Large-scale structure of the universe - Constraints from the X-ray background

Details Large-scale structure of the universe - Constraints from the X-ray background Large-scale structure of the universe - Constraints from the X-ray background

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327...25m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 1, 1988, p. 25-33.

Statistics

Computation

17

Astronomical Models, Cosmology, Galactic Clusters, Red Shift, X Ray Sources, Background Radiation, Computational Astrophysics, Fluctuation Theory, Heao 1, Universe

Scientific paper

The HEAO-1 limits on the intensity fluctuations of the hard X-ray background are used to impose limits on the large-scale structure of the universe at large redshifts. It is found that if the present-day structures are extrapolated backward maintaining an approximately constant physical separation between structures, then either the universe is much less structured at z greater than 0.5 or else the sources of the X-ray background do not follow the matter distribution. Alternatively, if the present-day structures are extrapolated backward maintaining an approximately constant comoving separation between structures, then the sources of the X-ray background may follow the matter clustering beyond z greater than 0.5. In this case, for Omega(0) less than 1, the fluctuations due to clustering are less than the observed upper limit, but for Omega(0) = 1 they produce fluctuations close to this upper limit.

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