XMM/M31 ivo://nasa.heasarc/m31xmmxray NASA/GSFC HEASARC Pietsch, Freyberg, Haberl; Stiele, Pietsch, Haberl, Freyberg 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a source catalog based on XMM-Newton observations of the bright Local Group spiral galaxy M 31. In an analysis of XMM archival observations of M 31, the authors studied the population of X-ray sources (X-ray binaries, supernova remnants) down to a 0.2-4.5 keV luminosity of 4.4 x 10<sup>34</sup> erg/s. EPIC hardness ratios and optical and radio information were used to distinguish between different source classes. The survey detected 856 sources in an area of 1.24 square degrees. The authors correlated their sources with earlier M 31 X-ray catalogs and used information from optical, infra-red and radio wavelengths. As sources within M 31, they detected 21 supernova remnants (SNR) and 23 SNR candidates, 18 supersoft source (SSS) candidates, 7 X-ray binaries (XRBs) and 9 XRB candidates, as well as 27 globular cluster sources (GlC) and 10 GlC candidates, which most likely are low mass XRBs within the GlC. Comparison to earlier X-ray surveys revealed transients not detected with XMM-Newton, which add to the number of M 31 XRBs. There are 567 sources classified as hard, which might either be XRBs or Crab-like SNRs in M 31 or background AGN. The number of 44 SNRs and candidates more than doubles the X-ray-detected SNRs. 22 sources are new SNR candidates in M 31 based on X-ray selection criteria. Another SNR candidate might be the first plerion detected outside the Galaxy and the Magellanic Clouds. On the other hand, six sources are foreground stars and 90 are foreground star candidates, one is a BL Lac-type active galactic nucleus (AGN) and 36 are AGN candidates, one source coincides with the Local Group galaxy M 32, one with a background galaxy cluster (GCl) and another is a GCl candidate, all sources which are not connected with M31. In a second paper, the authors presented an extension to the original 2005 XMM-Newton X-ray source catalog of M 31 which contained 39 newly found sources. These sources have been added to the original 856 sources to make a combined catalog of 895 X-ray sources which is contained herein. This table was originally created by the HEASARC in May 2005 based on the CDS table J/A+A/434/483/ file table2.dat (sources numbered 1 to 856). It was updated by the HEASARC in June 2008 by adding the 39 sources from the CDS table J/A+A/480/599/ file table3.dat (sources numbered 857 to 895). This is a service provided by NASA HEASARC . 2008A&A...480..599S https://heasarc.gsfc.nasa.gov/W3Browse/all/m31xmmxray.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=m31xmmxray& GET text/xml 180 99999 true 10.02629167 40.40263889 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=m31xmmxray GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_m31xmmxray&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 X-ray public m31xmmxray XMM-Newton M 31 Survey Source Catalog name Source Designation 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 error_radius Positional Error (arcsec) arcsec stat.error;pos double nullable count_rate Combined EPIC Count Rate (ct/s) ct/s phot.count;em.X-ray double nullable count_rate_error Error in Combined EPIC Count Rate (ct/s) ct/s stat.error;phot.count;em.X-ray double nullable flux Combined EPIC Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable det_ml Source Detection Likelihood (Combined EPIC) stat.likelihood;em.X-ray double nullable hr3 Combined EPIC Hardness Ratio 3 phot.count;arith.ratio;em.X-ray double nullable hr2_error Error in Combined EPIC Hardness Ratio 2 stat.error;phot.count;arith.ratio;em.X-ray double nullable m1_hr2 EPIC MOS1 Hardness Ratio 2 phot.count;arith.ratio;em.X-ray double nullable offset_usno_xmm Distance of Source USNO-B1.0 (arcsec) arcsec pos.angDistance;em.X-ray;em.opt double nullable hr1_error Error in Combined EPIC Hardness Ratio 1 stat.error;phot.count;arith.ratio;em.X-ray double nullable m1_flux EPIC MOS1 Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable hr3_error Error in Combined EPIC Hardness Ratio 3 stat.error;phot.count;arith.ratio;em.X-ray double nullable m2_flux_error Error in EPIC MOS2 Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable m1_hr4 EPIC MOS1 Hardness Ratio 4 phot.count;arith.ratio;em.X-ray double nullable pn_count_rate EPIC pn Count Rate ct/s phot.count;em.X-ray double nullable pn_flux_error Error in EPIC pn Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable m2_hr1 EPIC MOS2 Hardness Ratio 1 phot.count;arith.ratio;em.X-ray double nullable m2_hr1_error Error in MOS2 Hardness Ratio 1 stat.error;phot.count;arith.ratio;em.X-ray double nullable m2_count_rate_error Error in EPIC MOS2 Count Rate (ct/s) ct/s stat.error;phot.count;em.X-ray double nullable m1_count_rate_error Error in EPIC MOS1 Count Rate (ct/s) ct/s stat.error;phot.count;em.X-ray double nullable pn_flux EPIC pn Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable m2_hr3 EPIC MOS2 Hardness Ratio 3 phot.count;arith.ratio;em.X-ray double nullable m1_det_ml EPIC MOS1 Source Detection Likelihood stat.likelihood;em.X-ray double nullable m2_flux EPIC MOS2 Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable imag I Magnitude of USNO-B1.0 Source mag phot.mag;em.opt.I double nullable r2_mag R2 Magnitude of USNO-B1.0 Source mag phot.mag;em.opt.R double nullable hr2 Combined EPIC Hardness Ratio 2 phot.count;arith.ratio;em.X-ray double nullable bii Galactic Latitude degree pos.galactic.lat double nullable m1_count_rate EPIC MOS1 Count Rate (ct/s) ct/s phot.count;em.X-ray double nullable hr4_error Error in Combined EPIC Hardness Ratio 4 stat.error;phot.count;arith.ratio;em.X-ray double nullable m1_hr3 EPIC MOS1 Hardness Ratio 3 phot.count;arith.ratio;em.X-ray double nullable alt_xray_id1 Alternative X-Ray Identification #1 meta.id char nullable source_type Classification of X-ray Source src.class char nullable pn_hr4 EPIC pn Hardness Ratio 4 phot.count;arith.ratio;em.X-ray double nullable usno_cat_name Designation of Brightest USNO-B1.0 Source within Search Area meta.id char nullable lii Galactic Longitude degree pos.galactic.lon double nullable m2_exposure Exposure of EPIC MOS2 Instrument (s) s time.duration;obs.exposure double nullable m1_hr1 EPIC MOS1 Hardness Ratio 1 phot.count;arith.ratio;em.X-ray double nullable pn_exposure Exposure of EPIC pn Instrument (s) s time.duration;obs.exposure double nullable b2_mag B2 Magnitude of USNO-B1.0 Source mag phot.mag;em.opt.B double nullable pn_hr3_error Error in pn Hardness Ratio 3 stat.error;phot.count;arith.ratio;em.X-ray double nullable hr4 Combined EPIC Hardness Ratio 4 phot.count;arith.ratio;em.X-ray double nullable pn_det_ml EPIC pn Source Detection Likelihood stat.likelihood;em.X-ray double nullable pn_hr3 EPIC pn Hardness Ratio 3 phot.count;arith.ratio;em.X-ray double nullable m2_hr2 EPIC MOS2 Hardness Ratio 2 phot.count;arith.ratio;em.X-ray double nullable field_code Code of the Detection Field in Which the Source Was Entered in the Catalog meta.code char nullable m1_hr4_error Error in MOS1 Hardness Ratio 4 stat.error;phot.count;arith.ratio;em.X-ray double nullable m2_hr4_error Error in MOS2 Hardness Ratio 4 stat.error;phot.count;arith.ratio;em.X-ray double nullable pn_hr4_error Error in pn Hardness Ratio 4 stat.error;phot.count;arith.ratio;em.X-ray double nullable alt_xray_id3 Alternative X-Ray Identification #3 meta.id char nullable m2_hr4 EPIC MOS2 Hardness Ratio 4 phot.count;arith.ratio;em.X-ray double nullable other_remarks Additional Remarks meta.note char nullable class Browse Object Classification src.class short nullable m1_hr3_error Error in MOS1 Hardness Ratio 3 stat.error;phot.count;arith.ratio;em.X-ray double nullable m2_hr3_error Error in MOS2 Hardness Ratio 3 stat.error;phot.count;arith.ratio;em.X-ray double nullable pn_hr1_error Error in pn Hardness Ratio 1 stat.error;phot.count;arith.ratio;em.X-ray double nullable alt_xray_id_others Additional Alternative X-Ray Identifications meta.id char nullable alt_name Alternative Source Designation meta.id char nullable alt_xray_id2 Alternative X-Ray Identification #2 meta.id char nullable pn_hr2_error Error in pn Hardness Ratio 2 stat.error;phot.count;arith.ratio;em.X-ray double nullable flux_error Error in Combined Epic Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable pn_count_rate_error Error in EPIC pn Count Rate ct/s stat.error;phot.count;em.X-ray double nullable number_usno_corr Number of USNO-B1.0 Correlations meta.code short nullable log_fx_fopt Logarithm of X-Ray-to-Optical Fluxes phot.flux;arith.ratio;em.X-ray;em.opt double nullable m1_hr2_error Error in MOS1 Hardness Ratio 2 stat.error;phot.count;arith.ratio;em.X-ray double nullable m2_hr2_error Error in MOS2 Hardness Ratio 2 stat.error;phot.count;arith.ratio;em.X-ray double nullable m1_exposure Exposure of EPIC MOS1 Instrument (s) s time.duration;obs.exposure double nullable m1_hr1_error Error in MOS1 Hardness Ratio 1 stat.error;phot.count;arith.ratio;em.X-ray double nullable m1_flux_error Error in EPIC MOS1 Flux (erg/s/cm^2) erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable hr1 Combined EPIC Hardness Ratio 1 phot.count;arith.ratio;em.X-ray double nullable pn_hr2 EPIC pn Hardness Ratio 2 phot.count;arith.ratio;em.X-ray double nullable m2_count_rate EPIC MOS2 Count Rate (ct/s) ct/s phot.count;em.X-ray double nullable det_instruments EPIC Instruments Contributing to Source Detection meta.code char nullable pn_hr1 EPIC pn Hardness Ratio 1 phot.count;arith.ratio;em.X-ray double nullable m2_det_ml EPIC MOS2 Source Detection Likelihood stat.likelihood;em.X-ray double 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