Cosmological constraints on the clustering of X-ray background sources

Details Cosmological constraints on the clustering of X-ray background sources Cosmological constraints on the clustering of X-ray background sources

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333...54b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 1, 1988, p. 54-63.

Astronomy and Astrophysics

Astrophysics

10

Background Radiation, Cosmology, Relic Radiation, X Ray Sources, Astronomical Models, Luminosity, Red Shift

Scientific paper

Further limits on the large-scale clustering of the sources of the X-ray background at redshifts greater than 0.5 are discussed. It is found that for structures of mean present separations around 30 Mpc, the comoving mean density of structures can be constant or may at most grow as the first power of the universal length scale. One can set an upper limit of about a factor of 35 on the luminosity dispersion at a given redshift, if the density of sources is the present estimated lower limit n = 5000 /sq deg or a factor 100 if it is n = 40,000/sq deg. If at z larger than 0.5 there exists a constant comoving number of structures of present mean separations about 60 Mpc and overdensity exceeding a factor of two, then the closure parameter is limited to Omega(0) less than 0.4. Clusterings on larger scales comparable to recently reported complexes or great attractors may not exist at such redshifts unless their filling factor is below about 0.03 percent.

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