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The Fluctuations of the Cosmic X-Ray Background as a Sensitive Tool to the Universal Source Distribution

Published online by Cambridge University Press:  14 August 2015

P. Giommi  and
G. F. Bignami
P. Giommi
Affiliation:
Istituto di Fisica Università - Milano
G. F. Bignami
Affiliation:
Istituto di Fisica Cosmica - CNR - Milano

Extract

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Recent experimental results (Giacconi et al, 79, Tananbaum et al 79) ascribe an increasingly important role to the contribution of discrete sources to the low-energy (few Kev) cosmic X-ray background (CXB). While the astrophysical nature of the objects involved is not yet clear, distant and powerful emitters like QSO play probably an important role (e.g. Setti and Woltjer 1979, Field 1980). For them, often the number-flux curve (LogN-LogS) provides useful hints on such properties as space distribution and/or evolution. For the case of the X-ray sources, moreover, a definite relation exists between their LogN-LogS and the granularity of the sky emission as described by the fluctuations of the X-ray background.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 94: Origin of Cosmic Rays , 1981 , pp. 277 - 278
Copyright
Copyright © Reidel 1981 

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