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NGC6231XMM - NGC 6231 XMM-Newton X-Ray Source Catalog

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Overview

This table contains the results of an X-ray campaign towards the young open cluster NGC 6231. The XMM-Newton observations, of a total duration of ~ 180 ks, reveal that NGC 6231 is very rich in the X-ray domain too. Indeed, 610 X-ray sources were detected in the present field of view, centered on the colliding wind binary HD 152248 in the cluster core (RA, Dec J2000.0 of 16 54 10.06, -41 49 30.1). The limiting sensitivity of this survey is approximately 6 x 10^-15^erg/s/cm^2 but clearly depends on the location in the field of view and on the source spectrum. Using different existing catalogs, over 85% of the X-ray sources could be associated with at least one optical and/or infrared counterpart within a limited cross-correlation radius of 2.5 or 3-arcsec according to the optical/IR catalog used. The surface density distribution of the X-ray sources presents a slight N-S elongation. Once corrected for the spatial sensitivity variation of the EPIC instruments, the radial profile of the source surface density is well described by a King profile with a central density of about 8 sources per arcmin^2 and a core radius close to 3.1 arcminutes. The distribution of the X-ray sources seems closely related to the optical source distribution. The expected number of foreground and background sources should represent about 9% of the detected sources, thus strongly suggesting that most of the observed X-ray emitters are physically belonging to NGC 6231. Finally, beside a few bright but soft objects -- corresponding to the early-type stars of the cluster -- most of the sources are relatively faint (~5 x 10^-15 erg/s/cm^2) with an energy distribution peaked around 1.0 - 2.0 keV.

The catalog of the 610 X-ray sources detected in the 30'-diameter field of view of XMM-Newton is presented here, including the equatorial coordinates, logarithmic likelihoods and count rates for the three EPIC instruments and for various energy ranges, as well as the cross-identification of the X-ray sources with various optical/infrared catalogs (2MASS, GSC2.2, USNO B1.0, SSB06) and their most commonly used names (HD/HDE, CD, CPD, Segg., SBL98, Braes), with only the closest identifications being reported here.


Catalog Bibcode

2006A&A...454.1047S

References

An XMM-Newton view of the NGC 6231 young open cluster: I. The catalogue.
     Sana H., Gosset E., Rauw G., Sung H., Vreux J.-M.
    <Astron. Astrophys. 454, 1047 (2006)>
    =2006A&A...454.1047S

Provenance

This table was created by the HEASARC in March 2007 based on CDS catalog J/A+A/454/1047 files table3.dat and table6.dat.

Parameters

Source_Number
A running X-ray source number in order of increasing J2000.0 Right Ascension.

Alt_Name
An alternative name for the X-ray source using the '[SGR2006]' prefix (for Sana, Gosset and Rauw, 2006) and the source number, as recommended by the CDS Dictionary of Nomenclature of Celestial Objects.

Name
The name for the X-ray source as given in the paper, using the 'XMMU' prefix and the (rounded, not truncated) J2000.0 coordinates (JHHMMSS.s-DDMMSS).

Error_Radius
The positional uncertainty of the X-ray source location, in arcseconds.

PN_Likelihood
The equivalent logarithmic likelihood L2 of the X-ray source in the pn (see Section 4.1 and Appendix B of the reference paper for more details).

PN_Count_Rate
The pn count rate for the X-ray source in the total-energy band (0.5 - 10.0 keV), in ct/s.

PN_Count_Rate_Error
The uncertainty in the pn count rate for the X-ray source in the total-energy band, in ct/s.

PN_SB_Count_Rate
The pn count rate for the X-ray source in the soft-energy band (0.5 - 1.0 keV), in ct/s.

PN_SB_Count_Rate_Error
The uncertainty in the pn count rate for the X-ray source in the soft-energy band, in ct/s.

PN_MB_Count_Rate
The pn count rate for the X-ray source in the medium-energy band (1.0 - 2.5 keV), in ct/s.

PN_MB_Count_Rate_Error
The uncertainty in the pn count rate for the X-ray source in the medium-energy band, in ct/s.

PN_HB_Count_Rate
The pn count rate for the X-ray source in the hard-energy band (2.5 - 10.0 keV), in ct/s.

PN_HB_Count_Rate_Error
The uncertainty in the pn count rate for the X-ray source in the hard-energy band, in ct/s.

PN_HR1
The first hardness ratio HR1 defined by HR1 = (M-S)/(M+S), where M and S are the medium-band and soft-band counts as measured by the pn for the X-ray source, respectively.

PN_HR1_Error
The uncertainty in the first hardness ratio measured by the pn for the X-ray source.

PN_HR2
The second hardness ratio HR2 defined by HR2 = (H-M)(H+M), where H and M are the hard-band and medium-band counts as measured by the pn for the X-ray source, respectively.

PN_HR2_Error
The uncertainty in the second hardness ratio measured by the pn for the X-ray source.

M1_Likelihood
The equivalent logarithmic likelihood L2 of the X-ray source in the MOS1 (see Section 4.1 and Appendix B of the reference paper for more details).

M1_Count_Rate
The MOS1 count rate for the X-ray source in the total-energy band (0.5 - 10.0 keV), in ct/s.

M1_Count_Rate_Error
The uncertainty in the MOS1 count rate for the X-ray source in the total-energy band, in ct/s

M1_SB_Count_Rate
The MOS1 count rate for the X-ray source in the soft-energy band (0.5 - 1.0 keV), in ct/s

M1_SB_Count_Rate_Error
The uncertainty in the MOS1 count rate for the X-ray source in the soft-energy band, in ct/s.

M1_MB_Count_Rate
The MOS1 count rate for the X-ray source in the medium-energy band (1.0 - 2.5 keV), in ct/s.

M1_MB_Count_Rate_Error
The uncertainty in the MOS1 count rate for the X-ray source in the medium-energy band, in ct/s.

M1_HB_Count_Rate
The MOS1 count rate for the X-ray source in the hard-energy band (2.5 - 10.0 keV), in ct/s.

M1_HB_Count_Rate_Error
The uncertainty in the MOS1 count rate for the X-ray source in the hard-energy band, in ct/s.

M1_HR1
The first hardness ratio HR1 defined by HR1 = (M-S)/(M+S), where M and S are the medium-band and soft-band counts as measured by the MOS1 for the X-ray source, respectively.

M1_HR1_Error
The uncertainty in the first hardness ratio measured by the MOS1 for the X-ray source.

M1_HR2
The second hardness ratio HR2 defined by HR2 = (H-M)(H+M), where H and M are the hard-band and medium-band counts as measured by the MOS1 for the X-ray source, respectively.

M1_HR2_Error
The uncertainty in the second hardness ratio measured by the MOS1 for the X-ray source.

M2_Likelihood
The equivalent logarithmic likelihood L2 of the X-ray source in the MOS2 (see Section 4.1 and Appendix B of the reference paper for more details).

M2_Count_Rate
The MOS2 count rate for the X-ray source in the total-energy band (0.5 - 10.0 keV), in ct/s.

M2_Count_Rate_Error
The uncertainty in the MOS2 count rate for the X-ray source in the total-energy band, in ct/s.

M2_SB_Count_Rate
The MOS2 count rate for the X-ray source in the soft-energy band (0.5 - 1.0 keV), in ct/s.

M2_SB_Count_Rate_Error
The uncertainty in the MOS2 count rate for the X-ray source in the soft-energy band, in ct/s.

M2_MB_Count_Rate
The MOS2 count rate for the X-ray source in the medium-energy band (1.0 - 2.5 keV), in ct/s.

M2_MB_Count_Rate_Error
The uncertainty in the MOS2 count rate for the X-ray source in the medium-energy band, in ct/s.

M2_HB_Count_Rate
The MOS2 count rate for the X-ray source in the hard-energy band (2.5 - 10.0 keV), in ct/s.

M2_HB_Count_Rate_Error
The uncertainty in the MOS2 count rate for the X-ray source in the hard-energy band, in ct/s.

M2_HR1
The first hardness ratio HR1 defined by HR1 = (M-S)/(M+S), where M and S are the medium-band and soft-band counts as measured by the MOS2 for the X-ray source, respectively.

M2_HR1_Error
The uncertainty in the first hardness ratio measured by the MOS2 for the X-ray source.

M2_HR2
The second hardness ratio HR2 defined by HR2 = (H-M)(H+M), where H and M are the medium-band and soft-band counts as measured by the MOS2 for the X-ray source, respectively.

M2_HR2_Errorr
The uncertainty in the second hardness ratio measured by the MOS2 for the X-ray source.

Epic_Likelihood
The total equivalent logarithmic likelihood L2_EPIC that was compared to the adopted detection limit (see Table 2 of the reference paper for the specific values of the latter) according to the combination of instruments used (given in the instruments_used parameter).

Instruments_Used
The combination of instruments used to calculate the value of the total equivalent logarithmic likelihood L2_EPIC:

   m1   = MOS1
   m2   = MOS2
   mos  = MOS1 + MOS2
   pn   = pn
   m1pn = MOS1 + pn
   m2pn = MOS2 + pn
   epic = MOS1 + MOS2 + pn
  

Extent_Flag
This flag parameter is set to 'ext' for those sources for which the fit was improved by using an extended PSF model. The results using the emldetect extended-fit analysis on these sources are given in Table 4 of the reference paper.

Comments
This parameter contains warnings for some sources, e.g, those for which no instrument combination was found to be far enough from gaps, instrument edges, or bad detector columns.

RA
The Right Ascension of the X-ray source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.01 seconds of time in the original table. In order to avoid systematic shifts, the coordinates were rounded, not truncated.

Dec
The Declination of the X-ray source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.1 arcseconds in the original table. In order to avoid systematic shifts, the coordinates were rounded, not truncated.

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

Offset_2MASS_XMM
The offset between the position of the X-ray source and its closest counterpart in the 2MASS Catalog, in arcseconds.

TwoMASS_Name
The 2MASS (CDS Cat. <II/246>) designation for the counterpart.

Jmag
The 2MASS J magnitude of the counterpart.

Hmag
The 2MASS H magnitude of the counterpart.

Kmag
The 2MASS K magnitude of the counterpart.

Offset_Gsc2p2_XMM
The offset between the position of the X-ray source and its closest counterpart in the GSC2.2 Catalog, in arcseconds.

Gsc2p2_Name
The GSC2.2 (CDS Cat. <I/271>) designation for the counterpart.

Rmag
The GSC2.2 R magnitude of the counterpart

Bmag
The GSC2.2 B magnitude of the counterpart.

Vmag
The GSC2.2 V magnitude of the counterpart.

Offset_Usnob1_XMM
The offset between the position of the X-ray source and its closest counterpart in the USNO B1.0 Catalog, in arcseconds.

Usnob1_Name
The USNO B1.0 (CDS Cat. <I/284>) designation for the counterpart.

R1_Mag
The USNO B1.0 R1 magnitude of the counterpart.

B1_Mag
The USNO B1.0 B1 magnitude of the counterpart.

R2_Mag
The USNO B1.0 R2 magnitude of the counterpart.

B2_Mag
The USNO B1.0 B2 magnitude of the counterpart.

Imag
The USNO B1.0 I magnitude of the counterpart.

Offset_Ssb06_XMM
The offset between the position of the X-ray source and its closest counterpart with V < 20 in the SSB06 (Sung et al., 2006, in prep.) source list, in arcseconds.

Ssb06_Flag
This flag parameter is set to 'S' to indicate that the referenced star is saturated in the SSB06 Data, and that the data are taken from SBL98 (Sung, Bessell and Lee 1998, AJ, 115, 734) instead.

Ssb06_Number
The SSB06 (Sung et al., 2006, in prep.) source number.

Vmag_Ssb06
The SSB06 V magnitude of the counterpart.

VI_Color
The SSB06 V-I color of the counterpart.

BV_Color
The SSB06 B-V Color of the counterpart.

UB_Color
The SSB06 U-B Color of the counterpart.

HD_Number
The HD/HDE Number of the counterpart

CD_M41number
The CD Number NNNNN of the counterpart (where the full name is CD-41 NNNNN).

CD_Multiplicity_Index
This flag parameter is set to 'p' to indicate the presence of a multiplicity index for the CD counterpart.

CPD_M41number
The CPD Number NNNN of the counterpart (where the full name is CPD-41 NNNN).

Segg_Number
The Seggewiss (1968VeBon..79....1S) number NNN of the counterpart (where the full name is 'NGC 6231 NNN' in SIMBAD).

Sbl98_Number
The Sung et al. (1998, CDS Cat.<J/AJ/115/734>) number NNN (where the full name is 'Cl* NGC 6231 SBL NNN' in SIMBAD).

Braes_Number
The Braes (1967, Bull. Astron. Inst. Netherlands Suppl., 2, 1) number of the counterpart.


Contact Person

Questions regarding the NGC6231XMM database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 9-Mar-2007