Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....74..116h&link_type=abstract
Astronomy and Astrophysics, vol. 74, no. 1, Apr. 1979, p. 116, 117.
Astronomy and Astrophysics
Astrophysics
22
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.
Hintzen Paul
Scott Joshua S.
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