Radio nuclei in elliptical galaxies

Details Radio nuclei in elliptical galaxies Radio nuclei in elliptical galaxies

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199...73g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 73-84. Research supported by the Ministero della P

Astronomy and Astrophysics

Astrophysics

124

Elliptical Galaxies, Galactic Nuclei, Radio Galaxies, Red Shift, Statistical Analysis, Very Large Array (Vla), Fourier Transformation, Maximum Likelihood Estimates

Scientific paper

Observations at 4.9 GHz with the VLA are presented for 36 radio galaxies of the B2 and 3C catalogue, with no previous core flux measurement; 24 cores were detected, while for the others stringent upper limits are given. The statistical properties of the radio cores in elliptical galaxies are then analyzed, using a sample of 187 radio galaxies, which cover a power range from 1023 to 1028W Hz-1. Correlations are found between the core power and the total power and between the core power and the optical absolute magnitude, in agreement with previous results; no redshift dependence is found of the two correlations. The existence of radio galaxies with upper limits to the core flux well below the value expected from the Pc-Pt correlation suggests that these could be relic radio sources, where the nucleus has ceased its activity.

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