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ELAISS1OID - ELAIS S1 Field X-Ray Source Optical/IR Identifications Catalog

HEASARC
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Overview

This table contains the optical identifications and a multi-band catalog of a sample of 478 X-ray sources detected in the XMM-Newton and Chandra surveys of the central 0.6 deg2 of the ELAIS-S1 field. The most likely optical/infrared counterpart of each X-ray source was identified using the chance coincidence probability in the R and IRAC 3.6 micron bands.This method was complemented by the precise positions obtained through Chandra observations. The authors were able to associate a counterpart to each X-ray source in the catalogue. Approximately 94% of them are detected in the R band, while the remaining are blank fields in the optical down to R ~ 24.5, but have a near-infrared counterpart detected by IRAC within 6 arcsec of the XMM-Newton centroid. The multi-band catalog, produced using the positions of the identified optical counterparts, contains photometry in ten photometric bands, from B to the MIPS 24 micron band. The spectroscopic follow-up allowed us to determine the redshift and classification for 237 sources (~ 50% of the sample) brighter than R = 24. The spectroscopic redshifts were complemented by reliable photometric redshifts for 68 sources.

The authors classified 47% of the sources with spectroscopic redshift as broad-line active galactic nuclei (BL AGNs) with z = 0.1-3.5, while sources without broad-lines (NOT BL AGNs) are about 46% of the spectroscopic sample and are found up to z = 2.6. The remaining fraction is represented by extended X-ray sources and stars. The authors spectroscopically identified 11 type 2 QSOs among the sources with F(2-10 keV)/F(R) > 8, with redshift between 0.9 and 2.6, high 2-10 keV luminosity (log L(2-10 keV) >= 43.8 erg/s) and hard X-ray colors suggesting large absorbing columns at the rest frame (log N_H up to 23.6 cm-2). BL AGNs show on average blue optical-to-near-infrared colors, softer X-ray colors and X-ray-to-optical colors typical of optically selected AGNs. Conversely, narrow-line sources show redder optical colors, harder X-ray flux ratio and span a wider range of X-ray-to-optical colors. On average the Spectral Energy Distributions (SEDs) of high-luminosity BL AGNs resemble the power-law typical of unobscured AGNs. The SEDs of NOT BLAGNs are dominated by the galaxy emission in the optical/near-infrared, and show a rise in the mid-infrared which suggests the presence of an obscured active nucleus. The authours have used the infrared-to-optical colors and near-infrared SEDs to infer the properties of the AGN host galaxies.

Identifications and photometric parameters for 478 sources detected by XMM-Newton in the ELAIS-S1 field are given. For each source, the X-ray positions and fluxes, optical position and photometry, Spitzer IRAC and MIPS 24 micron positions and fluxes, spectroscopic redshift where available, photometric redshift and SED shape classification are given.


Catalog Bibcode

2008A&A...488..417F

References

The XMM-Newton survey of the ELAIS-S1 field.
II. Identifications and multiwavelength catalogue of X-ray sources.
    Feruglio C., Fiore F., La Franca F., Sacchi N., Puccetti S., Comastri A.,
    Berta S., Gruppioni C., Mathur S, Matute I., Mignoli M., Vignali C.,
    Zamorani G.
    <Astron. Astrophys. 488, 417 (2008)>
    =2008A&A...488..417F        (SIMBAD/NED BibCode)

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 December 2008 based on the CDS Catalog J/A+A/488/417 file 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. This 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 centroid.

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

Flux
The full-band (0.5-10 keV) flux of the XMM-Newton X-ray source, in erg/s/cm2, taken from the Puccetti et al. (2006) catalog.

SNR
The signal-to-noise ratio (SNR) of the XMM-Newton X-ray source in the 0.5-10 keV energy band2, taken from the Puccetti et al. (2006) catalog.

Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm22, taken from the Puccetti et al. (2006) catalog.

HB_Flux
The hard-band (2-10 keV) flux of the XMM-Newton X-ray source, in erg/s/cm2, taken from the Puccetti et al. (2006) catalog.

HB_SNR
The signal-to-noise ratio (SNR) of the XMM-Newton X-ray source in the 2-10 keV energy band, taken from the Puccetti et al. (2006) catalog.

HB_Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm2, taken from the Puccetti et al. (2006) catalog.

SB_Flux
The soft-band (0.5-2 keV) flux of the XMM-Newton X-ray source, in erg/s/cm2, taken from the Puccetti et al. (2006) catalog.

SB_SNR
The signal-to-noise ratio (SNR) of the XMM-Newton X-ray source in the 0.5-2 keV energy band, taken from the Puccetti et al. (2006) catalog.

SB_Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm2, taken from the Puccetti et al. (2006) catalog.

UHB_Flux
The ultra-hard-band (5-10 keV) flux of the XMM-Newton X-ray source, in erg/s/cm2, taken from the Puccetti et al. (2006) catalog.

UHB_SNR
The signal-to-noise ratio (SNR) of the XMM-Newton X-ray source in the 5-10 keV energy band.

UHB_Flux_Error
The RMS uncertainty in the associated flux, in erg/s/cm2, taken from the Puccetti et al. (2006) catalog.

Chandra_Source_Number
The Chandra source number of the Chandra counterpart of the XMM-Newton source,

Chandra_RA
The Right ascension of the Chandra X-ray counterpart to the XMM-Newton source in the selected equinox.

Chandra_Dec
The Declination of the Chandra X-ray counterpart to the XMM-Newton source in the selected equinox.

Chandra_Covered
This flag parameter is set to 1 to indicate that the positioin of the XMM-Newton was covered by the Chandra observations.

Esis_Source_Number
The ESIS (ESO-Spitzer extragalactic Imaging Survey) source number of the optical counterpart to the XMM-Newton X-ray source. The ESO-Spitzer extragalactic Imaging Survey is the optical follow up of the Spitzer Wide-area Infra-Red Extragalactic (SWIRE survey) in the ELAIS S1 area.

Esis_RA
The Right ascension of the ESIS counterpart to the XMM-Newton source in the selected equinox.

Esis_Dec
The Declination of the ESIS counterpart to the XMM-Newton source in the selected equinox

Bmag_Limit
This flag parameter is set to '>' if the corresponding magnitude is a lower limit to the actual value.

Bmag
The B-band magnitude (Vega) of the ESIS counterpart to the XMM-Newton source from the ESIS Catalog

Bmag_Error
The uncertainty in the B Magnitude of the ESIS counterpart to the XMM-Newton source.

Vmag_Limit
This flag parameter is set to '>' if the corresponding magnitude is a lower limit to the actual value.

Vmag
The V-band magnitude (Vega) of the ESIS counterpart to the XMM-Newton source from the ESIS Catalog

Vmag_Error
The uncertainty in the V Magnitude of the ESIS counterpart to the XMM-Newton source.

Rmag_Limit
This flag parameter is set to '>' if the corresponding magnitude is a lower limit to the actual value.

Rmag
The R-band magnitude (Vega) of the ESIS counterpart to the XMM-Newton source from the ESIS Catalog

Rmag_Error
The uncertainty in the R Magnitude of the ESIS counterpart to the XMM-Newton source.

Vimos_RA
The Right ascension of the VIMOS/VLT counterpart to the XMM-Newton source in the selected equinox.

Vimos_Dec
The Declination of the ESIS counterpart to the XMM-Newton source in the selected equinox.

Rmag_Best_Limit
This flag parameter is set to '>' if the corresponding magnitude is a lower limit to the actual value.

Rmag_Best
The R-band magnitude (Vega) of the VIMOS/VLT counterpart to the XMM-Newton source from the ESIS Catalog.

Rmag_Best_Error
The uncertainty in the R Magnitude of the VIMOS/VLT counterpart to the XMM-Newton source.

Rmag_Ellipticity
The ellipticity of the of the VIMOS/VLT counterpart to the XMM-Newton source in the R-band.

Rmag_Flags
This parameter contains flags pertaining to the R-band measurements of the VIMOS/VLT counterpart to the XMM-Newton source.

Rmag_Galaxy_Flag
This parameter is a measure of the star/galaxy separation for the R-band VIMOS/VLT counterpart to the XMM-Newton source, where 0 is used for a galaxy.

Rmag_Serendip_Flag
The chance coincidence probability for the R-band VIMOS/VLT counterpart to the XMM-Newton source.

XMM_Opt_Offset
The X-ray versus optical position offset, in arcseconds.

Jmag_RA
The Right ascension of the J-band SOFI/NTT counterpart to the XMM-Newton source in the selected equinox.

Jmag_Dec
The Declination of the J-band SOFI/NTT counterpart to the XMM-Newton source in the selected equinox.

Jmag_Best
The Vega magnitude in the J-band of the SOFI/NTT counterpart to the XMM-Newton source in the selected equinox.

Jmag_Best_Error
The uncertainty in the J magnitude of the SOFI/NTT counterpart to the XMM-Newton source

Kmag_Limit
This flag parameter is set to '>' if the corresponding magnitude is a lower limit to the actual value.

Kmag
The Vega magnitude in the K_s-band of the SOFI/NTT counterpart to the XMM-Newton source in the selected equinox.

Kmag_Error
The uncertainty in the K_s magnitude of the SOFI/NTTT counterpart to the XMM-Newton source

Kmag_Ellipticity
The ellipticity of the of the SOFI/NTT counterpart to the XMM-Newton source in the K_s band.

Kmag_Flags
This parameter contains flags pertaining to the K_s-band measurements of the SOFI/NTT counterpart to the XMM-Newton source.

Kmag_Galaxy_Flag
This parameter is a measure of the star/galaxy separation for the K_s-band SOFI/NTT counterpart to the XMM-Newton source, where 0 is used for a galaxy.

Swire_Source_Number
The SWIRE (Spitzer Wide-area Infra-Red Extragalactic) survey IRAC source number of the near-IR counterpart to the XMM-Newton X-ray source.

IRAC_RA
The Right ascension of the IRAC counterpart to the XMM-Newton source in the selected equinox.

IRAC_Dec
The Declination of the IRAC counterpart to the XMM-Newton source in the selected equinox.

Flux_3p6_um
The IRAC aperture/Kron flux density at 3.6 microns of the IR counterpart to the X-ray source, in microJanskies (uJy).

Flux_3p6_um_Error
The RMS uncertainty in the associated flux density, in uJy.

Flux_4p5_um
The IRAC aperture/Kron flux density at 4.5 microns of the IR counterpart to the X-ray source, in microJanskies (uJy)

Flux_4p5_um_Error
The RMS uncertainty in the associated flux density, in uJy.

Flux_5p8_um
The IRAC aperture/Kron flux density at 5.8 microns of the IR counterpart to the X-ray source, in microJanskies (uJy)

Flux_5p8_um_Error
The RMS uncertainty in the associated flux density, in uJy.

Flux_8p0_um
The IRAC aperture/Kron flux density at 8.0 microns of the IR counterpart to the X-ray source, in microJanskies (uJy)

Flux_8p0_um_Error
The RMS uncertainty in the associated flux density, in uJy.

Flux_24_um
The MIPS aperture/Kron flux density at 24 microns of the IR counterpart to the X-ray source, in microJanskies (uJy).

Flux_24_um_Error
The RMS uncertainty in the associated flux density, in uJy.

XMM_IRAC_Offset
The X-ray versus IRAC position offset, in arcseconds.

IRAC_Serendip_Flag
The chance coincidence probability for the 3.6 um band IRAC counterpart to the XMM-Newton source.

Photometry_Flag
This photometry flag is set to 2.2 for ESO/WFI measurements, or to 8.0 for VIMOS/VLT measurements.

Spectrum_ID
The FORS2/VLT spectrum ID for the optical counterpart to the X-ray source.

Spectrum_Code
The FORS2/VLT spectrum code for the optical counterpart to the X-ray source.

Redshift
The spectroscopic redshift of the optical counterpart to the X-ray source.

Redshift_Flag
The spectroscopic redshift quality flag, where 2 means that the quoted redshift is secure, 1 that it was derived based on only 1 emission line, and a value less than 1 means that it should be regarded as tentative.

Broad_Type
A broad classification for the optical counterpart to the X-ray source based on its spectrum, as follows:

             1 = type 1 AGN
             2 = emission line galaxy
             3 = galaxy without emission lines
             4 = star
             5 = type 2 AGN
             6 = galaxies associated with extended sources (clusters)
  

Instrument_Code
This parameter contains the instrument code for the source of the optical spectroscopy, as follows:

             15 = spectra of bright sources from La Franca et al. (2004,
                   Cat. <J/AJ/127/3075>
             73 = VIMOS/VLT
             75 = VIMOS/VLT
             77 = FORS2/VLT
             78 = FORS2/VLT
            360 = EFOSC/VLT
  

Sed_Classification
This parameter contains the optical spectral energy distribution (SED) classification, coded as follows:

              0 = no classification
              2 = early-type-like
              3 = infrared excess
              4 = infrared excess
              5 = dominated by emission features
             11 = optically blue power-law
             12 = optically red PL
  

Photo_Redshift
The best-fit photometric redshift of the counterpart to the X-ray source, calculated as discussed in section 4.2 of the primary reference paper.

Photo_Redshift_Chi2
The chi-squared value for the photometric redshift fit of the counterpart to the X-ray source.

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


Contact Person

Questions regarding the ELAISS1OID database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 5-Mar-2012