Mathematics – Logic
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1319c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, May 1989, p. 1319-1336.
Mathematics
Logic
25
Elliptical Galaxies, Optical Properties, Radio Emission, Radio Galaxies, Brightness Distribution, Galactic Evolution, Luminosity, Red Shift
Scientific paper
To study the origin of radio activity in early-type galaxies, the possible dependence of their radio emission on basic optical parameters, such as the absolute magnitude, the central velocity dispersion sigma, and the mean surface brightness mu is explored. A sample of 743 E and SO galaxies is used which is based on three independent radio surveys of optically selected galaxies with virtually complete information on magnitudes, morphological types, redshift distances, diameters, and radio fluxes. For both E and SO galaxies, only the absolute magnitude appears to be directly related to the radio activity, while sigma and mu do not. Also, a significant dependence of the apparent flattening on radio power is confirmed for E galaxies. Some relevant implications of these results are discussed.
Calvani Massimo
Fasano Giovanni
Franceschini Alberto
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