SPIDERSROS - SDSS-IV/SPIDERS ROSAT-Based X-Ray Point Source Spectroscopic Catalog

Overview

This catalog aims to provide a detailed description of the SPectroscopic IDentification of ERosita Sources (SPIDERS) survey, an SDSS-IV program aimed at obtaining spectroscopic classification and redshift measurements for complete samples of sufficiently bright X-ray sources.

The authors describe the SPIDERS X-Ray Point Source Spectroscopic Catalog, considering its store of 11,092 observed spectra drawn from a parent sample of 14,759 ROSAT and XMM sources over an area of 5,129 deg² covered in SDSS-IV by the eBOSS survey.

This catalog presents the SPIDERS ROSAT subsample of 21,288 sources which were drawn from the Second ROSAT All-Sky Survey (2RXS), provided by the HEASARC in RASS2RXS. The accompanying SPIDERSXMM table contains the 3,196 sources drawn from the XMM Slew Survey Source Catalog, version 2 (XMMSL2), provided by the HEASARC in XMMSLEWFUL.

This program represents the largest systematic spectroscopic observation of an X-ray selected sample. A total of 10,970 (98.9%) of the observed objects are classified and 10,849 (97.8%) have secure redshifts. The majority of the spectra (10,070 objects) are active galactic nuclei (AGN), 522 are cluster galaxies, and 294 are stars.

The SDSS-IV/BOSS spectrographic observations are taken between 2014 and 2019.

Catalog Bibcode

2020A&A...636A..97C

References

The Final SDSS-IV/SPIDERS X-ray Point Source Spectroscopic Catalogue.
    Comparat J., Merloni A., Dwelly T., Salvato M., Schwope A.,
    Coffey D., Wolf J., Arcodia R., Liu T., Buchner J., Nandra K.,
    Georgakakis A., Clerc N., Brusa M., Brownstein J.R., Schneider D.P.,
    Pan K., Bizyaev D.
    <Astron. Astrophys. 636, A97 (2020)>
    =2020A&A...636A..97C

Provenance

This table was created by the HEASARC in May 2020 based upon the CDS Catalog J/A+A/636/A97 file vc2rxs.dat.

Parameters

Name
The source designation based on the Second ROSAT All-Sky Survey (2RXS), and matching the name in the HEASARC RASS2RXS table.

Detect_Likelihood
The statistic derived from the maximum likelihood source detection analysis, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Counts
The background-corrected source counts, based on the Second ROSAT all-sky survey (2RXS) Source Catalog.

Counts_Error
The error in the background-corrected source counts, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Count_Rate
The background-corrected source count rate, in counts per second, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Count_Rate_Error
The error in the background-corrected source count rate, in counts per second, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Exposure
The source exposure time in seconds, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

RA
The Right Ascension of the source, given in J2000.0 decimal degrees to a precision of 10^-5 degrees in the originating table. These coordinates are based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Dec
The Declination of the source, given in J2000.0 decimal degrees to a precision of 10^-5 degrees in the originating table. These coordinates are based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

LII
The Galactic longitude of the source.

BII
The Galactic latitude of the source.

Extent
The source extent in image pixels, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Extent_Error
The uncertainty in the source extent, in image pixels, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Extent_Likelihood
The likelihood that the X-ray source is extended, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Error_Radius
The source positional error, in arcsec, based on the Second ROSAT All-Sky Survey (2RXS) Source Catalog.

Near_Bs_Flag
This Boolean flag (0 or 1) indicates whether the source is located nearby to a bright star.

Near_Gal_Flag
This Boolean flag (0 or 1) indicates whether the source is located nearby to a bright galaxy.

Log_NH
The logarithm of the mean Galactic equivalent hydrogen column density, in units of cm^-2, in the direction of the source.

Flux
The unabsorbed flux in the 0.1-2.4 keV band corrected for full Galactic column, in erg/cm²/s.

Flux_Error
The statistical uncertainty in the unabsorbed flux, in erg/cm²/s.

Bias
The probability weighting introduced by the AllWISE prior, where a value of 1 indicates no change. (See Appendix B of Salvato et al., 2018, Cat. J/MNRAS/473/4937.)

Prob_Any
The probability p_any that there is a correct counterpart for the specified X-ray source among the listed associations. The lower the value of p_any, the lower is the confidence that a reliable counterpart was found. (See Section 4.2 of the paper: Salvato et al., 2018, Cat. J/MNRAS/473/4937.)

Prob_I
The relative probability of the specific match (p_i) to the X-ray source, if one exists. The p_i values add up to unity for each X-ray source.

AllWISE_Name
The WISE All-Sky Release Catalog (AllWISE) IR source Designation, from Cutri et al. (2013, CDS Cat. II/328).

AllWISE_RA
The right ascension of the WISE All-Sky Release Catalog (AllWISE) IR source in the selected equinox. This was given in J2000.0 decimal degrees in the original table.

AllWISE_Dec
The declination of the WISE All-Sky Release Catalog (AllWISE) IR source in the selected equinox. This was given in J2000.0 decimal degrees in the original table.

AllWISE_Error_Radius
The positional error of the WISE All-Sky Release Catalog (AllWISE) IR source, in arcseconds.

W1_Mag
The AllWISE W1 ([3.4] um) magnitude of the AllWISE infrared source.

W1_Mag_Error
The uncertainty in the AllWISE magnitude in the W1 band.

W2_Mag
The AllWISE W2 ([4.6] um) magnitude of the AllWISE infrared source.

W2_Mag_Error
The uncertainty in the AllWISE magnitude in the W2 band.

W3_Mag
The AllWISE W3 ([12] um) magnitude of the AllWISE infrared source.

W3_Mag_Error
The uncertainty in the AllWISE magnitude in the W3 band.

W4_Mag
The AllWISE W4 ([22] um) magnitude of the AllWISE infrared source.

W4_Mag_Error
The uncertainty in the AllWISE magnitude in the W4 band.

AllWISE_Contcon_Flag
The AllWISE contamination and confusion flag, from Cutri et al. (2013, CDS Cat. II/328), that indicates that the photometry and/or position measurements of a source may be contaminated or biased due to proximity to an image artifact. This field provides one character per band, which is coded as follows:

       D,d =  Diffraction spike. Source may be a spurious detection of or
                          contaminated by a diffraction spike from a nearby
                          bright star on the same image.
       P,p = Persistence. Source may be a spurious detection of or contaminated
                          by a latent image left by a bright star.
       H,h = Halo. Source photometry may be a spurious detection of or
                          contaminated by the scattered light halo surrounding
                          a nearby bright source.
       O,o = (letter "o") Optical ghost. Source may be a spurious detection
                          of or contaminated by an optical ghost image caused
                          by a nearby bright source.
       0  = (number zero) Source is unaffected by known artifacts.

AllWISE_Extent_Flag
The AllWISE extended source flag, from Cutri et al. (2013, CDS Cat. II/328), that describes the extended nature of the source as follows:

       0 = The source shape is consistent with a point-source and the source is not
              associated with or superimposed on a 2MASS XSC source
       1 = The profile-fit photometry goodness-of-fit is >3.0 in one or
             more bands.
       2 = The source falls within the extrapolated isophotal footprint of a
             2MASS XSC source.
       3 = The profile-fit photometry goodness-of-fit is >3.0 in one or
             more bands, and The source falls within the extrapolated isophotal
             footprint of a 2MASS XSC source.
       4 = The source position falls within 5" of a 2MASS XSC source.
       5 = The profile-fit photometry goodness-of-fit is >3.0 in one or
             more bands, and the source position falls within 5" of a 2MASS XSC source.

AllWISE_Var_Flag
The variability flag is a 4-character string, one character per band, containing a value related to the probability that the source flux measured on the individual WISE exposures is variable. These flags come from Cutri et al. (2013, CDS Cat. II/328), and are defined as follows:

     "n"= insufficient or inadequate data to make a determination  (<6 exposures)
      values 0 through 9 indicate increasing probabilities of variation;
      0-5 = most likely not variable
      6-7 = likely variables (but susceptible of false-positive variability)
      >7 = have the highest probability of being true variables

Jmag
The 2MASS magnitude in the J band of the infrared counterpart, as given in the AllWISE Catalog.

Jmag_Error
The uncertainty in the 2MASS magnitude in the J band of the infrared counterpart, as reported in the AllWISE Catalog.

Hmag
The 2MASS magnitude in the H band of the infrared counterpart, as given in the AllWISE Catalog.

Hmag_Error
The uncertainty in the 2MASS magnitude in the H band of the infrared counterpart, as reported in the AllWISE Catalog.

Kmag
The 2MASS magnitude in the K band of the infrared counterpart, as given in the AllWISE Catalog.

Kmag_Error
The uncertainty in the 2MASS magnitude in the K band of the infrared counterpart, as reported in the AllWISE Catalog.

AllWISE_2RXS_Offset
The angular separation between the positions of the AllWISE candidate counterpart and 2RXS source, in arcseconds.

SDSS_Run_Number
The SDSS run number for the optical SDSS counterpart.

SDSS_Rerun_Number
The SDSS rerun number for the optical SDSS counterpart.

SDSS_Camera_Column
The SDSS camera column for the optical SDSS counterpart.

SDSS_Field_Number
The SDSS field number for the optical SDSS counterpart.

SDSS_Id_Number
The SDSS identification (ID) number within the field. This is not the objID parameter referred to in the SDSS Catalog Archive Server.

SDSS_RA
The Right Ascension in ICRS system for the optical SDSS counterpart.

SDSS_Dec
The Declination in ICRS system for the optical SDSS counterpart.

SDSS_Umag
The SDSS model AB magnitude in the u filter for the optical SDSS counterpart.

SDSS_Gmag
The SDSS model AB magnitude in the g filter for the optical SDSS counterpart.

SDSS_Rmag
The SDSS model AB magnitude in the r filter for the optical SDSS counterpart.

SDSS_Imag
The SDSS model AB magnitude in the i filter for the optical SDSS counterpart.

SDSS_Zmag
The SDSS model AB magnitude in the z filter for the optical SDSS counterpart.

SDSS_Ufmag
The SDSS fiber AB magnitude in the u filter for the optical SDSS counterpart to the X-ray source, assuming a 2-arcsec diameter fiber.

SDSS_Gfmag
The SDSS fiber AB magnitude in the g filter for the optical SDSS counterpart to the X-ray source, assuming a 2-arcsec diameter fiber.

SDSS_Rfmag
The SDSS fiber AB magnitude in the r filter for the optical SDSS counterpart to the X-ray source, assuming a 2-arcsec diameter fiber.

SDSS_Ifmag
The SDSS fiber AB magnitude in the i filter for the optical SDSS counterpart to the X-ray source, assuming a 2-arcsec diameter fiber.

SDSS_Zfmag
The SDSS fiber AB magnitude in the z filter for the optical SDSS counterpart to the X-ray source, assuming a 2-arcsec diameter fiber.

AllWISE_SDSS_Offset
The angular separation between the positions of the AllWISE and SDSS candidate counterpart, in arcseconds.

AllWISE_SDSS_Rank
The rank order of SDSS counterpart, based on distance from AllWISE source position.

SDSS_Number_Ctrprts
The number of SDSS potential counterparts within 3 arcsec.

SDSS_Spec_Dr_Num
The data release number corresponding to the SDSS spectroscopic data containing the most likely optical counterpart.

SDSS_Spec_Plate_Num
The plate number corresponding to the relevant SDSS spectroscopic data. Along with the sdss_spec_mjd_num and sdss_spec_fiber_num, this number identifies the spectrum for the most likely optical counterpart.

SDSS_Spec_Mjd_Num
The Modified Julian Date (MJD) corresponding to the relevant SDSS spectroscopic data. Along with the sdss_spec_plate_num and sdss_spec_fiber_num, this number identifies the spectrum for the most likely optical counterpart.

SDSS_Spec_Fiber_Num
The fiber number corresponding to the relevant SDSS spectroscopic data. Along with the sdss_spec_plate_num and sdss_spec_mjd_num, this number identifies the spectrum for the most likely optical counterpart.

Redshift_Dr16
The redshift based on the SDSS DR16 pipeline spectral analysis.

Redshift_Dr16_Error
The redshift error based on the SDSS DR16 pipeline spectral analysis.

SDSS_Dr16_Type
The broad classification for the source based on the spectral analysis completed by the SDSS DR16 pipeline.

SDSS_Dr16_Subtype
The detailed classification for the source based on the spectral analysis completed by the SDSS DR16 pipeline.

Redshift_Dr16_Flag
The SDSS DR16 pipeline ZWARNING parameter that provides a bitmask-encoded value for the spectral-fitting quality flag, as specified at the SDSS DR16 website. Values of "0" signify good quality data.

SDSS_Dr16_SNR
The median signal-to-noise ratio per pixel in the spectrum based on the SDSS DR16 pipeline analysis.

Redshift_Dr7q_Flag
The flag marks whether spectroscopic redshift information exists for the source in DR7 QSO Catalog (Schneider et al., Cat. VII/260).

Redshift_Dr16q_Flag
The flag indicates whether spectroscopic redshift information exists for the source in the DR16 QSO Catalog.

Redshift_A07_Flag
The flag indicates whether spectroscopic redshift information exists for the source in Anderson et al. (2007, Cat. J/AJ/133/313).

Redshift_P10_Flag
The flag indicates whether spectroscopic redshift information exists for the source in Plotkin et al. (2010, Cat. J/AJ/139/390).

Redshift_Vis_Flag
The flag indicates whether the redshift has been visually inspected.

Ref_Redshift
The origin of the best visually-inspected redshift (selected from one the listed catalogs: DR7Q, DR16Q, AO7, P10, or SPIDERS).

Redshift
The most reliable redshift, based on either the visually-inspected or pipeline-derived redshift.

Redshift_Diff
The difference between the pipeline-derived redshift, redshift_dr16, and most reliable redshift (given in the field 'redshift').

Source_Type
The best spectral classification after visually inspection, denoted as follows:

       QSO/BLAGN = broad-line quasar
       BAL_QSO/QSO_BAL = broad absorption line quasar
       NALGN = narrow line AGN
       BLAZAR/BLLAC = blazar
       GALAXY = galaxy
       STAR = star
       NONE/UNDET. = unknown

Spec_Visual_Flag
The visual inspection confidence flag that designates the quality of the redshift estimate, denoted as follows:

       3 = secure redshift
       2 = uncertain redshift
       1 = poor quality redshift
       0 = poor quality data
      -1 = no redshift information

FIRST_RA
The Right Ascension of the radio counterpart, based on the FIRST Survey Catalog, version 2014 (Helfand et al., 2015, CDS VIII/59).

FIRST_Dec
The Declination of the radio counterpart, based on the FIRST Survey Catalog, version 2014 (Helfand et al., 2015, CDS VIII/59).

FIRST_Peak_Flux
The peak flux density at 1.4 GHz, in mJy, of the radio counterpart, based on the FIRST Survey Catalog, version 2014 (Helfand et al., 2015, CDS VIII/59).

FIRST_Int_Flux
The integrated flux density at 1.4 GHz, in mJy, of the radio counterpart, based on the FIRST Survey Catalog, version 2014 (Helfand et al., 2015, CDS VIII/59).

FIRST_RMS
The root mean squared value of the noise estimate, in mJy, of the radio counterpart, based on the FIRST Survey Catalog, version 2014 (Helfand et al., 2015, CDS VIII/59).

AllWISE_FIRST_Offset
The angular separation between the positions of the AllWISE and FIRST candidate counterpart, in arcseconds.

Gaia_Name
The source identification of the optical counterpart from the Gaia DR2 catalog. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_RA
The barycentric Right Ascension in ICRS, at epoch 2015.5, from Gaia DR2 catalog. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_Dec
The barycentric Declination in ICRS, at epoch 2015.5, from Gaia DR2 catalog. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_Parallax
The absolute stellar parallax, in milliarcseconds, for the optical counterpart from the Gaia DR2 catalog. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_Parallax_Error
The standard error in the absolute stellar parallax, in milliarcseconds.

Gaia_PM_RA
The proper motion in Right Ascension of the source in ICRS at the reference epoch 2015.5, based on Gaia DR2 (see Gaia Collaboration, 2018, CDS I/345), in units of milliarcseconds/year. This is the tangent plane projection of the proper motion vector in the direction of increasing right ascension.

Gaia_PM_RA_Error
The standard error of the Gaia proper motion in the Right Ascension, in units of milliarcseconds/year.

Gaia_PM_Dec
The proper motion in Declination of the source at the reference epoch 2015.5, based on Gaia DR 2 (see Gaia Collaboration, 2018, CDS I/345), in units of milliarcseconds/year. This is the tangent plane projection of the proper motion vector in the direction of increasing declination.

Gaia_PM_Dec_Error
The standard error in the Gaia proper motion in declination, in units of milliarcseconds/year.

Gaia_Gmag
The source Vega (Johnson) G-Band mean magnitude, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.) This is computed from the G-band mean flux applying the magnitude zero-point in the Vega scale. No error is provided for this quantity as the error distribution is only symmetric in flux space. This converts to an asymmetric error distribution in magnitude space which cannot be represented by a single error value.

Gaia_G_Band_Flux
The G-band mean flux of the Gaia optical counterpart, in electrons per second, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_G_Band_Flux_Error
The uncertainty in the G-band mean flux of the Gaia optical counterpart, in electrons per second, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345).

Gaia_Bpmag
The mean magnitude in the integrated BP band for the source, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.) This is computed from the BP-band mean flux applying the magnitude zero-point in the Vega scale. No error is provided for this quantity as the error distribution is only symmetric in flux space. This converts to an asymmetric error distribution in magnitude space which cannot be represented by a single error value.

Gaia_Bp_Band_Flux
The mean flux of the integrated BP band for the Gaia optical counterpart, in electrons per second, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_Bp_Band_Flux_Error
The standard error of the mean flux of the integrated BP band for the Gaia optical counterpart, in electrons per second, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_Rpmag
The mean magnitude in the integrated RP band for the source, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.) This is computed from the BP-band mean flux applying the magnitude zero-point in the Vega scale. No error is provided for this quantity as the error distribution is only symmetric in flux space. This converts to an asymmetric error distribution in magnitude space which cannot be represented by a single error value.

Gaia_Rp_Band_Flux
The mean flux of the integrated RP band for the Gaia optical counterpart, in electrons per second, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.)

Gaia_Rp_Band_Flux_Error
The standard error of the mean flux of the integrated RP band for the Gaia optical counterpart, in electrons per second, based on Gaia DR2. (See Gaia Collaboration, 2018, CDS I/345.)

AllWISE_Gaia_Offset
The angular separation between the positions of the AllWISE and Gaia candidate counterpart, in arcseconds.

Class
The Browse source classification, as assigned by the HEASARC and based on the value of the source_type parameter.

Contact Person

Questions regarding the SPIDERSROS database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Wednesday, 23-Nov-2022 19:37:30 EST