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XMMLSS10KS - XMM-Newton Large-Scale Structure Uniform 10-ksec Exposure X-Ray Source Catalog

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Overview

This table contains some of the X-ray results from the final release of the multiwavelength XMM-Large Scale Structure (LSS) data set, covering the full survey area of 11.1 deg2. The 124 XMM-Newton observations used in the complete XMM-LSS are described in Section 2 and Table 1 of the primary reference paper (Chiappetti et al. 2013, hereafter Paper II). The X-ray data were processed with the latest XMM-LSS XAMIN pipeline version. The catalogs in Paper II supersede the catalog from the first paper in this series (Paper I: Pierre et al. 2007, MNRAS, 382, 279, available at the HEASARC as the XMMLSS table) pertaining to the initial 5 deg2.

The authors provide X-ray source lists in the customary soft and hard energy bands (0.5-2 keV and 2-10 keV, respectively) for a total of 5572 objects in the catalog limited to 10 ks exposures presented in this table, and a total of 6721 objects in the deep full-exposure 2XLSSd catalog (available at the HEASARC as the XMMLSSDEEP table), above a detection likelihood of 15 in at least one band. At the XMMLSS web site which they maintain (http://cosmosdb.iasf-milano.inaf.it/XMM-LSS/), the authors also provide a multiwavelength catalog, cross-correlating their list of X-ray sources with infrared, near-infrared, optical and ultraviolet catalogs. Customary data products, such as X-ray FITS images and thumbnail images from the Canada-France-Hawaii Telescope Legacy Survey and the Spitzer Wide-Area Infrared Extragalactic Survey, are made available there, together with their data base in Milan, which can be queried interactively.

In this table, the authors provide the source list for the full area (11.1 square degrees) of the XMM-LSS, with a total of 5572 point-like or extended sources above a detection likelihood of 15 in either the 0.5-2 or 2-10 keV bands. This table, the "standard" 2XLSS catalog containing the results of the analysis of the survey area using uniform 10-ksec exposures for all pointings longer than 10 ksec, lists the main X-ray parameters, while further multiwavelength parameters and data products (X-ray images and optical/IR thumbnails) are available at the Milan XMM-LSS database site referenced above. It supersedes the first XMM-LSS version (Pierre et al. 2007, available at the HEASARC as the XMMLSS table).

Analogously to Paper I, only sources with an off-axis angle < 13 arcmin were processed by the authors' X-ray data processing pipeline software, XAMIN. The catalog includes all the extended sources classified in the customary C1 and C2 classes (see Section 3.6 of Paper II) plus all point-like sources with a point source detection likelihood (DET_LH) greater than 15 (so-called non-spurious sources).

Catalog Bibcode

2013MNRAS.429.1652C

References

The XMM-Large Scale Structure catalogue.
II. X-ray sources and associated multiwavelength data.
    Chiappetti L., Clerc N., Pacaud F., Pierre M., Gueguen A., Paioro L.,
    Polletta M., Melnyk O., Elyiv A., Surde J., Faccioli L.
    <Mon. Not. R. Astron. Soc. 429, 1652 (2013)>
    =2013MNRAS.429.1652C        (SIMBAD/NED BibCode)
The XMM-LSS catalogue:
X-ray sources and associated optical data. Version I.
    Pierre M., Chiappetti L., Pacaud F., Gueguen A., Libbrecht C., Altieri B.,
    Aussel H., Gandhi P., Garcet O., Gosset E., Paioro L., Ponman T.J.,
    Read A.M., Refregier A., Starck J.-L., Surdej J., Valtchanov I., Adami C.,
    Alloin D., Alshino A., Andreon S., Birkinshaw M., Bremer M., Detal A.,
    Duc P.-A., Galaz G., Jones L., Le Fevre J.-P., Le Fevre O., Maccagni D.,
    Mazure A., Quintana H., Rottgering H.J.A., Sprimont P.-G., Tasse C.,
    Trinchieri G., Willis J.P.
   <Mon. Not. R. Astron. Soc. 382, 279 (2007)>
   =2007MNRAS.382..279P

Provenance

This table was created by the HEASARC in February 2013 based on the CDS catalog J/MNRAS/429/1652 file 2xlss.dat.

Parameters

Source_Number
A unique internal sequence number for each merged X-ray source in the 2XLSS Catalog wherein it is called Xseq.

Name
The preferred catalog X-ray source designation ('2XLSS JHHMMSS.s+DDMMSSa') using the 2XLSS prefix, the 'official', i.e., best-band, J2000.0 position of the X-ray source deduced after the rigid astrometric correction, and (in a very few cases) an a/b suffix. The letter suffix is used when the band merging is ambiguous and one 0.5-2keV band source may have two different hard band counterparts, or vice versa. The naming procedures used for the 2XLSS X-ray sources are extensively discussed in Section 3.5 of the reference paper.

RA
The Right Ascension of the X-ray source in the selected equinox. This is the 'official', i.e., best-band, position of the X-ray source deduced after the rigid astrometric correction. It was given in J2000.0 coordinates to a precision of 10-5 degrees (0.036 arcseconds) in the original table. The X-ray positions were obtained using XAMIN, a maximum-likelihood profile-fitting procedure, using either pnt, a point source PSF, or ext, an extended source model assuming a beta-profile with a constant slope of 2/3, according to the classification of the source in the best band (the extended_source_class parameter).

Dec
The Declination of the X-ray source in the selected equinox. This is the 'official', i.e., best-band, position of the X-ray source deduced after the rigid astrometric correction. It was given in J2000.0 coordinates to a precision of 10-5 degrees (0.036 arcseconds) in the original table. The X-ray positions were obtained using XAMIN, a maximum-likelihood profile-fitting procedure, using either pnt, a point source PSF, or ext, an extended source model assuming a beta-profile with a constant slope of 2/3, according to the classification of the source in the best band (the extended_source_class parameter).

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

SB_Source_Number
A unique internal sequence number for each soft-band (0.5 - 2.0 keV) X-ray source in the 2XLSS Catalog wherein it is called Bseq. If a source is not detected in this band, this field is left blank.

SB_Name
The recommended name for the soft-band X-ray source, using the unofficial prefix '2XLSSB' and the format recommended by the CDS Dictionary of Nomenclature of Celestial Objects for J2000.0 positional-based names, viz., `2XLSSB JHHMMSS.s+DDMMSS'. However, as in Paper I, the coordinates used in the name correspond to the extended (E) or point-like (P) fit in the relevant band Notice that the soft-band names in the 2XLSSd Catalog use the same prefix.

Extended_Source_Class
The soft-band (0.5 - 2.0 keV) source extension classification flag of the X-ray source. This so-called C1/C2 classification flag (discussed in more detail in Section 3.6 of the reference paper II ) is set for candidate clusters according to Pacaud et al. (2006MNRAS.372..578P) and assumes the following values: 

         1 = object classified as C1 cluster candidate in the 0.5 - 2 keV band
         2 = object classified as C2 cluster candidate in the 0.5 - 2 keV band
         0 = undefined in any other case
Extended sources are selected from the XAMIN parameter space as detections with extent > 5 arcsec and likelihood of extent > 15. They are further divided into two classes: C1 with likelihood of extent > 33 and likelihood of detection > 32, which is almost uncontaminated by misclassified point sources, and C2 (the rest), allowing for ~ 50 per cent contamination.

SB_Core_Radius
The core radius of the beta-model derived from ext for the X-ray source in the soft band, in arcseconds. When the extended source fit failed, this parameter is left blank.

SB_Extent_Likelihood
The extension likelihood EXT_LH of the X-ray source in the soft band. When the extended source fit failed, this parameter is left blank.

SB_Detect_Likelihood
The detection likelihood DET_LH of the X-ray source in the soft band. When the extended source fit failed, this parameter is left blank.

SB_Off_Axis
The off-axis angle of the soft-band X-ray source from the nominal field pointing direction, in arcminutes.

SB_RA
The Right Ascension of the X-ray source in the soft band in the selected equinox. This was given in J2000.0 coordinates to a precision of 10-5 degrees (0.036 arcseconds) in the original table.

SB_Dec
The Declination of the X-ray source in the soft band in the selected equinox. This was given in J2000.0 coordinates to a precision of 10-5 degrees (0.036 arcseconds) in the original table.

SB_Error_Radius
The positional error of the X-ray source in the soft (0.5 - 2 keV) band, in arcseconds, computed from the count rate and off-axis angle according to prescriptions given in the reference paper. For extended sources it is set to 0.0

MOS_SB_Rate
The 0.5 - 2 keV MOS count rate of the X-ray source, in ct/s/detector.

PN_SB_Rate
The 0.5 - 2 keV PN count rate of the X-ray source, in ct/s.

SB_Flux
The soft-band (0.5 - 2 keV) flux of the X-ray source, in erg/s/cm2, being the mean of the fluxes derived from the MOS and the PN count rates using the conversion factor given in Table 3 of Paper II. The flux is left blank when undefined for any reason, in particular for all C1 clusters.

SB_Flux_Flag
This flag parameter indicates how the soft-band fluxes computed from the MOS or pn count rates alone differ from the mean flux, with the following coding: 

         0 = difference < 20%
         1 = difference between 20 and 50%
         2 = difference > 50%

HB_Source_Number
A unique internal sequence number for each hard-band (2.- 10 keV) X-ray source in the 2XLSS Catalog wherein it is called CDseq. If a source is not detected in this band, this field is left blank.

HB_Name
The recommended name for the hard-band X-ray source, using the unofficial prefix 2XLSSCD and the format recommended by the CDS Dictionary of Nomenclature of Celestial Objects for J2000.0 positional-based names, viz., `2XLSSCD JHHMMSS.s+DDMMSS'. However, as in Paper I, the coordinates used in the name correspond to the extended (E) or point-like (P) fit in the relevant band. Notice that the soft-band names in the 2XLSSd Catalog use the same prefix.

HB_Core_Radius
The core radius of the beta-model derived from ext for the X-ray source in the hard band, in arcseconds. When the extended source fit failed, this parameter is left blank.

HB_Extent_Likelihood
The extension likelihood EXT_LH of the X-ray source in the hard band. When the extended source fit failed, this parameter is left blank.

HB_Detect_Likelihood
The detection likelihood DET_LH of the X-ray source in the hard band. When the extended source fit failed, this parameter is left blank.

HB_Off_Axis
The off-axis angle of the hard-band X-ray source from the nominal field pointing direction, in arcminutes.

HB_RA
The Right Ascension of the X-ray source in the hard band in the selected equinox. This was given in J2000.0 coordinates to a precision of 10-5 degrees (0.036 arcseconds) in the original table.

HB_Dec
The Declination of the X-ray source in the hard band in the selected equinox. This was given in J2000.0 coordinates to a precision of 10-5 degrees (0.036 arcseconds) in the original table.

HB_Error_Radius
The positional error of the X-ray source in the hard (2 - 10 keV) band, in arcseconds, computed from the count rate and off-axis angle according to prescriptions given in the reference paper. For extended sources it is set to 0.0.

MOS_HB_Rate
The 2 - 10 keV MOS count rate of the X-ray source, in ct/s/detector.

PN_HB_Rate
The 2 - 10 keV PN count rate of the X-ray source, in ct/s.

HB_Flux
The hard-band (2 - 10 keV) flux of the X-ray source, in erg/s/cm2, being the mean of the fluxes derived from the MOS and the PN count rates using the conversion factor given in Table 3 of Paper II. The flux is left blank when undefined for any reason, in particular for all C1 clusters.

HB_Flux_Flag
This flag parameter indicates how the hard-band fluxes computed from the MOS or pn count rates alone differ from the mean flux, with the following coding: 

         0 = difference < 20%
         1 = difference between 20 and 50%
         2 = difference > 50%

Old_Source_Number
The source number (Xseq value) of the corresponding source in the original Version I of the XMM-LSS Catalog; if there is no such counterpart, this is left blank.

Deep_Source_Number
The source number (Xseq value) of the corresponding source in the "Deep" Version of the XMM-LSS Catalog, 2XLSSd; if there is no such counterpart, this is left blank.

Contact Person

Questions regarding the XMMLSS10KS database table can be addressed to the HEASARC Help Desk.
Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:37:11 EDT