Cosmological constraints from the X-ray luminosity function of the ROSAT Brightest Cluster Sample

Details Cosmological constraints from the X-ray luminosity function of the ROSAT Brightest Cluster Sample Cosmological constraints from the X-ray luminosity function of the ROSAT Brightest Cluster Sample

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.1303e&link_type=abstract

American Astronomical Society, HEAD meeting #4, #13.03; Bulletin of the American Astronomical Society, Vol. 31, p.710

Mathematics

Logic

Scientific paper

The ROSAT Brightest Cluster Sample (BCS) is the largest X-ray selected and X-ray flux limited cluster sample compiled to date. In 1997 we modelled the X-ray luminosity function (XLF) of the 197 BCS clusters with fluxes higher than 4.4 x 10(-12) erg s(-1) cm(-2) (0.1-2.4 keV) and redshifts less than z=0.3 with a simple Schechter function model and found no signs of significant evolution out to z~ 0.2. Using an extended sample of 300 clusters with fluxes higher than 2.8 x 10(-12) erg s(-1) cm(-2) we now investigate the cosmological implications of this lack of evolution by fitting to our data a more physical XLF model based on the Press-Schechter mass function. Thanks to the, by X-ray cluster standards, large size of our sample we are able to constrain simultaneously all three fit parameters Omega_0 , sigma_8 , and n (the density parameter, the dispersion of the primordial mass fluctuation spectrum on the scale of 8 Mpc, and the power law slope of the mass power spectrum on cluster scales). Our best fit value of Omega_0 =0.37(+0.11}_{-0.10) (1sigma ) is consistent with other recent measurements and adding to the growing evidence in support of a low-density universe. A non-zero cosmological constant is not ruled out by our data which are equally well fit by a flat world model with an only slightly higher value of Omega_0 .

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