Maximum radial extension of the Coma cluster

Details Maximum radial extension of the Coma cluster Maximum radial extension of the Coma cluster

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..139m&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 2, p. 139-146

Astronomy and Astrophysics

Astronomy

7

Astronomical Models, Dark Matter, Galactic Clusters, Intergalactic Media, Size Determination, X Ray Astronomy, X Ray Sources, X Ray Spectra, Hubble Constant, Hydrostatics, Mass Distribution, Rosat Mission

Scientific paper

We derived the maximum radius of the Coma cluster using its recent X-ray data. Specifically, we assumed that the cluster is spherically symmetric, the gas is in hydrostatic equilibrium, and the mass distribution of the cluster can be expressed by the King model. Requiring that the surface brightness in our model be consistent with the X-ray data, we found that the Coma cluster can extend to 8.6/(h50) Mpc (h50 is the Hubble constant in units of 50 km/(sec Mpc). The total mass of the Coma cluster amounts to 2.0 x 1015/(h50) solar masses. The mass within the Abell radius (3/(h50 Mpc) estimated in a previous study amounts to 80% of the total mass which we derived here. Our model is also applicable to clusters A2255 and A2256, which are morphologically classified into nXD.

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