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X-Ray Background Fluctuations from Discrete Sources with a Varying Density Contrast

Published online by Cambridge University Press:  08 February 2017

Honguang Bi ,
P. Mészáros  and
A. Mészáros
Honguang Bi
Affiliation:
Max-Planck Institut für Astrophysik Garching FRG
P. Mészáros
Affiliation:
Department of Astronomy Pennsylvania State University University Park, PA USA
A. Mészáros
Affiliation:
Dept. of Astronomy and Astrophysics Charles University Prague, Czechoslovakia

Extract

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In two previous publications (Mészáros and Mészáros 1988 “Paper I”; Bagoly, Mészáros, and Mészáros 1988 “Paper II”), we have studied the fluctuations of the X-ray background (XRB) expected if the XRB is produced by discrete sources distributed as galaxies. The distribution of matter was assumed to follow the large-scale structure in the form of spherical clusters (superclusters) or spherical voids. In Paper I the density contrast of XRB sources inside and outside structures was taken to be a step function of constant height, whereas in Paper II we introduced arbitrary density contrasts (independent of redshift) and allowed for a redshift evolution of the luminosity of the sources. This led to predicted angular fluctuations of the XRB, which, when we compared them with the HEAO–1 observational limit (Shafer 1983), allowed us to set limits on the type and density of structures.

Type
IV. Extragalactic Background Radiation and Cosmology
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 416 - 417
Copyright
Copyright © Kluwer 1990 

References

REFERENCES

Mészáros, A. and Mészáros, P. 1988, Ap. J., 327, 25.Google Scholar
Bagoly, Z., Mészáros, A., and Mészáros, P. 1988, Ap. J., 333, 54.Google Scholar
Shafer, R. 1983, Ph.D. thesis, University of Maryland (NASA Tech. Memo. 85029).Google Scholar