Astronomy and Astrophysics – Astronomy
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..478h&link_type=abstract
Astronomical Journal, vol. 83, May 1978, p. 478-481.
Astronomy and Astrophysics
Astronomy
23
Galactic Clusters, Radio Galaxies, Red Shift, Astronomical Catalogs, Radial Velocity, X Ray Sources
Scientific paper
Spectroscopic observations are reported for galaxies in A347, A779, and Zw 1809+50. These clusters contain at least six radio sources, two of which are well observed radio-tail sources. For A347, the mean cluster redshift implies physical association with A426, in accord with Zwicky's (1968) suggestion that both clusters are members of a single large group. The observed cluster velocity dispersion of A347 and the peculiar radial velocity of 3C66 suggest that this galaxy's radio source may be an intermediate angle tail rather than a projected narrow angle tail. The data for Zw 1809+50 and its radio-tail galaxy demonstrate that in situ particle acceleration plays a major role in determining the radio tail's length. Finally, the clusters' observed velocity dispersions and a velocity dispersion-X-ray luminosity relation are used to estimate X-ray fluxes from the clusters. These fluxes are in keeping with nondetection of the clusters by the Ariel V survey.
Hintzen Paul
Oegerle William R.
Scott Joshua S.
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