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Date and Time of the Query: 2019-05-24 T09:49:08 PDT
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For refcode 1988A&A...199...73G:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...199...73G Radio nuclei in elliptical galaxies G. Giovannini, L. Feretti, L. Gregorini, and P. Parma Istituto di Radioastronomia, Via Irnerio 46, I-40126 Bologna, Italy Dipartimento di Astronomia dell'Universita, Casella Postale 596, I-40100 Bologna, Italy Received October 14, accepted December 22, 1987 Summary. 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 10^23^ to 10^28^ W 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 P_c_-P_t_ correlation suggests that these could be relic radio sources, where the nucleus has ceased its activity. Key words: galaxies: radio - galaxies: nuclei of- VLA maps
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