Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-03
Mon.Not.Roy.Astron.Soc. 317 (2000) 105
Astronomy and Astrophysics
Astrophysics
7 pages, 2 figures, to be published in MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03687.x
Measurements of the velocities of galaxies thought to be associated with the giant radio galaxy NGC 6251 confirm the presence of a poor cluster with a systemic redshift of z= 0.0244 +/- 0.0004 and a line-of-sight velocity dispersion of sigma_{z}= 283 (+109, -52) km/s. This suggests a cluster atmosphere temperature of T = 0.7 (+0.6, -0.2) keV, which is not enough to confine the radio jet by gas pressure. The core of NGC 6251 shows strong emission lines of [O III] and H alpha + [N II], but there is no evidence for line emission from the jet (detected in optical continuum by Keel (1988)).
Birkinshaw Mark
Werner P. N.
Worrall Diana Mary
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