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SDSSS82XMM - Sloan Digital Sky Survey Stripe 82 XMM-Newton Source Match Catalog

HEASARC
Archive

Overview

This table contains some of the data from the latest release of the Stripe 82 X-ray (82X) survey point-source catalog, which currently covers 31.3 deg2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6,181 unique X-ray sources are significantly detected with XMM-Newton (> 5 sigma) and Chandra (> 4.5 sigma). This 31 deg2 catalog release includes data from XMM-Newton cycle AO 13, which approximately doubled the Stripe 82X survey area. The flux limits of the Stripe 82X survey are 8.7 x 10-16 erg s-1 cm-2, 4.7 x 10-15 erg s-1 cm-2, and 2.1 x 10-15 erg s-1 cm^=2^ in the soft (0.5 - 2.0 keV), hard (2 - 10 keV), and full (0.5 - 10 keV) bands, respectively, with approximate half-area survey flux limits of 5.4 x 10-15 erg s-1 cm-2, 2.9 x 10-14 erg s-1 cm-2, and 1.7 x 10-14 erg s-1 cm-2, respectively. The authors matched the X-ray source lists to available multi-wavelength catalogs, including updated matches to the previous release of the Stripe 82X survey; 88% of the sample is matched to a multi-wavelength counterpart. Due to the wide area of Stripe 82X and rich ancillary multi-wavelength data, including coadded SDSS photometry, mid-infrared WISE coverage, near-infrared coverage from UKIDSS and VISTA Hemisphere Survey (VHS), ultraviolet coverage from GALEX, radio coverage from FIRST, and far-infrared coverage from Herschel, as well as existing ~30% optical spectroscopic completeness, this study is beginning to uncover rare objects, such as obscured high-luminosity active galactic nuclei at high redshift. The Stripe 82X point source catalog is a valuable data set for constraining how this population grows and evolves, as well as for studying how they interact with the galaxies in which they live. The authors derive the XMM-Newton number counts distribution and compare it with their previously reported Chandra log N - log S relations and other X-ray surveys.

Throughout this study, the authors adopt a cosmology of H0 = 70 km s-1 Mpc-1, OmegaM = 0.27, and Lambda = 0.73.

The XMM-Newton and Chandra X-ray sources were matched with sources in the SDSS, WISE, UKIDSS, VHS, GALEX, FIRST and Herschel databases using the maximum likelihood estimator (MLE) method, as discussed in detail in Section 4 of the reference paper. This table contains the list of 5,220 sources detected in the SDSS Stripe 82 in archival, AO10 and AO13 XMM-Newton observations. A related table SDSSS82CXO contains the list of 1,146 Chandra sources detected in the SDSS Stripe 82.

Compared to the initial version of this catalog based on the 2013 paper, in the current version of the catalog the MLE matching between the XMM-Newton archival and AO10 source lists and ancillary catalogs was updated to include a 1 arcsecond systematic error added in quadrature to the emldetect reported positional error.


Catalog Bibcode

2016ApJ...817..172L

References

The 31 Deg2 release of the Stripe 82 X-ray survey: the point source catalog.
    LaMassa S.M., Urry C.M., Cappelluti N., Bohringer H., Comastri A.,
    Glikman E., Richards G., Ananna T., Brusa M., Cardamone C., Chon G.,
    Civano F., Farrah D., Gilfanov M., Green P., Komossa S., Lira P.,
    Makler M., Marchesi S., Pecoraro R., Ranalli P., Salvato M., Schawinski K.,
    Stern D., Treister E., Viero M.
   <Astrophys. J., 817, 172 (2016)>
   =2016ApJ...817..172L    (SIMBAD/NED BibCode)

Provenance

This table was initially created by the HEASARC in April 2014 based on the machine-readable version of the table ('Properties of SDSS Quasars Detected by XMM-Newton') described in Appendix B2 of the reference paper (LaMassa et al. 2013, MNRAS, 436, 3581) which was obtained from the CDS (catalog J/MNRAS/436/3581/, file xmms82.dat). The present version was created by the HEASARC in January 2017 based on CDS catalog J/ApJ/817/172, files xmmao10.dat and xmmao13.dat.

Parameters

XMM_Sample
This parameter was created by the HEASARC to indicates from which published table/sample the specified entry originates: 10 indicates that the source is from the sample of XMM-Newton sources detected in archival or AO10 observations made as part of the Stripe 82X program (contained in CDS file xmmao10.dat), while 13 indicates that the source is from the sample of XMM-Newton sources detected in AO13 observations made as part of the Stripe 82X program (contained in CDS file xmmao13.dat).

Source_Number
A unique identification number (rec_no) for each XMM-Newton source in this catalog. Sources numbered from 1 to 2,358 are from archival or AO10 observations and have xmm_sample = 10, while sources numbered from 2,359 to 5,220 are from AO13 observations.

Name
The HEASARC has created a source designation for entries in this catalog following the standard precepts from the Dictionary of Nomenclature of Celestial Objects, using the prefix '[LUC2016] XMM' (for LaMassa, Urry, Cappelluti, 2016 XMM-Newton source) and the source number.

ObsID
The XMM-Newton observation identification (ObsID) number for the observation in which the source was detected.

RA
The Right Ascension of the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

Dec
The Declination of the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

LII
The Galactic Longitude of the XMM-Newton source.

BII
The Galactic Latitude of the XMM-Newton source.

Error_Radius
The positional uncertainty of the XMM-Newton source position, in arcseconds.

XMM_Nn_Offset
The angular distance from this XMM-Newton source to the nearest other XMM-Newton source, in arcseconds.

Extended_Flag
This flag parameter is set to non-zero values to indicate that the XMM-Newton source is extended in one or more bands while being point-like in another band, as follows:

    0 = point-like in all bands;
    1 = extended in soft (0.5-2 keV) band; point-like in other bands;
    2 = extended in full (0.5-10 keV) band; point-like in other bands;
    3 = extended in hard (2-10 keV) band; point like in other bands;
    4 = extended in soft and full bands; point-like in hard band;
    5 = extended in soft and hard bands; point-like in full band;
    6 = extended in hard and full bands; point-like in soft band.
  

XMM_AO10_Flag
This cross-correlation flag parameter is set to 'Y' to indicate that a XMM-Newton AO13 source ( i.e., any source with a value of xmm_sample = 13), has a counterpart source in the XMM-Newton archival and AO10 sample. Otherwise, it is set to 'N'. This parameter is left blank for sources with xmm_sample = 10, i.e., those in the XMM-Newton AO10 sample.

XMM_AO10_Source_Number
This parameter is only populated for XMM-Newton AO13 sources (i.e., sources with values of xmm_sample = 13). It contains the record number (rec_no) of the counterpart source in the XMM-Newton archival and AO10 sample.

CXO_Flag
This cross-correlation flag parameter is set to 'Y' to indicate that the XMM-Newton source has a counterpart source in the Chandra sample, i.e., in the SDSS Stripe 82 Chandra Catalog (the HEASARC SDSSS82CXO table). Otherwise, it is set to 'N'.

CXO_Source_Number
The identification number (MSID) of the counterpart source in the SDSS Stripe 82 Chandra Catalog (the HEASARC SDSSS82CXO table).

CXO_Mult_Flag
This flag is set to 'Y' to indicate that there are multiple Chandra matches to the XMM-Newton source, else it is set to 'N'. There are only two multiple match cases, XMM-Newton source numbers 656 and 3473. For these two sources, the additional matching Chandra MSID values are given below:

  XMM source_number   Chandra MSID listed in Table   Additional Chandra MSID

      656                     108749                    108801
     3473                     135295                    135297
  

SB_Flux
The soft-band (0.5-2 keV) flux of the XMM-Newton source, in erg cm-2 s-1. All fluxes are reported for the XMM-Newton sources, where users should refer to the sb_det_ml value for the entry to determine the appropriate level of source significance suitable for analysis. Fluxes are converted from count rates assuming a power-law spectrum where Gamma = 2.0.

SB_Flux_Error
The error in the soft-band (0.5-2 keV) flux of the XMM-Newton source, in erg cm-2 s-1.

SB_Counts
The net source counts detected in the soft band (0.5-2 keV).

SB_Det_ML
The significance of the detection in the 0.5-2.0 keV band, where det_ml = -ln Prandom, where Prandom is the Poissonian probability that a detection is due to random fluctuations. Users are cautioned to determine the flux significance necessary for their science goals before utilizing the reported flux. For reference, the authors only include objects where det _ml >= 15 in the Log N - log S relationship, and only report the luminosities for objects above this threshold.

HB_Flux
The hard-band (2 - 10 keV) flux of the XMM-Newton source, in erg cm-2 s-1. All fluxes are reported for the XMM-Newton sources, where users should refer to the hb_det_ml value for the entry to determine the appropriate level of source significance suitable for analysis. Fluxes are converted from count rates assuming a power-law spectrum where Gamma = 1.7.

HB_Flux_Error
The error in the hard-band (2-10 keV) flux of the XMM-Newton source, in erg cm-2 s-1.

HB_Counts
The net source counts detected in the hard band (2-10 keV).

HB_Det_ML
The significance of the detection in the 2-10 keV band, where det_ml = -ln Prandom, where Prandom is the Poissonian probability that a detection is due to random fluctuations. Users are cautioned to determine the flux significance necessary for their science goals before utilizing the reported flux. For reference, the authors only include objects where det _ml >= 15 in the Log N - log S relationship, and only report the luminosities for objects above this threshold.

FB_Flux
The full-band (0.5-10 keV) flux of the XMM-Newton source, in erg cm-2 s-1. All fluxes are reported for the XMM-Newton sources, where users should refer to the fb_det_ml value for the entry to determine the appropriate level of source significance suitable for analysis. Fluxes are converted from count rates assuming a power-law spectrum where Gamma = 1.7.

FB_Flux_Error
The error in the full-band (0.5-10 keV) flux of the XMM-Newton source, in erg cm-2 s-1.

FB_Counts
The net source counts detected in the full band (0.5-10 keV).

FB_Det_ML
The significance of the detection in the 0.5-10 keV band, where det_ml = -ln Prandom, where Prandom is the Poissonian probability that a detection is due to random fluctuations. Users are cautioned to determine the flux significance necessary for their science goals before utilizing the reported flux. For reference, the authors only include objects where det _ml >= 15 in the Log N - log S relationship, and only report the luminosities for objects above this threshold.

Log_SB_Lx
The logarithm of the observed soft-band (0.5-2 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band, its redshift is known, and sb_det _ml >= 15.

Log_HB_Lx
The logarithm of the observed hard-band (2-10 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band, its redshift is known, and hb_det _ml >= 15.

Log_FB_Lx
The logarithm of the observed full-band (0.5-10 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band, its redshift is known, and fb_det _ml >= 15.

SDSS_Rej_Flag
This flag parameter is set to 'Y' to indicate that a SDSS counterpart was found which exceeded the reliability threshold, but the photometry was rejected for failing quality control checks, else is set to 'N'.

SDSS_Object_ID
The SDSS object identification number (ObjID) of the SDSS counterpart to the XMM-Newton source.

SDSS_RA
The Right Ascension of the SDSS counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

SDSS_Dec
The Declination of the SDSS counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

SDSS_XMM_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the SDSS source match to the XMM-Newton source, using the highest of the u, g, r, i, and z reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

SDSS_XMM_Offset
The angular distance between the XMM-Newton source and its SDSS counterpart, in arcseconds.

SDSS_Coadd_Flag
This flag parameter is set to 'Y' if the SDSS counterpart is found from the Jiang et al. (2014, ApJS, 213, 12) coadded catalog. Otherwise, it is set to 'N' if the SDSS counterpart was identified in the single-epoch DR9 imaging catalog.

Umag
The u magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Umag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Gmag
The g magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Gmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Rmag
The r magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Rmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Imag
The i magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Imag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Zmag
The z magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Zmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the XMM-Newton source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

SDSS_Spect_Object_ID
The SDSS spectroscopic object identification number (SpecObjID) of the SDSS counterpart to the XMM-Newton source.

Spect_Class
The optical spectroscopic class as indicated by the pipeline processing (for spectra downloaded from existing databases) or determined by the authors through visual inspection for sources targeted in our follow-up campaigns, if available. The possible values are:

     Value     Meaning

     QSO       broad emission lines in spectra;
     GALAXY    narrow emission lines and/or absorption lines only;
     STAR      stellar spectrum.
  

Redshift
The spectroscopic redshift of the source.

Ref_Redshift
The source of the spectroscopic redshift, coded as follows:

     0 = SDSS DR9 (Ahn et al., 2012, ApJS, 203, 21, CDS Cat. V/139)
     1 = 2SLAQ (Croom et al., 2009, MNRAS, 392, 19)
     2 = WiggleZ (Drinkwater et al., 2010, MNRAS, 401, 1429)
     3 = DEEP2 (Newman et al., 2013, ApJS, 208, 5)
     4 = SDSS spectrum re-fit/verified by the authors
     5 = SDSS DR10 (Ahn et al., 2014, ApJS, 211, 17)
     6 = Jiang et al. (2006, AJ, 131, 2788)
     7 = WIYN HYDRA follow-up observations from 2012 Dec
     8 = PRIMUS (Coil et al., 2011, ApJ, 741, 8)
     9 = VLT ISAAC follow-up observations from 2013 Aug
    10 = Keck NIRSPEC follow-up observations from 2013 Sep
    11 = SDSS DR12 (Alam et al., 2015, ApJS, 219, 12)
    12 = WIYN Hydra follow-up observations from 2013 Aug - Sep
    13 = WIYN HYDRA follow-up observations from 2014 Jan
    14 = WIYN HYDRA follow-up observations from 2014 Jun
    15 = WIYN HYDRA follow-up observations from 2014 Jul
    16 = WIYN HYDRA follow-up observations from 2014 Sep
    17 = WIYN HYDRA follow-up observations from 2015 Jan
    18 = Palomar DoubleSpec observations from 2014 Jul
    19 = MMT Hectospec (Ross et al., 2012, ApJS, 199, 3)
    20 = Palomar DoubleSpec observations from 2014 Dec
    22 = 6dF (Jones et al., 2004, MNRAS, 355, 747 and 2009, MNRAS, 399, 683,
          CDS Cat. VII/259)
    23 = VVDS (Le Fevre et al., 2003, Proc. SPIE 4841, 1670 and
          2005, A&A, 439, 845, CDS Cat. III/250; Garilli et al., 2008, A&A,
          486, 683; Le Fevre et al., 2013, A&A, A559, 14)
  

WISE_Name
The J2000.0 position-based source designation (WISE JHHMMSS.ss+DDMMSS.s) of the WISE counterpart to the XMM-Newton source.

WISE_RA
The Right Ascension of the WISE counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

WISE_Dec
The Declination of the WISE counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

WISE_RA_Error
The positional uncertainty of the WISE counterpart position in Right Ascension, in arcseconds.

WISE_Dec_Error
The positional uncertainty of the WISE counterpart position in Declination, in arcseconds.

WISE_XMM_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the WISE source match to the XMM-Newton source. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

WISE_XMM_Offset
The angular distance between the XMM-Newton source and its WISE counterpart, in arcseconds.

W1_Mag
The W1 (3.4 um) magnitude of the WISE counterpart to the XMM-Newton source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W1_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the XMM-Newton source.

W1_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W1 band. Any WISE magnitudes with SNR < 2 are upper limits.

W2_Mag
The W2 (4.6 um) magnitude of the WISE counterpart to the XMM-Newton source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W2_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the XMM-Newton source.

W2_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W2 band. Any WISE magnitudes with SNR < 2 are upper limits.

W3_Mag
The W3 (12 um) magnitude of the WISE counterpart to the XMM-Newton source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W3_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the XMM-Newton source.

W3_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W3 band. Any WISE magnitudes with SNR < 2 are upper limits.

W4_Mag
The W4 (22 um) magnitude of the WISE counterpart to the XMM-Newton source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W4_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the XMM-Newton source.

W4_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W4 band. Any WISE magnitudes with SNR < 2 are upper limits.

WISE_Ext_Flag
This flag parameter is set to 'Y' to indicate that the WISE counterpart to the XMM-Newton source is extended, else is set to 'N'.

WISE_Rej_Flag
This flag parameter is set to 'Y' to indicate that the WISE counterpart was found via MLE matching but was rejected due to failing photometry control checks in every WISE band, else is set to 'N'.

UKIDSS_ID
The UKIDSS identification number of the infrared counterpart to the XMM-Newton source.

UKIDSS_RA
The Right Ascension of the UKIDSS counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

UKIDSS_Dec
The Declination of the UKIDSS counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

UKIDSS_XMM_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the UKIDSS source match to the XMM-Newton source: the highest of the UKIDSS Y, J, H and K reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

UKIDSS_XMM_Offset
The angular distance between the XMM-Newton source and its UKIDSS counterpart, in arcseconds.

Ymag
The Vega Y magnitude (1.02 um) of the UKIDSS counterpart to the XMM-Newton source.

Ymag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the XMM-Newton source.

Jmag
The Vega J magnitude of the UKIDSS counterpart to the XMM-Newton source.

Jmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the XMM-Newton source.

Hmag
The Vega H magnitude of the UKIDSS counterpart to the XMM-Newton source.

Hmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the XMM-Newton source.

Kmag
The Vega K magnitude of the UKIDSS counterpart to the XMM-Newton source.

Kmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the XMM-Newton source.

UKIDSS_Rej_Flag
This flag parameter is set to 'Y' to indicate that the UKIDSS counterpart was found via MLE matching, but was rejected due to failing photometry control checks, else is set to 'N'.

VHS_ID
The VHS identification number of the infrared counterpart to the XMM-Newton source.

VHS_RA
The Right Ascension of the VHS counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

VHS_Dec
The Declination of the VHS counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

VHS_XMM_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the VHS source match to the XMM-Newton source: the highest of the VHS J, H and K reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

VHS_XMM_Offset
The angular distance between the XMM-Newton source and its VHS counterpart, in arcseconds.

VHS_Jmag
The Vega J magnitude of the VHS counterpart to the XMM-Newton source.

VHS_Jmag_Error
The uncertainty in the corresponding magnitude of the VHS counterpart to the XMM-Newton source.

VHS_Hmag
The Vega H magnitude of the VHS counterpart to the XMM-Newton source.

VHS_Hmag_Error
The uncertainty in the corresponding magnitude of the VHS counterpart to the XMM-Newton source.

VHS_Kmag
The Vega K magnitude of the VHS counterpart to the XMM-Newton source.

VHS_Kmag_Error
The uncertainty in the corresponding magnitude of the VHS counterpart to the XMM-Newton source.

VHS_Rej_Flag
This flag parameter is set to 'Y' to indicate that the VHS counterpart was found via MLE matching, but was rejected due to failing photometry control checks, else is set to 'N'.

GALEX_ID
The GALEX object identification number (ObjID) of the GALEX counterpart to the XMM-Newton source.

GALEX_RA
The Right Ascension of the GALEX counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (36 arcseconds) in the original table.

GALEX_Dec
The Declination of the GALEX counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (36 arcseconds) in the original table.

GALEX_NUV_Error_Radius
The positional uncertainty of the GALEX NUV (1771-2831 Angstrom) counterpart to the XMM-Newton source, in arcseconds.

GALEX_FUV_Error_Radius
The positional uncertainty of the GALEX FUV (1344-1786 Angstrom) counterpart to the XMM-Newton source, in arcseconds.

GALEX_XMM_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the GALEX source match to the XMM-Newton source: the higher of the FUV and NUV reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper..

GALEX_XMM_Offset
The angular distance between the XMM-Newton source and its GALEX counterpart, in arcseconds.

NUV_Mag
The NUV (1771-2831 Angstrom) AB magnitude of the GALEX counterpart to the XMM-Newton source.

NUV_Mag_Error
The uncertainty in the corresponding magnitude of the GALEX counterpart to the XMM-Newton source.

FUV_Mag
The FUV (1344-1786 Angstrom) AB magnitude of the GALEX counterpart to the XMM-Newton source.

FUV_Mag_Error
The uncertainty in the corresponding magnitude of the GALEX counterpart to the XMM-Newton source.

FIRST_Name
The name of the FIRST counterpart to the XMM-Newton source, viz., FIRST JHHMMSS.s+DDMMSS.

FIRST_RA
The Right Ascension of the FIRST counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

FIRST_Dec
The Declination of the FIRST counterpart to the XMM-Newton source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

FIRST_XMM_Offset
The angular distance between the XMM-Newton source and its FIRST counterpart, in arcseconds.

Flux_20_cm
The integrated 1.4-GHz flux density of the FIRST counterpart to the XMM-Newton source, in mJy.

Flux_20_cm_Error
The uncertainty in the integrated 1.4-GHz flux density of the FIRST counterpart to the XMM-Newton source, in mJy. This was calculated by multiplying the integrated flux density by the ratio of the RMS to the peak flux density.

Herschel_RA
The Right Ascension of the Herschel counterpart to the XMM-Newton source in the selected equinox taken from the HeRS survey (Viero et al. 2014, ApJS, 210, 22). This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

Herschel_Dec
The Declination of the Herschel counterpart to the XMM-Newton source in the selected equinox taken from the HeRS survey (Viero et al. 2014, ApJS, 210, 22). This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

Herschel_XMM_Offset
The angular distance between the XMM-Newton source and its Herschel counterpart, in arcseconds.

Flux_250_um
The 250-um flux density of the Herschel counterpart to the XMM-Newton source, in mJy.

Flux_250_um_Error
The uncertainty in the corresponding flux density of the Herschel counterpart to the XMM-Newton source, in mJy.

Flux_350_um
The 350-um flux density of the Herschel counterpart to the XMM-Newton source, in mJy.

Flux_350_um_Error
The uncertainty in the corresponding flux density of the Herschel counterpart to the XMM-Newton source, in mJy.

Flux_500_um
The 500-um flux density of the Herschel counterpart to the XMM-Newton source, in mJy.

Flux_500_um_Error
The uncertainty in the corresponding flux density of the Herschel counterpart to the XMM-Newton source, in mJy.

XMM_AO10_Prom_Match
This parameter (which is only populated for XMM-Newton AO13 sources, i.e., sources with values of xmm_sample = 13) contains a flag to indicate that a multi-wavelength counterpart is promoted into the AO13 catalog from the archival and AO10 catalog: the multi-wavelength association did not meet the MLE reliability threshold when matching to the AO10 and archival catalog, but did meet this requirement for the same X-ray source in the XMM-Newton AO13 catalog. The number indicates in which catalog the promoted match is found, as follows:

    Value  Meaning

     1     SDSS counterpart found but photometry rejected for failing quality
           control checks;
     2     SDSS;
     3     redshift;
     4     WISE counterpart found but rejected for failing quality control
           checks;
     5     WISE
     6     UKIDSS
     7     VHS
     8     GALEX
  

CXO_Prom_Match
This parameter contains a flag to indicate that a multi-wavelength counterpart is promoted into this catalog: the multi-wavelength association did not meet the MLE reliability threshold when matching to the Chandra catalog, but did meet this requirement for the same X-ray source in the XMM-Newton catalog. The number indicates in which catalog the promoted match is found, as follows:

    Value  Meaning

     1     SDSS counterpart found but photometry rejected for failing quality
           control checks;
     2     SDSS;
     3     redshift;
     4     WISE counterpart found but rejected for failing quality control
           checks;
     5     WISE
     6     UKIDSS
     7     VHS
     8     GALEX
  

Ctrpt_Coord_Flag
This parameter contains a flag which is set to 0 if the multi-wavelength counterpart coordinates are consistent within 2 arcseconds (SDSS, UKIDSS, VHS, FIRST) or 3 arcseconds (WISE, GALEX, Herschel); otherwise the flag value is set to 1.

XMM_Arch_Flag
This flag parameter (which is only populated for XMM-Newton archival and AO10 sources, i.e., sources with values of xmm_sample = 10) is set to 'Y' to indicate that the source was found in archival XMM observations rather than in the AO10 observations, else is set to 'N'.

XMM_Arch_Source_Number
For sources which have xmm_arch_flag = 'Y', this parameter gives the record number of the XMM source.

Lns_Rem_Flag
This flag parameter is set to 'Y' to indicate that the XMM-Newton archival and AO10 source was removed from the logN - logS relation presented in the reference paper. Otherwise, it is set to 'N'. The removed objects are targeted sources of observations, and objects that overlap XMM-Newton observations in the field.

XMM_AO13_Prom_Match
This parameter (which is only populated for XMM-Newton archival and AO10 sources, i.e., sources with values of xmm_sample = 10) contains a flag to indicate that a multi-wavelength counterpart is promoted into this catalog: the multi-wavelength association did not meet the MLE reliability threshold when matching to the AO13 catalog, but did meet this requirement for the same X-ray source in the XMM-Newton archival and AO10 catalog. The number indicates in which catalog the promoted match is found, as follows:

    Value  Meaning

     1     SDSS counterpart found but photometry rejected for failing quality
           control checks;
     2     SDSS;
     3     redshift;
     4     WISE counterpart found but rejected for failing quality control
           checks;
     5     WISE
     6     UKIDSS
     7     VHS
     8     GALEX
  

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


Contact Person

Questions regarding the SDSSS82XMM database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 13-Jan-2017