Constraints on cosmological parameters by the X-ray luminosity and temperature functions of galaxy clusters

Del Popolo A., Ercan E.

BALTIC ASTRONOMY, vol.14, no.4, pp.571-575, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 4
  • Publication Date: 2005
  • Title of Journal : BALTIC ASTRONOMY
  • Page Numbers: pp.571-575


In this paper we revisit the constraints obtained by several authors on the estimated values of Omega(m), the effective index of the mass density fluctuation spectrum on cluster scales, n, and sigma(8) in the light of recent theoretical developments: (1) new theoretical mass functions; (2) a more accurate mass-temperature relation, also determined for arbitrary Omega(m) and Omega(Lambda). First, using the quoted improvements, we re-derive an expression for the X-ray Luminosity Function (XLF), and then we get some constraints to Omega(m) and n, by using the ROSA T BCS and EMSS samples and maximum-likelihood analysis. Then we re-derive the X-ray Temperature Function (XTF), re-obtaining the constraints on Omega(m), n and sigma(8). Both in the case of the XLF and XTF, the changes in the mass function and M-T relation produces an increase in Omega(m) of similar or equal to 20% and similar results in us and n.