The X-ray cluster A2142

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Spectroscopy, Galactic Clusters, Radial Velocity, X Ray Sources, X Ray Spectroscopy, Bremsstrahlung, Interstellar Gas, Radiant Flux Density

Scientific paper

Spectroscopic observations are presented for Abell 2142, one of the most luminous known cluster X-ray sources. The cluster's large radial-velocity dispersion, 1241 km/s and X-ray luminosity (3-6 x 10 to the 45th erg/s) agree well with previously suggested velocity dispersion-X-ray luminosity relations. Recent X-ray spectroscopy of A2142 implies an average intracluster gas temperature exceeding 30 keV if the X-rays are produced by thermal bremsstrahlung. All other clusters for which such data are available have intracluster gas temperatures below 20 keV. A2142 therefore provides a test of recent suggestions that the intracluster gas temperature should be proportional to the square of the galaxy velocity dispersion for X-ray emitting clusters. A2142 does not satisfy the predicted relation.

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