 4, based on the calibration database.

PN_5_Vig
The PN vignetting factor at the central position of the source in energy band 5, based on the calibration database.

M1_1_Vig
The MOS1 vignetting factor at the central position of the source in energy band 1, based on the calibration database.

M1_2_Vig
The MOS1 vignetting factor at the central position of the source in energy band 2, based on the calibration database.

M1_3_Vig
The MOS1 vignetting factor at the central position of the source in energy band 3, based on the calibration database.

M1_4_Vig
The MOS1 vignetting factor at the central position of the source in energy band 4, based on the calibration database.

M1_5_Vig
The MOS1 vignetting factor at the central position of the source in energy band 5, based on the calibration database.

M2_1_Vig
The MOS2 vignetting factor at the central position of the source in energy band 1, based on the calibration database.

M2_2_Vig
The MOS2 vignetting factor at the central position of the source in energy band 2, based on the calibration database.

M2_3_Vig
The MOS2 vignetting factor at the central position of the source in energy band 3, based on the calibration database.

M2_4_Vig
The MOS2 vignetting factor at the central position of the source in energy band 4, based on the calibration database.

M2_5_Vig
The MOS2 vignetting factor at the central position of the source in energy band 5, based on the calibration database.

Overlap_Flag
A flag which indicates whether or not the source is located in an area in which several observations overlap.

Sdetqual_Flag
A flag which indicates whether or not the source was detected in a (chip) region of reasonable detection quality ("T" for true) or of poor quality ("F" for false).

Stack_Flag
The summarized numeric quality flag of the detection, as follows:

      -1 = same as 1
       0 = all flags are false
       1 = at least one of the flags 1, 2, 3, 9 is true
       2 = at least one of the flags 4-8 is true, potentially a spurious source
      10 = no automatic flag but marked as probably spurious based on visual screening
      11 = at least one of the flags 1, 2, 3, 9 is true, based on automated flag, and was also marked as probably spurious based on visual screening
      12 = at least one of the flags 4-8 is true, based on automated flag, and was also marked as probably spurious based on visual screening

      For more details about the quality flags, refer to Section 7.3 in Watson
      et al. (2009, A&A, 493, 339).

EP_Flag
The quality flags of the EPIC detection, combined into a 10-character string (refer to Watson et al., 2009, A&A, 493, 339). This used the worst flag of all instruments. A "true" flag means a warning on the detection condition.

PN_Flag
The quality flags of the PN instrument, combined into a 9-character string (refer to Watson et al., 2009, A&A, 493, 339), for the individual image. A "true" flag means a warning on the detection condition.

M1_Flag
The quality flags of the MOS1 instrument, combined into a 9-character string (refer to Watson et al., 2009, A&A, 493, 339), for the individual image. A "true" flag means a warning on the detection condition.

M2_Flag
The quality flags of the MOS2 instrument, combined into a 9-character string (refer to Watson et al., 2009, A&A, 493, 339), for the individual image. A "true" flag means a warning on the detection condition.

Chi2prob_Detcat
The EPIC chi2 probability for constant flux of nearest 4XMM-DR13 source.

Fvar_Detcat
The fractional intra-observation excess variance of the nearest source in 4XMM-DR13 using the instrument with minimum CHI2PROB.

Var_Flag_Detcat
The variability flag of the nearest unique source in 4XMM-DR13 using the observation with minimum CHI2PROB. If at least one exposure has CHI2PROB below 10-5, then the flag is set to "true."

Sum_Flag_Detcat
The mean source summary quality flag for the nearest unique source in 4XMM-DR13, based on automatic and visual screening.

Time
The start date/time of the observation, provided as the modified Julian Date JD-2400000.5, read from the header of the input file.

End_Time
The end date/time of the last contributing observation, provided as the modified Julian Date JD-2400000.5, read from the header of the input file.

XMM_Revolution
The XMM-Newton orbit of the observation, read from the header of the input file.

PA_Pnt
The mean position angle, in degrees, of the spacecraft, based on the file header.

Obs_Class
The observation quality from the 4XMM-DR13 screening.

PN_Submode
The PN observing mode, based on the file header.

M1_Submode
The MOS1 observing mode, based on the file header.

M2_Submode
The MOS2 observing mode, based on the file header.

PN_Filter
The PN filter mode used for this observation, based on the file header.

M1_Filter
The MOS1 filter mode used for this observation, based on the file header.

M2_Filter
The MOS2 filter mode used for this observation, based on the file header.

Astcorr_Flag
A flag which indicates that the observation was astrometrically corrected.

CC_RA_Offset
The catcorr shift of the right ascension in the field, in arcseconds.

CC_RA_Offset_Error
The 1-sigma uncertainty in the catcorr shift of the right ascension in the field, in arcseconds.

CC_Dec_Offset
The catcorr shift of the declination in the field, in arcseconds.

CC_Dec_Offset_Error
The 1-sigma uncertainty in the catcorr shift of the declination in the field, in arcseconds.

CC_Rot_Corr
The catcorr shift of the position angle in the field, in degrees.

CC_Rot_Corr_Error
The 1-sigma uncertainty in the catcorr shift of the position angle in the field, in degrees.

CC_Pos_Offset
The catcorr total position shift of the field, in arcseconds.

CC_Pos_Offset_Error
The 1-sigma uncertainty in the catcorr total position shift of the field, in arcseconds.

CC_Refcat
The catcorr reference catalog.

CC_Nmatches
The catcorr number of usable matches with the reference catalog.

PN_Bkg_Crarea
The EPIC/pn background rate per area, in ct/s/arcsec2.

M1_Bkg_Crarea
The EPIC/MOS1 background rate per area, in ct/s/arcsec2.

M2_Bkg_Crarea
The EPIC/MOS2 background rate per area, in ct/s/arcsec2.

PN_Bkg_Cprob
The EPIC/pn Cauchy probability derived from PN_BKG_CRAREA.

M1_Bkg_Cprob
The EPIC/MOS1 Cauchy probability derived from M1_BKG_CRAREA.

M2_Bkg_Cprob
The EPIC/MOS2 Cauchy probability derived from M2_BKG_CRAREA.

URL_Detcat
This contains the URL of the web page with more information on the nearest unique source in 4XMM-DR13.


Contact Person

Questions regarding the XMMSTACKOB database table can be addressed to the HEASARC Help Desk.
Page Author: Browse Software Development Team
Last Modified: Friday, 08-Dec-2023 14:01:20 EST