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What can be learnt from twelve thousand plain films?

✍ Scribed by Hennessy, Martin; Raby, Nigel


Book ID
125826461
Publisher
Elsevier Science
Year
2014
Tongue
English
Weight
43 KB
Volume
69
Category
Article
ISSN
0009-9260

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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