The m-t_x relation for clusters of galaxies

Details The m-t_x relation for clusters of galaxies The m-t_x relation for clusters of galaxies

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998newar..42..145h&link_type=abstract

New Astronomy Reviews, Volume 42, Issue 2, p. 145-148.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

If clusters of galaxies are self-similar and the intracluster gas is in global quasi-equilibrium with the dark matter, a tight relation between mass and X-ray temperature is expected in most cosmological models. We here calibrate this relation using 8 clusters with well-defined global temperatures measured with ASCA and masses inferred from gravitational lensing. The surface lensing masses are deprojected in accordance with N-body simulations and analytic results. The data are well-fitted by the theoretical mass-temperature relation and are consistent with the empirical normalisation found in gasdynamic simulations. As there is no discrepancy between the lensing and X-ray derived masses this approach could lead to a powerful and expedient way of measuring masses of clusters of galaxies. Constraints on N(z) and Lambda can also be obtained by studying high-redshift cluster lenses.

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