Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..575c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, April 1, 1986, p. 575-588.
Astronomy and Astrophysics
Astronomy
32
Astronomical Spectroscopy, Elliptical Galaxies, Emission Spectra, Galactic Structure, Radio Sources (Astronomy), Astronomical Maps, Galactic Clusters, Galactic Evolution, Luminosity, Tables (Data)
Scientific paper
An optically selected sample of 67 giant E and S0 galaxies has been observed with radio telescopes of high sensitivity to low-brightness emission. Correlations between radio emission and galaxy type and between radio emission and environment are confirmed, and the fraction of E galaxies with M(B) less than -21.75 that have radio powers P greater than 10 to the 23rd W/Hz at 2380 MHz is found to be 0.4 + or - 0.1. For all of the 19 sources with P greater than 10 to the 23rd W/Hz there is evidence on high-resolution maps of continuing central activity. Sensitive observations at 151 MHz are used to put limits on the number of steep-spectrum radio sources, which may be relics of past activity in other sample galaxies, more effectively than has previously been possible. Based on the expected lifetime at 151 MHz of radiatively decaying sources, the time-scale over which typical radio galaxies remain active is determined to be greater than a few billion yr. This is in conflict with the small linear sizes of many radio sources in this sample, and it is likely that other effects (such as expansion losses in unconfined sources) render the older parts of these objects invisible.
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