J/PASJ/53/445ivo://CDS.VizieR/J/PASJ/53/445doi:10.26093/cds/vizier/bj-1n-dxCDSIshisaki Y.Ueda Y.Yamashita A.Ohashi T.Lehmann I.Hasinger G.2026-03-17T20:04:07Z2005-04-22T14:15:36ZCDS support team

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

cds-question@unistra.frx-ray-sourcesactive-galactic-nucleiWe present the results of deep observations of the Lockman Hole field with the ASCA SIS, covering 926arcmin^2^ in the 1-7keV energy range, with a sensitivity 3-5 times deeper than the previous ASCA larger area surveys. Utilizing the results of the ROSAT Ultra Deep survey, we have detected 32, 25, and 15 sources in the 1-7, 1-2, and 2-7keV bands, and only 4, 4, and 1 sources remain unidentified, respectively. The average hardness of the sources detected in the 1-7keV band with fluxes of between 10^-14^ and 10^-13^erg/cm^2^/s corresponds to a photon index of 1.65+/-0.10. Type-2 AGNs show significantly harder spectra than type-1s, which can be explained by absorption column densities of N_H_~10^22-23^cm^-2 at the source redshifts. Fifteen sources are detected in the hard-band (2-7keV), consisting of six type-1 AGNs, six type-2 AGNs, one star, one cluster of galaxies, and one unidentified source. Type-2 AGNs make up a major part of hard X-ray populations in the 2-7keV band at a flux level of 3x10^-14^erg/cm^2^/s (2-7 keV). The redshift distributions of type-1 and type-2 AGNs suggest a lack of high luminosity (optically-defined) type-2 AGNs with intrinsic N_H_<10^23^cm^-2, n the redshift range z~1-2 and/or with intrinsic luminosities larger than 3x10^44^erg/s (2-10keV at source frame).2001PASJ...53..445Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/53/445CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/371/833 : ROSAT Ultra Deep Survey (Lehmann+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/53/445https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/53/445http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/53/445https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/53/445https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/53/445http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/53/445GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASJ/53/445/table2 (ASCA properties of the X-ray sources in the Lockman Hole Field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASJ/53/445/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/PASJ/53/445/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASJ/53/445/table2?GETtext/xml+votable180.050000true163.58857.4290.005555555555555556ASCA6/6069https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASJ/53/445?format=asciiX-raydefaultJ/PASJ/53/445/table2ASCA properties of the X-ray sources in the Lockman Hole FieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.int[IUY2001]Sequential numberintn_[IUY2001][* ] **: variable sourcecharRA2000Right ascension (2000)degpos.eq.ra;meta.mainDE2000Declination (2000)degpos.eq.dec;meta.mainz? Redshiftfloatnullablen_z[+ ] ++: Photometric redshift from Lehmann et al., 2001, Cat. <J/A+A/371/833>)charClassClassification (1)charOthClassClassification from other works (2)charl_F1-7keVLimit flag on F1-7keVcharF1-7keVX-flux at 1-7keV, in 10^-13^erg/s/cm^2^ (3)1e-16W.m**-2floate_F1-7keV? rms uncertainty on F1-7keV1e-16W.m**-2floatnullablel_F1-2keVLimit flag on F1-2keVcharF1-2keVX-flux at 1-2keV, in 10^-13^erg/s/cm^2^ (3)1e-16W.m**-2floate_F1-2keV? rms uncertainty on F1-2keV1e-16W.m**-2floatnullablel_F2-7keVLimit flag on F2-7keVcharF2-7keVX-flux at 2-7keV, in 10^-13^erg/s/cm^2^ (3)1e-16W.m**-2floate_F2-7keV? rms uncertainty on F2-7keV1e-16W.m**-2floatnullableSF1-7keVDetection significance for 1-7keV band (4)floatSF1-2keVDetection significance for 1-2keV band (4)floatSF2-7keVDetection significance for 2-7keV band (4)floatHRHardness ratio (5)floate_HRrms uncertainty on HRfloat