Optical identification of ROSAT-FSC sources
نویسندگان
چکیده
منابع مشابه
A Survey of hard spectrum ROSAT sources 2: optical identification of hard sources
We have surveyed 188 ROSATPSPC fields for X–ray sources with hard spectra (α < 0.5); such sources must be major contributors to the X–ray background at faint fluxes. In this paper we present optical identifications for 62 of these sources: 28 AGN which show broad lines in their optical spectra (BLAGN), 13 narrow emission line galaxies (NELGs), 5 galaxies with no visible emission lines, 8 cluste...
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We present optical identification and highresolution spectroscopy of ROSAT sources in the field of the old open cluster M 67. For the first time it is possible to analyze coronal and chromospheric activity of active stars in a solar-age cluster, and to compare it with field stars. ROSAT observed the high X-ray luminosity tail of the cluster sources. In agreement with what expected from studies ...
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The ROSAT Deep Survey includes a complete sample of 50X-ray sourceswith fluxes in the 0.5−2 keVband 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 t...
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The ROSAT Deep Survey in the Lockman Hole contains a complete sample of 50 X-ray sources with fluxes in the 0.5-2 keV band larger than 5.5 · 10 erg cm s. Previous work has provided optical identification of 46 of the 50 X-ray sources; over 75 % of the sources are AGNs (Schmidt et al. 1998). We present now the atlas of optical finding charts and the full description of the spectra, including emi...
متن کاملIdentification of a complete sample of northern ROSAT All-sky Survey X-ray sources
In order to derive statistical properties of a complete X-ray selected sample of AGN we used the classification spectra of the RASS Selected Areas-North survey to study the luminosities, redshifts , X-ray/visual flux ratios, line widths, and various correlations between observed parameters of all Seyfert galaxies and QSOs in this sample. On the basis of these data we discuss implications for th...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20053967