A spectroscopic study of NGC 6251 and its companion galaxies |
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| Authors: | P N Werner D M Worrall M Birkinshaw |
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| Institution: | Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL |
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| Abstract: | 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 and a line-of-sight velocity dispersion of z =283(+109,52) km s1. 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 +N ii ], but there is no evidence for line emission from the jet (detected in optical continuum by Keel). |
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| Keywords: | galaxies: clusters: individual: Zw 1609 0+8212 galaxies: distances and redshifts galaxies: individual: NGC 6251 |
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