ROSAT PSPC M 31 Source Catalog

ROSAT PSPC M 31 Source Catalog ROSAT/M31 ivo://nasa.heasarc/m31rosxray NASA/GSFC HEASARC Supper et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This catalog is the complete ROSAT PSPC Source List of X-ray sources found in two surveys of M 31 reported by Supper et al. (1997, 2001). These papers reported the results of the analysis of the two ROSAT PSPC surveys of M 31 performed in the summers of 1991 and 1992, respectively. summer 1992. Supper et al. (2001) compare and combine the results from the two surveys. In the first survey, 396 X-ray point sources were detected, and an identical number in the second survey, although this equality is coincidental, as the source lists are different and contain only 239 sources in common. Within the approximately 10.7 square degrees field of view of the second survey, 396 individual X-ray sources were detected, of which 164 sources were new detections. When combined with the first survey, this resulted in a total of 560 X-ray sources in the field of M 31. Their (0.1 keV-2.0 keV) fluxes range from 7 x 10-15 to 7.6 x 10-12 erg cm-2 s-1, and of these 560 sources, 55 are tentatively identified with foreground stars, 33 with globular clusters, 16 with supernova remnants, and 10 with radio sources and galaxies (including M 32). A comparison with the results of the Einstein M 31 survey reveals 491 newly detected sources, 11 long-term variable sources, and 7 possible transient sources. Comparing the two ROSAT surveys, Supper et al. come up with 34 long-term variable sources and 8 transient candidates. For the M 31 sources, the observed X-ray luminosities range from 4 x 1035 to 4 x 1038 erg s-1. The total (0.1 keV-2.0 keV) luminosity of M 31 is (3.4 +/- 0.3) x 1039 erg s-1, distributed approximately equally between the bulge and disk. Within the bulge region, the luminosity of a possible diffuse component combined with faint sources below the detection threshold is (2.0 +/- 0.5) x 1038 erg s-1. An explanation in terms of hot gaseous emission leads to a maximum total gas mass of (1.0 +/- 0.3) x 106 solar masses. The conversion of PSPC count rates into X-ray fluxes depends on the assumed spectral shape. For M 31-sources, a power law with photon index of -2.0 and an intervening column density pf 9 x 1020 H atoms cm-2 may be used, leading to the conversion factor of 1 ct/ksec = 3.00 x 10-14 erg cm-2 s-1 in the 0.1-2.0 keV broad band. For foreground stars, the application of this conversion factor leads to an over-estimate of the fluxes. This online catalog was created by the HEASARC in October 2001 based on machine-readable tables obtained from the ADC/CDS data centers (their catalog J/A+A/373/63, and table table6.dat). This is a service provided by NASA HEASARC . 2001A&A...373...63S https://heasarc.gsfc.nasa.gov/W3Browse/all/m31rosxray.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=m31rosxray& GET text/xml 180 99999 true 9.99208333 39.4925 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=m31rosxray GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_m31rosxray&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.0333333333333333 X-ray public m31rosxray ROSAT PSPC M 31 Source Catalog name RXJ Source 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 error_radius 1-Sigma Positional Error arcsec stat.error;pos short nullable rate_b_flag Limit Flag on Broad Rate char nullable rate_b Count Rate 0.1-2.0 keV ct/s double nullable rate_b_error 1-Sigma Error in Broad Rate ct/s double nullable s2_number Source Number in This Second Survey short nullable lii Galactic Longitude degree pos.galactic.lon double nullable survey_flag Marker of Data Identification [+-] char nullable rate_h2_error 1-Sigma Error in Hard2 Rate ct/s double nullable rate_h1_flag Limit Flag on Hard1 Rate char nullable rate_h1 Count Rate 0.5-0.9 keV ct/s double nullable bii Galactic Latitude degree pos.galactic.lat double nullable rate_s_error 1-Sigma Error in Soft Rate ct/s double nullable einstein_flag Flag Indicates Source Correlated with Einstein char nullable max_likelihood Likelihood of Detection double nullable quality_flag Quality Class (1=Best, 4=Worst) short nullable rate_h2_flag Limit Flag on Hard2 Rate char nullable rate_h1_error 1-Sigma Error in Hard1 Rate ct/s double nullable s1_number Source Number in First Survey short nullable rate_s Count Rate 0.1-0.4 keV ct/s double nullable rate_h2 Count Rate 0.9-2.0 keV ct/s double nullable source_flag Source Classification Flag char nullable rate_s_flag Limit Flag on Soft Rate char nullable rate_h Count Rate 0.5-2.0 keV ct/s double nullable class Browse Object Classification src.class short nullable rate_h_flag Limit Flag on Hard Rate char nullable rate_h_error 1-Sigma Error in Hard Rate ct/s 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