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ELAISS1XMM - ELAIS S1 Field XMM-Newton X-Ray Source Catalog

HEASARC
Archive

Overview

The formation and evolution of cosmic structures can be probed by studying the evolution of the luminosity function of the Active Galactic Nuclei (AGNs), galaxies and clusters of galaxies and of the clustering of the X-ray active Universe, compared to the IR-UV active Universe. To this purpose, the authors have surveyed with XMM-Newton the central ~0.6 deg^2 region of the ELAIS-S1 field down to flux limits of ~5.5 x 10^-16 erg cm^-2 s^-1 (0.5-2 keV, soft band, S), ~2 x 10^-15 erg cm^-2 s^-1 (2-10 keV, hard band, H), and ~4 x 10^-15 erg cm^-2 s^-1 (5-10 keV, ultra-hard band, HH). They present here the analysis of the XMM-Newton observations, the number counts in different energy bands and the clustering properties of the X-ray sources. They have detected a total of 478 sources, 395 and 205 of which detected in the S and H bands respectively. They identified 7 clearly extended sources and estimated their redshift through X-ray spectral fits with thermal models. In four cases the redshift is consistent with z = 0.4, so they may have detected a large scale structure formed by groups and clusters of galaxies through their hot intra-cluster gas emission. The relative density of the S band sources is higher near the clusters and groups at z ~ 0.4 and extends toward East and the South/West. This suggests that the structure is complex, with a size comparable to the full XMM-Newton field. Conversely, the highest relative source densities of the H band sources are located in the central-west region of the field.

The mosaic of four partially overlapping deep XMM-Newton pointings covers a large (~0.6 deg^2) and contiguous area of the ELAIS-S1 region. The pointings are named

    ELAIS-S1-A (RA=8.91912, DE=-43.31344, J2000),
    ELAIS-S1-B (RA=8.92154, DE=-43.65575, J2000),
    ELAIS-S1-C (RA=8.42195, DE=-43.30488, J2000) and
    ELAIS-S1-D (RA=8.42375, DE=-43.65327, J2000).
The X-ray observations were performed on May 2003 through July 2003 with XMM-Newton's European Photon Imaging Camera (EPIC) and two MOS-CCD cameras.

Catalog Bibcode

2006A&A...457..501P

References

The XMM-Newton survey of the ELAIS-S1 field.
I. Number counts, angular correlation function and X-ray spectral properties.
    Puccetti S., Fiore F., D'Elia V., Pillitteri I., Feruglio C., Grazian A.,
    Brusa M., Ciliegi P., Comastri A., Gruppioni C., Mignoli M., Vignali C.,
    Zamorani G., La Franca F., Sacchi N., Franceschini A., Berta S.,
    Buttery H., Dias J.E.
   <Astron. Astrophys., 457, 501-515 (2006)>
   =2006A&A...457..501P

Provenance

This table was created by the HEASARC in June 2008 based on the CDS Catalog J/A+A/457/501 files elaisxmm.dat and catalog.dat.

Parameters

Source_Number
A unique identification number for each X-ray source in the catalog, in order of increasing J2000.0 Right Ascension.

Name
The name for the X-ray source using the 'XMMES1' prefix (for XMM-Newton ELAIS S1 field) and the value of the source number parameter, as registered with the CDS Dictionary of Nomenclature of Celestial Objects, e.g., 'XMMES1 5'.

RA
The Right Ascension of the XMM-Newton X-ray source centroid in the selected equinox. The RA was given in J2000.0 decimal degree coordinates to a precision of 10^-5 degrees (0.036 arcseconds) in the original table.

Dec
The Declination of the XMM-Newton X-ray source centroid in the selected equinox. The Declination was given in J2000.0 decimal degree coordinates to a precision of 10^-5 degrees (0.036 arcseconds) in the original table.

LII
The Galactic Longitude of the XMM-Newton X-ray source.

BII
The Galactic Latitude of the XMM-Newton X-ray source.

Error_Radius
The RMS uncertainty in the centroid of the X-ray source position, in arcseconds.

X_Pixel
The X-position of the XMM-Newton source, in pixels.

Y_Pixel
The Y-position of the XMM-Newton source, in pixels.

Off_Axis
The off-axis angle of the X-ray source, in arcminutes.

Scr_Area
The SCR area binary number.

Significance
The detection significance of the XMM-Newton source.

Bck_Counts
The background counts in the X-ray source extraction region.

Count_Rate
The full-band (0.5-10 keV) background-subtracted count rate of the XMM-Newton X-ray source, in ct/s. The exposure times used to calculate the count rates were obtained from the corresponding exposure maps, and thus take into account all spatial non-uniformities due to vignetting, chip geometry, and CCD gaps.

Count_Rate_Error
The RMS uncertainty in the associated count rate, in ct/s.

Exposure
The exposure time, in seconds (s), at the position of the X-ray source.

Size
The angular size of the XMM-Newton X-ray source, (believed to be) in arcseconds.

Extent_Likelihood
The likelihood that the XMM-Newton X-ray source is extended.

HB_Count_Rate
The hard-band (2-10 keV) count rate of the XMM-Newton X-ray source, in ct/s. The exposure times used to calculate the count rates were obtained from the corresponding exposure maps, and thus take into account all spatial non-uniformities due to vignetting, chip geometry, and CCD gaps.

HB_Count_Rate_Error
The RMS uncertainty in the associated count rate, in ct/s.

SB_Count_Rate
The soft-band (0.5-2 keV) count rate of the XMM-Newton X-ray source, in ct/s. The exposure times used to calculate the count rates were obtained from the corresponding exposure maps, and thus take into account all spatial non-uniformities due to vignetting, chip geometry, and CCD gaps.

SB_Count_Rate_Error
The RMS uncertainty in the associated count rate, in ct/s.

UHB_Count_Rate
The ultra-hard-band (5-10 keV) count rate of the XMM-Newton X-ray source, in ct/s. The exposure times used to calculate the count rates were obtained from the corresponding exposure maps, and thus take into account all spatial non-uniformities due to vignetting, chip geometry, and CCD gaps.

UHB_Count_Rate_Error
The RMS uncertainty in the associated count rate, in ct/s.

Flux_Limit
This limit parameter is set to '<' if the associated flux value is an upper limit rather than a detection.

Flux
The full-band (0.5-10 keV) flux of the XMM-Newton X-ray source, in erg/s/cm^2. Full-band count rates were converted into fluxes using a variable conversion factor which is a function of spectral shape, estimated from the hardness ratio (H-S)/(H+S).

Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm^2.

HB_Flux_Limit
This limit parameter is set to '<' if the associated flux value is an upper limit rather than a detection.

HB_Flux
The hard-band (2-10 keV) flux of the XMM-Newton X-ray source, in erg/s/cm^2. Count rates for the soft (S), hard (H)and ultra-hard (HH) bands were converted into fluxes using conversion factors CF which are appropriate for a source with a power-law spectrum with an energy index Alpha_E = 0.8: 1.6 x 10^-12 (S), 8.3 x 10^-12, and 16.5 x 10^-12 erg/cm^2/ct, respectively.

HB_Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm^2

SB_Flux_Limit
This limit parameter is set to '<' if the associated flux value is an upper limit rather than a detection.

SB_Flux
The soft-band (0.5-2 keV) flux of the XMM-Newton X-ray source, in erg/s/cm^2. Count rates for the soft (S), hard (H)and ultra-hard (HH) bands were converted into fluxes using conversion factors CF which are appropriate for a source with a power-law spectrum with an energy index Alpha_E = 0.8: 1.6 x 10^-12 (S), 8.3 x 10^-12, and 16.5 x 10^-12 erg/cm^2/ct, respectively.

SB_Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm^2

UHB_Flux_Limit
This limit parameter is set to '<' if the associated flux value is an upper limit rather than a detection.

UHB_Flux
The ultra-hard-band (5-10 keV) flux of the XMM-Newton X-ray source, in erg/s/cm^2. Count rates for the soft (S), hard (H)and ultra-hard (HH) bands were converted into fluxes using conversion factors CF which are appropriate for a source with a power-law spectrum with an energy index Alpha_E = 0.8: 1.6 x 10^-12 (S), 8.3 x 10^-12, and 16.5 x 10^-12 erg/cm^2/ct, respectively.

UHB_Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm^2

SNR
The signal-to-noise ratio (SNR) of the XMM-Newton X-ray source in the 0.5-10 keV energy band.

HB_SNR
The signal-to-noise ratio (SNR) of the XMM-Newton X-ray source in the 2-10 keV energy band. Sources with 0.5-2 keV and/or 2-10 keV upper limits were detected only in the full 0.5-10 keV band.

SB_SNR
The signal-to-noise ratio (SNR) of the XMM-Newton X-ray source in the 0.5-2 keV energy band. Sources with 0.5-2 keV and/or 2-10 keV upper limits were detected only in the full 0.5-10 keV band.

Chandra_RA_J2000
The Right ascension (J2000) of the Chandra X-ray counterpart to the XMM-Newton source.

Chandra_Dec_J2000
The Declination (J2000) of the Chandra X-ray counterpart to the XMM-Newton source.

Optical_RA_J2000
The Right Ascension (J2000) of the optical counterpart barycenter (either VIMOS or the ESIS WFI).

Optical_Dec_J2000
The Declination (J2000) of the optical counterpart barycenter (either VIMOS or the ESIS WFI).

Optical_Ctrprt_Prob
The probability P(i) that the optical counterpart is associated with the XMM-Newton X-ray source, where P(i)=exp(-(D(X-O)*D(X-O)*N)/10^6^).

Optical_Xray_Offset
The angular distance D(X-O) between the XMM-Newton X-ray and optical sources, in arcseconds.

Rmag
The R-band magnitude of the optical counterpart to the XMM-Newton X-ray source. (Best of MAG_AUTO and MAG_ISOCOR R-band measurements).

Rmag_Error
The RMS uncertainty in the associated magnitude.

Kmag
The isophotal magnitude in the K band of the near-infrared counterpart to the XMM-Newton X-ray source.

Kmag_Error
The RMS uncertainty in the associated magnitude.

Optical_Instrument
The optical instrument used to identify the counterpart to the XMM-Newton X-ray source, being 8.0 for VIMOS or 2.2 for WFI(ESIS).

Spectrum_Number
The running number of the optical spectrum.

Redshift
The optical counterpart redshift z.

Redshift_Flag
This parameter flags the quality of the redshift measurement, as follows:

      2.  = 2 or more emission lines
      1.5 = not specified in the paper
      1.  = based on 1 emission line
      0.5 = tentative redshift
  

Broad_Type
A broad classification code for the counterpart to the X-ray source, as follows:

       -1 = not specified in the paper
        0 = not specified in the paper
        1 = AGN1
        2 = ELG
        3 = GALAXY
        4 = STAR
        5 = AGN2
  

IRAC_RA_J2000
The Right Ascension (J2000) of the barycenter of the IRAC counterpart from the band-merged catalog.

IRAC_Dec_J2000
The Declination (J2000) of the barycenter of the IRAC counterpart from the band-merged catalog.

Flux_3p6_Um
The IRAC aperture/Kron flux density at 3.6 microns of the IR counterpart to the X-ray source, in microJanskies.

Flux_3p6_um_Error
The RMS uncertainty in the associated flux density.

Flux_4p5_Um
The IRAC aperture/Kron flux density at 4.5 microns of the IR counterpart to the X-ray source, in microJanskies.

Flux_4p5_um_Error
The RMS uncertainty in the associated flux density.

Flux_5p8_Um
The IRAC aperture/Kron flux density at 5.8 microns of the IR counterpart to the X-ray source, in microJanskies.

Flux_5p8_um_Error
The RMS uncertainty in the associated flux density.

Flux_8p0_Um
The IRAC aperture/Kron flux density at 8.0 microns of the IR counterpart to the X-ray source, in microJanskies.

Flux_8p0_um_Error
The RMS uncertainty in the associated flux density.

Flux_24_Um
The MIPS aperture/Kron flux density at 24 microns of the IR counterpart to the X-ray source, in microJanskies.

Flux_24_Um_Error
The RMS uncertainty in the associated flux density.

IRAC_Xray_Offset
The angular distance between teh XMM-Newton X-ray and IRAC source detections, in arcseconds.

IRAC_Ctrprt_Prob
The probability that the IRAC counterpart is associated with the XMM-Newton X-ray source.

Class
The HEASARC Browse object classification, based on the value of the broad_type parameter.


Contact Person

Questions regarding the ELAISS1XMM database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 25-Jun-2008