Compact radio cores and the relation between the radio and optical axes of elliptical galaxies |
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| Authors: | V K Kapahi D J Saikia |
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| Institution: | (1) Radio Astronomy Centre, Tata Institute of Fundamental Research, P O Box 1234, 560012 Bangalore |
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| 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. |
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| Keywords: | radio galaxies elliptical galaxies extended radio sources |
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