Evolution of clusters of galaxies and the ROSAT All Sky Survey

Details Evolution of clusters of galaxies and the ROSAT All Sky Survey Evolution of clusters of galaxies and the ROSAT All Sky Survey

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252l..23p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. L23-L26.

Astronomy and Astrophysics

Astronomy

4

Galactic Clusters, Galactic Evolution, Luminous Intensity, Rosat Mission, Sky Surveys (Astronomy), Cosmology, Dark Matter, Intergalactic Media, Red Shift, X Ray Astronomy

Scientific paper

Predictions are presented for the redshift distribution of clusters of galaxies in the Rosat All Sky Survey. The cluster population is modeled according to the recent determinations of the local temperature and luminosity functions by Edge et al. (1991) and its evolution following a modified formulation of the self-similar approximation. This solution, which assumes preheating of the intergalactic medium, was proposed by Kaiser (1991) in order to account for the strong negative evolution revealed by the Einstein and Exosat data. The simulations show a conspicuous difference in the redshift distribution between models characterized by indices of the initial fluctuation spectrum n = -1, n = -2 or no evolution (n = about -0.5). For the most likely - as suggested by the optical data - CDM-type index n = -1, a total of about 20 clusters should be detected between redshifts of 0.4-0.7 in a 10-degree-radius field centered on the North ecliptic pole where the survey sensitivity is maximum. At the mean sensitivity of the survey the most distant objects detectable should have a redshift around 0.4.

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