J/A+A/370/900ivo://CDS.VizieR/J/A+A/370/900doi:10.26093/cds/vizier.33700900CDSVignali C.Comastri A.Fiore F.La Franca F.2003-11-11T16:30:17Z2003-11-11T17:29:58ZCDS support team

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

cds-question@unistra.frx-ray-sourcesWe present a comprehensive study of the soft X-ray properties of the BeppoSAX High-Energy Large Area Survey (HELLAS) sources. A large fraction (about 2/3) of the hard X-ray selected sources is detected by ROSAT. The soft X-ray colors for many of these objects, along with the 0.5-2keV flux upper limits for those undetected in the ROSAT band, do imply the presence of absorption. The comparison with the ROSAT Deep Survey sources indicates that a larger fraction of absorbed objects among the HELLAS sources is present, in agreement with their hard X-ray selection and the predictions of the X-ray background synthesis models. Another striking result is the presence of a soft (additional) X-ray component in a significant fraction of absorbed objects.2001A&A...370..900Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/370/900CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/362/799 : The BeppoSAX 2-10 keV Survey (Giommi+, 2000)J/MNRAS/327/771 : BeppoSAX HELLAS survey. II. (Fiore+, 2001)J/ApJ/570/100 : BeppoSAX HELLAS survey. V. (La Franca+, 2002)J/MNRAS/342/575 : BeppoSAX HELLAS survey. VI. (Ciliegi+, 2003)J/A+A/409/79 : HELLAS2XMM survey. IV. (Fiore+, 2003)http://argos.mporzio.astro.it/hellas/ :https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/370/900https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/370/900http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/370/900https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/370/900https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/370/900http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/370/900GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/370/900/table1 (HELAS sources detected by ROSAT)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/370/900/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/370/900/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/370/900/table1?GETtext/xml+votable180.050000true25.06125-67.8153330.005555555555555556BeppoSAX6/4992-4993 5367 5437 6021 6069 6073 7642 7664 7896 8066 8603 8922-8923 9613 10151 10977 10979-10980 11614 11856 12025 13314 13411 15090 16655 16666 16794 17754 19283 19619 20071 20286 22977 25742 26022 26131 26148 28471 28517 31158 31509 33378 33635 34023 34032 34104 34531 34534 39479 40410 43828 43876 46399 46987 49048https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/370/900?format=asciiX-raydefaultJ/A+A/370/900/table1HELAS sources detected by ROSATRORROR numbermeta.id;obscharn_HR1[+] +: HRI datameta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHELLASSource identificationmeta.id;meta.maincharRAJ2000right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainClassClassification (1)src.classcharCRCount Rate0.01count.s**-1phot.count;em.X-rayfloate_CRrms uncertainty on CD0.01count.s**-1stat.errorfloatF0-5-2keVFlux at 0.5-2keV1e-16W.m**-2phot.flux;em.X-rayfloatHR1? Hardness ratio 1 (2)phot.flux;arith.ratiofloatnullablee_HR1? rms uncertainty on HR1stat.errorfloatnullableHR2? Hardness ratio 2 (2)phot.flux;arith.ratiofloatnullablee_HR2? rms uncertainty on HR2stat.errorfloatnullablen_HR2[+] +: HRI datameta.notecharOff-axis? Off-axis anglearcmininstr.offsetfloatnullablen_Off-axis[++ ] ++: RASSmeta.notecharTexpExposure timekstime.duration;obs.exposurefloatNHgal? Galactic hydrogen column density from Dickey & Lockman (1990ARA&A..28..215D)1e+20cm**-2phys.columnDensityfloatnullable