J/MNRAS/327/771ivo://CDS.VizieR/J/MNRAS/327/771doi:10.26093/cds/vizier.73270771CDSFiore F.Giommi P.Vignali C.Comastri A.Matt G.Perola G.C.,La Franca F.Molendi S.Tamburelli F.Antonelli L.A.2024-06-27T20:17:43Z2004-08-02T22:13:56ZCDS support team

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

cds-question@unistra.frx-ray-sourcesThe BeppoSAX High Energy Large Area Survey (HELLAS) has surveyed about 85deg^2^ of sky in the 5-10keV band down to a flux of 4-5x10^-14^erg/cm^2^/s. The source surface density of 16.9+/-6.4deg^2^ at the survey limit corresponds to a resolved fraction of the 5-10keV X-ray background (XRB) of the order of 20-30 per cent. Hardness ratio analysis indicates that the spectra of a substantial fraction of the HELLAS sources (at least one-third) are harder than a {alpha}_E_=0.6 power law. This hardness may be caused by large absorbing columns. The hardness ratio analysis also indicates that many HELLAS sources may have a spectrum more complex than a single absorbed power law. A soft component, superimposed on a strongly cut-off power law, is likely to be present in several sources.2001MNRAS.327..771Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/327/771CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/362/799 : The BeppoSAX 2-10 keV Survey (Giommi+, 2000)J/A+A/370/900 : BeppoSAX HELLAS survey. IV (Vignali+, 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/MNRAS/327/771https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/327/771http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/327/771https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/327/771https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/327/771http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/327/771GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/327/771/table2 (HELLAS sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/327/771/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/327/771/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/327/771/table2?GETtext/xml+votable180.050000true6.652083-19.7369440.005555555555555556BeppoSAX6/5 4095 4992-4993 5367 5437 6020-6021 6069 6112 6141 7550 7642 7664 7896 8066 8072 8103 8603 8845 8922-8923 9613 10151 10198-10199 10977 10979-10980 11029 11218 11540 11614 11683 11856 12025 13314 13411 13414 15090 15334-15335 15339 16383 16655 16666 16794 17754 19281-19283 19395 19617 19619 20071 20286 22976 23322 23413 25245 25742 25790 25906 26022 26028 26131 26148 26292 28471 28517 31155 31158 31509 33378 33635 33812 33814 34023 34032 34104 34531 34534 34881 35690-35691 37513 39477 39479 40432 41209 43828 43876-43877 45741 46130 46399 46987 48614 49048https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/327/771?format=asciiX-raydefaultJ/MNRAS/327/771/table2HELLAS samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA2000Right ascension (2000)pos.eq.ra;meta.mainDE2000Declination (2000)pos.eq.dec;meta.mainOffsetOff-axis anglearcmininstr.offsetfloatF5-10keVFlux at 5-10keV (in 10^-13^erg/cm^2^/s)1e-16W.m**-2phot.flux;em.X-rayfloatS/NSignal to noise ratiostat.snrfloatS-H/S+H? Softness ratio, S-H/S+H (1)phot.flux;arith.ratiofloatnullablee_S-H/S+H? rms uncertainty on S-H/S+Hstat.errorfloatnullablen_S-H/S+H[b] Note on S-H/S+H (2)meta.notecharHR1? Hardness ratio 1, HR1=(M-L)/(M+L) (1)phot.flux;arith.ratiofloatnullablee_HR1? rms uncertainty HR1stat.errorfloatnullablen_HR1[bc] Note on HR1 (2)meta.notecharHR2? Hardness ratio 2, HR2=(H-M)/(H+M) (1)phot.flux;arith.ratiofloatnullablee_HR2? rms uncertainty HR2stat.errorfloatnullablen_HR2[bc] Note on HR2 (2)meta.notecharHELLASIdentification numbermeta.id;meta.mainchar