J/A+A/317/328ivo://CDS.VizieR/J/A+A/317/328doi:10.26093/cds/vizier.33170328CDSSupper R.Hasinger G.Pietsch W.Truemper J.Jain A.Magnier E.A.Lewin W.H.G.van Paradijs J.1999-07-29T16:28:00Z1999-07-29T16:27:44ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frinfrared-sourcesx-ray-sourcesThis paper reports on results of the analysis of the first M 31 survey with the ROSAT PSPC performed in July 1991. Within the =~ 6.3deg^2^ field of view we detected 396 individual X-ray sources with (0.1keV-2.4keV) fluxes ranging from =~ 5x10^-15^erg/cm^2^/s^ to =~ 4x10^-12^erg/cm^2^/s. Of these 396 sources, 43 have be en tentatively identified with foreground stars, 29 with globular clusters, 17 with supernova remnants, 3 with other galaxies (including M 32), and 3 with radio sources. A detailed analysis of the integral flux distribution of the sources shows that approximately one fifth are likely to be background objects. By comparison with the results of the Einstein M 31 survey, we find 327 newly detected sources, 15 moderately variable sources, 3 bright and 6 faint possible transient sources. For those sources in M 31, the observed luminosities range from =~ 3x10^35^erg/s to =~ 2x10^38^erg/s (at 690kpc). The total (0.1keV-2.4keV) luminosity of M 31 is (2.9+/-0.3)x10^39^erg/s, roughly one third of which is from the bulge and two thirds of which are from the disk. The luminosity of a diffuse component within the bulge region is estimated to be less than 3.2x10^38^erg/s. An explanation in terms of hot gaseous emission leads to a maximum total gas mass of 1.7x10^6^M_{sun}_. We find that the integral luminosity distribution of sources associated with globular clusters is similar to that of the Milky Way. Finally, the results of spectral fits to 56 of the brightest sources are discussed; we classify 15 objects as "supersoft sources" according to their spectral characteristics.1997A&A...317..328Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/317/328CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/317/328https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/317/328http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/317/328https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/317/328https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/317/328http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/317/328GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/317/328/table5 (List of all 396 ROSAT sources found in M31)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/317/328/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/317/328/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/317/328/table5?GETtext/xml+votable180.050000true9.322540.7563890.005555555555555556ROSAThttps://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/317/328?format=asciiX-rayInfrareddefaultJ/A+A/317/328/table5List of all 396 ROSAT sources found in M31recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_ROSATNote on ROSAT source number (1)meta.notecharROSATROSAT source numbermeta.id;meta.mainintRAJ2000Right ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.maine_DEs1 sigma position errorarcsecstat.errorintCl[1/3] Source classification (2)src.classintMaxLMaximum likehoodstat.likelihoodfloatBandEnergy band with highest detection (3)meta.code;instr.bandpasscharl_rateBLimit flag on rate B (4)meta.code.errorcharrateBCount rate in the B-bandct/ksphot.count;em.X-rayfloate_rateB? rms uncertainty on rateB (5)ct/ksstat.errorfloatnullablel_rateSLimit flag on rate S (4)meta.code.errorcharrateSCount rate in the S-bandct/ksphot.count;em.X-rayfloate_rateS? rms uncertainty on rateS (5)ct/ksstat.errorfloatnullablel_rateHLimit flag on rate H (4)meta.code.errorcharrateHCount rate in the H-bandct/ksphot.count;em.X-rayfloate_rateH? rms uncertainty on rateH (5)ct/ksstat.errorfloatnullablel_rateH1Limit flag on rate H1 (4)meta.code.errorcharrateH1Count rate in the H1-bandct/ksphot.count;em.X-rayfloate_rateH1? rms uncertainty on rateH1 (5)ct/ksstat.errorfloatnullablel_rateH2Limit flag on rate H2 (4)meta.code.errorcharrateH2Count rate in the H2-bandct/ksphot.count;em.X-rayfloate_rateH2? rms uncertainty on rateH2 (5)ct/ksstat.errorfloatnullableJ/A+A/317/328/table7Correlations with different data basesIdIdentificationmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintROSAT? ROSAT source numbermeta.idintnullableDataBaseData base with correlations (1)meta.id;meta.datasetcharDist1Distance between sources in arcsecarcsecpos.angDistancefloatDist2? Distance between sources in arcsec (2)arcsecpos.angDistancefloatnullableDist3? Distance between sources in arcsec (2)arcsecpos.angDistancefloatnullableDist1sDistance 1 between sources in sigma (3)pos.distancefloatDist2s? Distance 2 between sources in sigma (3)pos.distancefloatnullableDist3s? Distance 3 between sources in sigma (3)pos.distancefloatnullableTypeType (star, galaxy, SNR, cluster)src.classcharJ/A+A/317/328/table8Spectral fit parameters of 56 bright X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_ROSATNote on ROSAT source number (1)meta.notecharROSATROSAT source numbermeta.id;meta.mainintCirclePhoton collection circle (2)instr.paramfloatCountsNumber of photons used for the fitmeta.numberintNH1? Hydrogen abs. column density for Gamma1e+20cm**-2phys.columnDensityfloatnullableE_NH1? Error in NH1 (upper limit)1e+20cm**-2stat.errorfloatnullablee_NH1? Error in NH1 (lower limit)1e+20cm**-2stat.errorfloatnullableGamma? Power law indexspect.indexfloatnullableE_Gamma? Error in Gamma (upper limit)stat.errorfloatnullablee_Gamma? Error in Gamma (lower limit)stat.errorfloatnullable2_Gamma? Reduced Chi2 for Gammastat.fit.paramfloatnullableNH2? Hydrogen absolute column density for Thermal Bremsstrahlung fit1e+20cm**-2phys.columnDensityfloatnullableE_NH2? Error in NH2 (upper limit)1e+20cm**-2stat.errorfloatnullablee_NH2? Error in NH2 (lower limit)1e+20cm**-2stat.errorfloatnullablekT1? Thermal Bremsstrahlung temperaturekeVphys.temperaturefloatnullableE_kT1? Error in kT1 (upper limit)keVstat.errorfloatnullablee_kT1? Error in kT1 (lower limit)keVstat.errorfloatnullable2_kT1? Reduced Chi2 for kT1stat.fit.paramfloatnullableFit[BT] Spectral fit model indicator (3) B: Black body; T: Thermal plasmameta.notecharNH3? Hydrogen column density for Fit1e+20cm**-2phys.columnDensityfloatnullableE_NH3? Error in NH3 (upper limit)1e+20cm**-2stat.errorfloatnullablee_NH3? Error in NH3 (lower limit)1e+20cm**-2stat.errorfloatnullablekT2? Thermal Plasma/Blackbody temperaturekeVphys.temperaturefloatnullableE_kT2? Error in kT2 (upper limit)keVstat.errorfloatnullablee_kT2? Error in kT2 (lower limit)keVstat.errorfloatnullable2_Fit? Reduced Chi2 for Fitstat.fit.paramfloatnullableJ/A+A/317/328/table6Correlation with the Einstein source catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_ROSAT[*] Note on ROSAT source number (1)meta.notecharROSATROSAT source numbermeta.id;meta.mainintFRSource flux measured by ROSAT (2)0.1fW.m**-2phot.flux;em.X-rayfloate_FRrms uncertainty on FR0.1fW.m**-2stat.errorfloatEinst.Einstein source numbermeta.idintFESource flux measured by Einstein (2)0.1fW.m**-2phot.flux;em.X-rayfloate_FE? rms uncertainty on FE0.1fW.m**-2stat.errorfloatnullableDistDistance between sourcesarcsecpos.angDistancefloatDistsDistance between sources in sigma (3)pos.distancefloatFR/FEROSAT-Eintein source flux ratiophot.flux;arith.ratiofloate_FR/FE? rms uncertainty on FR/FE (4)stat.errorfloatnullableJ/A+A/317/328/table9*Power law fit parameters with fixed NHrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_ROSATNote on ROSAT source number (1)meta.notecharROSATROSAT source numbermeta.id;meta.mainintGammaPower law indexspect.indexfloate_Gammarms uncertainty on Gammastat.errorfloat2_GammaReduced Chi2 for Gammastat.fit.paramfloat