The hard X-ray spectrum of soft X-ray-selected AGN
نویسندگان
چکیده
منابع مشابه
Cumulative hard X - ray spectrum of local AGN : a link to the cosmic X - ray background
Aims. We determine the cumulative spectral energy distribution of local AGN in the range 3–300 keV and compare it with the spectrum of the cosmic X-ray background (CXB) in order to test the widely accepted paradigm that the CXB is a superposition of active galactic nuclei (AGN) and to place constraints on AGN evolution. Methods. We perform a stacking analysis of the hard X-ray spectra of AGN de...
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We present ROSAT All-Sky Survey and ROSAT pointed observations (PSPC and HRI) of a complete sample of 113 bright soft X-ray AGN selected from the ROSAT Bright Source Catalog. We compare these observations in order to search for extreme cases of flux and spectral X-ray variability-X-ray transient AGN. Three definite transients and one transient candidate are found. The other sources show amplitu...
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We present results of an infrared-to-X-ray study of 76 bright soft X-ray selected Seyfert galaxies discovered in the ROSAT All-Sky Survey. These objects are characterized by steep X-ray spectra in the 0.2-2.0 keV bandpass with power law energy spectral indices in the range of 1.3 to 8 and a lack of internal absorption by neutral hydrogen. Our sample selection based on hardness ratio yields a me...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1998
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.1998.01629.x