The ROSAT Deep Survey II. Optical identification, photomettry and spectra of sources in the Lockman field

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dc.creatorSchmidt, Maarten
dc.creatorHasinger, Guenther
dc.creatorGunn, James
dc.creatorSchneider, Don
dc.creatorBurg, Richard
dc.creatorGiacconi, Riccardo
dc.creatorLehmann, Ingo
dc.creatorMacKenty, John
dc.creatorTruemper, Joachim
dc.creatorZamorani, Gianni
dc.date1997-09-15
dc.date.accessioned2026-07-07T06:31:46Z
dc.date.available2026-07-07T06:31:46Z
dc.descriptionThe ROSAT Deep Survey includes a complete sample of 50 X-ray sources with fluxes in the $0.5 - 2$ keV band larger than 5.5 $10^{-15}$ erg cm$^{-2}$ s$^{-1}$ in the Lockman field (Hasinger et al., Paper I). We have obtained deep broad-band CCD images of the field and spectra of many optical objects near the positions of the X-ray sources. We define systematically the process leading to the optical identifications of the X-ray sources. For this purpose, we introduce five identification (ID) classes that characterize the process in each case. Among the 50 X-ray sources, we identify 39 AGNs, 3 groups of galaxies, 1 galaxy and 3 galactic stars. Four X-ray sources remain unidentified so far; two of these objects may have an unusually large ratio of X-ray to optical flux. Keywords: surveys -- galaxies: active -- quasars: emission lines -- galaxies: Seyfert -- X-rays: galaxies
dc.descriptionAccepted to A&A, 10 pages, a LaTeX text, 7 postscript figures, psfig and l-aa.sty are tar'd, gzip'ed and uuencoded
dc.identifierhttps://arxiv.org/abs/astro-ph/9709144
dc.identifierhttp://arxiv.org/abs/astro-ph/9709144
dc.identifierAstron.Astrophys. 329 (1998) 495-503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98707
dc.subjectAstrophysics
dc.titleThe ROSAT Deep Survey II. Optical identification, photomettry and spectra of sources in the Lockman field
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