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What Bends Wide-Angle Tailed Radio Sources?

Published online by Cambridge University Press:  14 August 2015

Jack O. Burns
Affiliation:
University of New Mexico, Albuquerque, NM, USA
Jean A. Eilek
Affiliation:
New Mexico Tech, Socorro, NM, USA
Frazer N. Owen
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, USA

Extract

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It has been generally assumed that wide-angle tailed (WAT) sources like 3C465 are formed in a manner similar to that of the more strongly bent U-shaped sources such as NGC 1265, i.e., by ram pressure arising from galaxy motion through a dense intracluster medium (ICM). The WAT sources were thought to be less strongly bent because of the smaller ratio of tail plasma flow momentum flux to galaxy velocity. However, as noted recently by Burns (1981), there is a serious discrepancy between the ram pressure model requirements for bending WATs and the dynamics of the associated radio galaxy. To bend the tails, we calculate that the galaxy must typically move at velocities of 0.7–1×103 km s−1 for distances comparable to the length of the radio tails (∼200 kpc for 3C465). This implied galaxy motion is inconsistent with the nature of the massive cD galaxies generally associated with WATs. Cluster galaxy velocity data, X-ray observations, and recent models suggest that these giant galaxies are nearly at rest at the bottoms of cluster potential wells, at most moving ∼200 km s−1 in an oscillatory motion of small amplitude (<0.3 of a core radius, Malumuth, 1981, private communication). Thus it appears that some other mechanism is responsible for bending WAT sources.

Type
Research Article
Copyright
Copyright © Reidel 1982 

References

Burns, J. O. 1981, M.N.R.A.S. , 195, 523.CrossRefGoogle Scholar
De Young, D. S., Condon, J. J., and Butcher, H. 1980, Ap.J. , 242, 511.Google Scholar
Eilek, J. A., Owen, F. N., Burns, J. O., and O'Dea, C. 1981, in preparation.Google Scholar