SPIDERSROS ivo://nasa.heasarc/spidersros NASA/GSFC HEASARC Comparat et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source 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 deg<sup>2</sup> 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 <a href="/W3Browse/rosat/rass2rxs.html">RASS2RXS</a>. The accompanying <a href="/W3Browse/xmm-newton/spidersxmm.html">SPIDERSXMM</a> table contains the 3,196 sources drawn from the XMM Slew Survey Source Catalog, version 2 (XMMSL2), provided by the HEASARC in <a href="/W3Browse/xmm-newton/xmmslewful.html">XMMSLEWFUL</a>. 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. This table was created by the HEASARC in May 2020 based upon the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/636/A97">CDS Catalog J/A+A/636/A97</a> file vc2rxs.dat. This is a service provided by NASA HEASARC . 2020A&A...636A..97C https://heasarc.gsfc.nasa.gov/W3Browse/all/spidersros.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=spidersros& GET text/xml 180 99999 true 11.13612 -7.27942 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=spidersros GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_spidersros&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.0166666666666667 Optical X-ray public spidersros SDSS-IV/SPIDERS ROSAT-Based X-Ray Point Source Spectroscopic Cat name 2RXS Source Designation (RXS_IAU_NAME) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable flux RXS Source Flux (RXS_SRC_FLUX) erg/s/cm^2 phot.flux;em.X-ray double nullable flux_error Error in RXS Source Flux (RXS_SRC_FLUX_ERR) erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable redshift Most Reliable Redshift (from VI or Pipeline) (Z_BEST) src.redshift double nullable source_type Spectral Classification After Visual Inspection (CLASS_BEST) src.class char nullable first_peak_flux FIRST Peak Flux Density at 1.4 GHz (FIRST_FPEAK) mJy phot.flux.density;em.radio.750-1500MHz double nullable class Browse Object Classification src.class short nullable gaia_name Gaia DR2 Source Identification (GAIA_DR2_source_id) meta.id char nullable allwise_sdss_offset Distance Between AllWISE and SDSS Counterparts (DIST_ALLW_SDSS) arcsec pos.angDistance double nullable allwise_gaia_offset Distance Between AllWISE Source and GAIA DR2 Counterparts (DIST_ALLW_GAIA_DR2) arcsec pos.angDistance double nullable sdss_zmag SDSS Model Magnitude in z Filter (AB) (SDSS_MODELMAG_z) mag phot.mag;em.opt.I double nullable count_rate_error 2RXS Error in Count Rate (RXS_e_CRate) ct/s stat.error;phot.count;em.X-ray double nullable gaia_gmag Gaia DR2 G-Band Mean Magnitude (Vega) (GAIA_DR2_phot_g_mean_mag) mag phot.mag;em.opt double nullable prob_i NWAY Probability AllWISE Source Is the Best Counterpart stat.fit.goodness double nullable sdss_rmag SDSS Model Magnitude in r Filter (AB) (SDSS_MODELMAG_r) mag phot.mag;em.opt.R double nullable lii Galactic Longitude degree pos.galactic.lon double nullable redshift_dr16 SDSS DR16 Pipeline Redshift (DR16_Z) src.redshift double nullable gaia_pm_dec Gaia DR2 Proper Motion alogn DE (GAIA_DR2_pmdec) mas/yr pos.pm;pos.eq.dec double nullable first_ra FIRST Right Ascension (FIRST_RA) degree pos.eq.ra double nullable sdss_field_number SDSS Field Number (SDSS_FIELD) meta.id short nullable bias Bias Parameter for the NWAY Association stat.fit.param double nullable first_rms FIRST Local Noise Estimate (FIRST_RMS) mJy stat.stdev;instr.det.noise double nullable sdss_rerun_number SDSS Counterpart Procession Rerun Number (SDSS_RERUN) meta.id short nullable prob_any NWAY Probability 2RXS Source Has an AllWISE Counterpart stat.fit.goodness double nullable sdss_imag SDSS Model Magnitude in i Filter (AB) (SDSS_MODELMAG_i) mag phot.mag;em.opt.I double nullable hmag AllWISE H Magnitude (ALLW_Hmag) mag phot.mag;em.IR.H double nullable sdss_spec_plate_num Best SDSS Plate Number (PLATE_BEST) meta.id int nullable sdss_dr16_snr SDSS Pipeline Median SN (DR16_SN_MEDIAN_ALL) stat.snr double nullable near_gal_flag Boolean Flag [01] Indicates the RXS Source Is Near a Galaxy meta.code short nullable detect_likelihood 2RXS Detection Likelihood (RXS_ExiML) stat.likelihood double nullable sdss_zfmag SDSS Fiber Magnitude in z Filter (AB) (SDSS_FIBER2MAG_z) mag phot.mag;em.opt.I double nullable gaia_pm_ra_error Standard Error of pmRA (GAIA_DR2_pmra_error) mas/yr stat.error;pos.pm;pos.eq.ra double nullable extent_error 2RXS Error in Source Extent (RXS_e_Ext) pixel stat.error;phys.angSize double nullable sdss_spec_mjd_num Date of the Best SDSS Spectroscopic Data (MJD_BEST) mjd meta.id int nullable allwise_first_offset Distance Between AllWISE and FIRST Counterparts (DIST_ALLW_FIRST) arcsec pos.angDistance double nullable log_nh 2RXS Galactic Neutral Hydrogen Density (RXS_LOGGALNH) log(cm^-2) double nullable gaia_ra Gaia DR2 Right Ascension (ICRS) at Ep=2015.5 (GAIA_DR2_ra) degree pos.eq.ra double nullable gaia_parallax_error Standard Error of Parallax (GAIA_DR2_parallax_error) mas stat.error;pos.parallax double nullable w1_mag AllWISE W1 Magnitude (ALLW_W1mag) mag phot.mag;em.IR.3-4um double nullable first_int_flux FIRST Integrated Flux Density at 1.4 GHz (FIRST_FINT) mJy phot.flux.density;em.radio.750-1500MHz double nullable redshift_dr16q_flag Spectroscopic Redshift Information in DR16 QSO Catalog (DR16Q_MEMBER) meta.code.member short nullable jmag AllWISE J Magnitude (ALLW_Jmag) mag phot.mag;em.IR.J double nullable gaia_bp_band_flux Gaia DR2 Mean Flux in the Integrated BP Band (GAIA_DR2_phot_bp_mean_flux) electron/s phot.flux.density;em.opt double nullable redshift_dr7q_flag Spectroscopic Redshift Information in DR7 QSO Catalog meta.code.member short nullable jmag_error Mean Error in J Magnitude (ALLW_e_Jmag) mag stat.error;phot.mag;em.IR.J double nullable ref_redshift Origin of Visually Inspected Redshift (VI_ORIGIN) meta.ref;src.redshift char nullable gaia_pm_dec_error Standard Error of pmDE (GAIA_DR2_pmdec_error) mas/yr stat.error;pos.pm;pos.eq.dec double nullable gaia_pm_ra Gaia DR2 Proper Motion Along RA, pmRA*cosDE (GAIA_DR2_pmra) mas/yr pos.pm;pos.eq.ra double nullable redshift_a07_flag Spectroscopic Redshift Information in Anderson et al. meta.code.member short nullable extent 2RXS Source Extent (RXS_Ext) pixel phys.angSize double nullable allwise_ra AllWISE Right Ascension (ALLW_RA) degree pos.eq.ra double nullable sdss_gfmag SDSS Fiber Magnitude in g Filter (AB) (SDSS_FIBER2MAG_g) mag phot.mag;em.opt.B double nullable gaia_bpmag Gaia DR2 Integrated BP Mean Magnitude (Vega) (GAIA_DR2_phot_bp_mean_mag) mag phot.mag;em.opt double nullable allwise_contcon_flag AllWISE Contamination and Confusion Flag, One per Band (ALLW_cc_flags) meta.code char nullable sdss_dr16_subtype SDSS Pipeline Subclass (DR16_SUBCLASS) meta.code.class char nullable w1_mag_error Mean Error in W1 Magnitude (ALLW_e_W1mag) mag stat.error;phot.mag;em.IR.3-4um double nullable allwise_sdss_rank Rank Order of SDSS Counterpart in Distance (RANK_DIST_ALLW_SDSS) meta.code short nullable gaia_g_band_flux_error Error in G-Band Mean Flux (GAIA_DR2_phot_g_mean_flux_error) electron/s stat.error;phot.flux.density;em.opt double nullable sdss_run_number SDSS Counterpart Imaging Run Number (SDSS_RUN) meta.id short nullable sdss_dr16_type SDSS Pipeline Class (DR16_CLASS) meta.code.class char nullable near_bs_flag Boolean Flag [01] Indicates the RXS Source Is Near a Bright Star meta.code short nullable w3_mag_error Mean Error in W3 Magnitude (ALLW_e_W3mag) mag stat.error;phot.mag;em.IR.8-15um double nullable count_rate 2RXS Source Count Rate (RXS_CRate) ct/s phot.count;em.X-ray double nullable gaia_rpmag Gaia DR2 Integrated RP Mean Magnitude (Vega) (GAIA_DR2_phot_rp_mean_mag) mag phot.mag;em.opt double nullable sdss_spec_fiber_num Best SDSS Fiber Number (FIBERID_BEST) meta.id short nullable extent_likelihood 2RXS Probability of Source Extent (RXS_ExtML) stat.likelihood;phys.angSize double nullable allwise_var_flag AllWISE Variability Flag, One per Band (ALLW_var_flg) meta.code;src.var char nullable gaia_g_band_flux Gaia DR2 G-Band Mean Flux (GAIA_DR2_phot_g_mean_flux) electron/s phot.flux.density;em.opt double nullable gaia_parallax Gaia DR2 Absolute Stellar Parallax (GAIA_DR2_parallax) mas pos.parallax double nullable sdss_rfmag SDSS Fiber Magnitude in r Filter (AB) (SDSS_FIBER2MAG_r) mag phot.mag;em.opt.R double nullable allwise_error_radius Error in AllWISE Position (ALLW_RADECERR) arcsec stat.error;pos double nullable gaia_rp_band_flux Gaia DR2 Mean Flux in the Integrated RP Band (GAIA_DR2_phot_rp_mean_flux) electron/s phot.flux.density;em.opt double nullable bii Galactic Latitude degree pos.galactic.lat double nullable error_radius Error in RXS Positions (RXS_RADEC_ERR) arcsec stat.error;pos double nullable sdss_gmag SDSS Model Magnitude in g Filter (AB) (SDSS_MODELMAG_g) mag phot.mag;em.opt.B double nullable w4_mag AllWISE W4 Magnitude (ALLW_W4mag) mag phot.mag;em.IR.15-30um double nullable w2_mag_error Mean Error in W2 Magnitude (ALLW_e_W2mag) mag stat.error;phot.mag;em.IR.4-8um double nullable sdss_ufmag SDSS Fiber Magnitude in u Filter (AB) (SDSS_FIBER2MAG_u) mag phot.mag;em.opt.U double nullable redshift_vis_flag Flag Indicates Redshift Has Been Visually Inspected (VI_MEMBER) meta.code.member short nullable sdss_id_number SDSS Identification Number (SDSS_ID) meta.id short nullable gaia_dec Gaia DR2 Declination (ICRS) at Ep=2015.5 (GAIA_DR2_dec) degree pos.eq.dec double nullable spec_visual_flag Visual Inspection Confidence Class (CONF_BEST) meta.code.class short nullable sdss_dec SDSS Declination (ICRS) (SDSS_DEC) degree pos.eq.dec double nullable sdss_ifmag SDSS Fiber Magnitude in i Filter (AB) (SDSS_FIBER2MAG_i) mag phot.mag;em.opt.I double nullable exposure 2RXS Source Exposure Time (RXS_ExpTime) s time.duration;obs.exposure double nullable redshift_dr16_flag SDSS Pipeline ZWARNING (DR16_ZWARNING) meta.code short nullable counts 2RXS Background Corrected Source Counts (RXS_Cts) ct phot;em.X-ray double nullable hmag_error Mean Error in H Magnitude (ALLW_e_Hmag) mag stat.error;phot.mag;em.IR.H double nullable kmag AllWISE K Magnitude (ALLW_Kmag) mag phot.mag;em.IR.K double nullable sdss_ra SDSS Right Ascension (ICRS) (SDSS_RA) degree pos.eq.ra double nullable allwise_name AllWISE Designation (ALLW_designation) meta.id char nullable redshift_diff Difference Between Pipeline and Best Redshift (Z_DIFF) src.redshift;arith.diff double nullable counts_error 2RXS Error in Source Counts (RXS_e_Cts) ct stat.error;phot;em.X-ray double nullable sdss_number_ctrprts Number of SDSS Potential Counterparts within 3 arcsec (NUM_SDSS) meta.number short nullable allwise_dec AllWISE Declination (ALLW_DEC) degree pos.eq.dec double nullable redshift_p10_flag Spectroscopic Redshift Information in Plotkin et al. meta.code.member short nullable sdss_spec_dr_num Spectroscopic Data Release Used (DR_BEST) meta.id char nullable sdss_camera_column SDSS Counterpart Column in the Imaging Camera (SDSS_CAMCOL) meta.id short nullable w4_mag_error Mean Error in W4 Magnitude (ALLW_e_W4mag) mag stat.error;phot.mag;em.IR.15-30um double nullable gaia_bp_band_flux_error Gaia DR2 Error in the Integrated BP Mean Flux (GAIA_DR2_phot_bp_mean_flux_error) electron/s stat.error;phot.flux.density;em.opt double nullable w2_mag AllWISE W2 Magnitude (ALLW_W2mag) mag phot.mag;em.IR.4-8um double nullable allwise_2rxs_offset Distance Between 2RXS Source and AllWISE Counterpart (DIST_NWAY_ALLW) arcsec pos.angDistance double nullable gaia_rp_band_flux_error Error in the Integrated RP Mean Flux (GAIA_DR2_phot_rp_mean_flux_error) electron/s stat.error;phot.flux.density;em.opt double nullable first_dec FIRST Declination (FIRST_DEC) degree pos.eq.dec double nullable kmag_error Mean Error in K Magnitude (ALLW_e_Kmag) mag stat.error;phot.mag;em.IR.K double nullable w3_mag AllWISE W3 Magnitude (ALLW_W3mag) mag phot.mag;em.IR.8-15um double nullable sdss_umag SDSS Model Magnitude in u Filter (AB) (SDSS_MODELMAG_u) mag phot.mag;em.opt.U double nullable redshift_dr16_error SDSS Pipeline Redshift Error (DR16_Z_ERR) stat.error;src.redshift double nullable allwise_extent_flag AllWISE Extended Source Flag (ALLW_ex_flg) meta.code char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable