Velocities of head-tail radio galaxies with respect to the intercluster medium

Details Velocities of head-tail radio galaxies with respect to the intercluster medium Velocities of head-tail radio galaxies with respect to the intercluster medium

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..422u&link_type=abstract

Astrophysical Journal, Part 1, vol. 221, Apr. 15, 1978, p. 422, 423, 425 (7 ff.).

Astronomy and Astrophysics

Astronomy

36

Astronomical Photometry, Galactic Clusters, Intergalactic Media, Radio Astronomy, Radio Galaxies, Astronomical Maps, Background Radiation, Galactic Structure, Radial Velocity

Scientific paper

In four clusters of galaxies having a head-tail radio galaxy, the dispersion of the velocities of the galaxies (sigma), and the difference between the velocity of the head-tail radio galaxy and the mean velocity of the cluster (delta V) have been measured. The four clusters are (1) A1452; (2) A2250; (3) a very small medium compact cluster surrounding the radio galaxy B2 1615+35, which has a tail 390 kpc long assuming H = 100 km/s per Mpc; and (4) a poor group surrounding the short tail radio galaxy B2 1621+38. In these four clusters the velocity of the head-tail radio galaxy is not exceptionally high. The generality of this result is examined by analyzing the distribution of delta V/sigma among the 16 head-tail sources for which delta V and sigma are known. It is found that the distribution of delta V/sigma is consistent with a normal distribution and is therefore not significantly different from the distribution of delta V/sigma that is expected for a set of 16 galaxies selected at random in their respective clusters.

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