J/A+A/361/491ivo://CDS.VizieR/J/A+A/361/491doi:10.26093/cds/vizier.33610491CDSKahabka P.Puzia T.H.Pietsch W.2001-06-02T08:29:48Z2001-06-02T08:29:35ZCDS support team

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

cds-question@unistra.frx-ray-sourcesWe established the catalog of X-ray point sources in the field of the Magellanic-type spiral galaxy NGC 3109 (DDO 236) from two ROSAT PSPC observations. Of the 91 X-ray sources 26 are contained within the HI extent of NGC 3109 as derived by Jobin & Carignan (1990AJ....100..648J) with the VLA. For 10 of these we can determine accurate hardness ratios {delta}HR2<=0.2. We find 3 candidate AGN, 2 candidate X-ray binaries and one source which may belong to either class. We also find 2 candidate foreground stars. In a field of 8'x8' observed with the NTT in the I-b and and centered on the nucleus of NGC 3109 we determine candidates for optical counterparts in the X-ray error circle of 7 ROSAT PSPC sources. We apply a spectral fit to the ROSAT spectrum of the X-ray brightest absorbed candidate AGN behind NGC 3109, RX J1003.2-2607. Assuming a galactic foreground hydrogen column density of 4.3x10^20^cm^-2^ we derive from the X-ray spectral fit, assuming reduced metallicities (~0.2 solar), a hydrogen column density due to NGC 3109 of 11+/-^7^_5_x10^20^cm^-2^. This value is slightly larger than the hydrogen column density derived from the 21-cm observations of ~8x10^20^cm^-2^. We estimate that the molecular mass fraction of the gas is not larger than ~60%.2000A&A...361..491Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/361/491CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/361/491https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/361/491http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/361/491https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/361/491https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/361/491http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/361/491GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/361/491/table6 (ROSAT PSPC X-ray catalog of the NGC 3109 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/361/491/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/361/491/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/361/491/table6?GETtext/xml+votable180.050000true149.900417-26.0888890.0055555555555555566/38841 38843 38846 40209 40212https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/361/491?format=asciiX-raydefaultJ/A+A/361/491/table4Shape parameters of the 5 brightest sources within 90% confidence circle of 6 optically matched ROSAT source coordinates.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource number (1)meta.id;meta.mainintLabelLabel number in the source, in agreement with label in fig. 6 (1)meta.bib.figintImagInstrumental I magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Imagmagstat.errorfloatFWHMFWHMarcsecphys.angSizefloatEllEllipticity (1-a/b)src.ellipticityfloatClass[0/1] Classification star-galaxy (2)src.class.starGalaxyfloatJ/A+A/361/491/table6ROSAT PSPC X-ray catalog of the NGC 3109 fieldHR2Hard hardness ratiophot.flux;arith.ratiofloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLinkShow the 2RXP sources close to this positionmeta.refcharSeqCatalog indexmeta.idintSourceSource numbermeta.id;meta.mainintprimaryn_Source[*] Individual note in file notes.datmeta.notecharRXJRXJ numbermeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maine_Pos90% confidence positional uncertaintyarcsecstat.errorintCRTTotal count ratect/ksphot.count;em.X-rayfloate_CRTrms uncertainty on CRTct/ksstat.errorfloatHR1Soft hardness ratiophot.flux;arith.ratiofloate_HR1rms uncertainty on HR1stat.errorfloate_HR2rms uncertainty on HR2stat.errorfloatLHLikelihood ratio of existencestat.likelihoodintExt? Source extent in cases where the likelihood ratio for extent is greater than 20arcsecphys.angSize;srcintnullableDeltaOff-axis anglearcsecinstr.offsetintJ/A+A/361/491/notesIndividual notes on table6.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource number (repeated if necessary)meta.idintTextText of notemeta.notechar