Why Do Head Tail Sources Exist In Poor Clusters Of Galaxies?

Details Why Do Head Tail Sources Exist In Poor Clusters Of Galaxies? Why Do Head Tail Sources Exist In Poor Clusters Of Galaxies?

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4505b&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #45.05; Bulletin of the American Astronomical Society, Vol. 24, p.1192

Astronomy and Astrophysics

Astronomy

Scientific paper

In a continuing study of radio sources in poor clusters of galaxies, we have obtained VLA observations of four head-tail sources as probes of the intracluster environments: NGC 742, NGC 1044, NGC 4061, and NGC 7503. These sources represent an exceptional opportunity for the study of radio sources (and radio jets in particular). They are very nearby (z ~ 0.02 to 0.04) and thus can be examined in great detail, much like NGC 1265 in Perseus. The four sources contain some remarkable structures. NGC 742 apparently has a companion, NGC 741, in the midst of its extended tail structure. NGC 7503 has a horseshoe shape very similar to NGC 1265. The NGC 4061 source maintains a very linear structure out to equal distances on either side of the galaxy center, where the lobes are sharply `swept back.' These structures are remarkable because the sources are found in poor groups, where both the density of the ICM and the velocities of the galaxies (thus the ram pressures) are supposedly much lower than in the rich clusters. Yet these poor groups have narrow-angle-tail sources (NATs) with the same general characteristics as those in rich clusters. Our calculations indicate that there is not much difference between the poor cluster sources and NGC 1265 in ICM densities, jet luminosity as a fraction of total source luminosity, and radii of curvature of the jets. These are very surprising results. While the jets of two sources (NGC 4061 and NGC 7503) appear to have roughly twice the opening angle of the NGC 1265 jet (which suggests lesser pressure-confinement in poor clusters), most of our evidence points toward remarkably similar environments for rich and poor cluster jets.

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