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Properties of quasars from large X-ray surveys

✍ Scribed by W. Brinkmann


Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
61 KB
Volume
320
Category
Article
ISSN
0004-6337

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What can be learnt from extragalactic X-
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## Abstract Extragalactic X‐ray surveys reveal many Active Galactic Nuclei (AGN) as well as clusters and groups of galaxies. Many of the AGN are obscured, leading to the hard spectrum of the X‐ray Background. Constraints from the absorptioncorrected X‐ray Background spectrum and the local mass dens