Volume 483, Number 1, May III 2008
|Page(s)||15 - 18|
|Section||Cosmology (including clusters of galaxies)|
|Published online||04 March 2008|
Testing power-law cosmology with galaxy clusters
Department of Astronomy, Beijing Normal University, Beijing 100875, PR China e-mail: firstname.lastname@example.org
2 Institut d'Astrophysique Spatiale (IAS), CNRS & Univ. Paris-Sud, Bâtiment 121, 91405 Orsay, France
3 Departamento de Astronomia, Observatório Nacional, 20921-400, Rio de Janeiro, Brasil e-mail: email@example.com
4 Instituto Nacional de Pesquisas Espaciais/CRN, 59079-740, Natal-RN, Brazil
5 The College of Applied Science, Beijing University of Technology, Beijing 100022, PR China
Accepted: 20 December 2007
Aims. Power-law cosmologies, in which the cosmological scale factor evolves as a power law in time, with , regardless of the matter content or cosmological epoch, is comfortably concordant with a host of cosmological observations.
Methods. In this article, we use recent measurements of the X-ray gas mass fractions in clusters of galaxies to constrain the α parameter with curvature .
Results. We find that the best fit happens for an open scenario with the power index ± 0.05, though the flat and closed model cannot be ruled out with high confidence.
Conclusions. Our results are in agreement with other recent analyses and show that the X-ray gas mass fraction measurements in clusters of galaxies provide a complementary test of the power-law cosmology.
Key words: cosmological parameters / cosmology: theory / X-rays: galaxies: clusters
© ESO, 2008
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