Cosmological Implications of the Fundamental Relations of X-ray Clusters

Details Cosmological Implications of the Fundamental Relations of X-ray Clusters Cosmological Implications of the Fundamental Relations of X-ray Clusters

1999-05-07

arxiv.org/abs/astro-ph/9905083v1

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures. To be published in ApJ Letters

Scientific paper

10.1086/312091

Based on the two-parameter family nature of X-ray clusters of galaxies obtained in a separate paper, we discuss the formation history of clusters and cosmological parameters of the universe. Utilizing the spherical collapse model of cluster formation, and assuming that the cluster X-ray core radius is proportional to the virial radius at the time of the cluster collapse, the observed relations among the density, radius, and temperature of clusters imply that cluster formation occurs in a wide range of redshift. The observed relations favor the low-density universe. Moreover, we find that the model of $n\sim -1$ is preferable.

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