Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59...23s&link_type=abstract
Astronomy and Astrophysics, vol. 59, no. 1, July 1977, p. 23-26.
Astronomy and Astrophysics
Astronomy
32
Astronomical Spectroscopy, Galactic Clusters, Radio Astronomy, Radio Sources (Astronomy), Galactic Radio Waves, Radial Velocity, Red Shift, Relativistic Particles, Spectrum Analysis, Velocity Distribution
Scientific paper
Results are reported for spectroscopic observations of 17 galaxies in Abell 2634 and 16 galaxies in Zwicky 2247+11, both of which clusters contain radio-tail galaxies. The radial-velocity distributions for the observed samples in each cluster are determined; a mean velocity of 9372 km/s with a dispersion in the line-of-sight velocities of 927 km/s and a corresponding total dispersion of 1610 km/s is obtained for the 17 galaxies in Abell 2634, and a mean velocity of 7577 km/s with a corresponding total dispersion of 965 km/s is found for 14 galaxies in Zwicky 2247+11. Calculations performed for the parameters of the radio-tail galaxies in the clusters strongly indicate that significant in situ relativistic-particle acceleration is occurring in the radio tails.
Robertson John W.
Scott Joshua S.
Tarenghi Marco
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