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galaxies: individual (b1221–423)

Publications of the Astronomical Society of Australia (1)

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The Extraordinary Radio Galaxy MRC B1221–423
V. Safouris, R. W. Hunstead, O. R. Prouton
Journal:

Publications of the Astronomical Society of Australia / Volume 20 / Issue 1 / 2003

Published online by Cambridge University Press:

05 March 2013, pp. 1-5
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MRC B1221–423 is a compact steep spectrum (CSS) radio source in the core of a remarkable elliptical galaxy. We examine its environment with long-slit spectra and multicolour images. A high-resolution synthesis image shows the radio source to have a 1″.5 (5.7 kpc) double structure. We use the empirical relationship between jet kinetic power and narrow line luminosity to infer a source age of ˜105 yr. The z = 0.1706 host galaxy is clearly disturbed, with tidal features and shells providing plausible evidence for a merger with one or more close companions. This evidence leads us to conclude that B1221–423 may be the progenitor of a much larger source, caught at an early stage in its radio evolution. We speculate that it is the interaction and accompanying events which have triggered this young powerful radio source.