Compact radio cores and the relation between the radio and optical axes of elliptical galaxies

Kapahi, V. K. ; Saikia, D. J. (1982) Compact radio cores and the relation between the radio and optical axes of elliptical galaxies Journal of Astrophysics and Astronomy, 3 (2). pp. 161-171. ISSN 0250-6335

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Official URL: http://www.ias.ac.in/jarch/jaa/3/161-171.pdf

Related URL: http://dx.doi.org/10.1007/BF02714800

Abstract

We have reinvestigated the reported tendency for the extended radio structures associated with bright elliptical galaxies to be oriented preferentially along the optical minor axes. It is found that such a tendency exists only for those galaxies in which the compact radio cores coincident with their nuclei are quite prominent. If the galaxies are divided into two groups according to whether their cores account for less than or greater than 10 per cent of the total flux density at 2.7 GHz, the angle Φ (between the radio axis and the optical minor axis) appears to be uniformly distributed between 0° and 90° for the former, but is nearly always < 30° for the latter group. One possible explanation is that the radio emission from compact cores suffers thermal absorption by ionized gas that is distributed differently in the two groups.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Radio Galaxies; Elliptical Galaxies; Extended Radio Sources
ID Code:28826
Deposited On:20 Dec 2010 13:45
Last Modified:07 Jun 2011 11:27

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