NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-23 T01:57:33 PDT
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For refcode 2002AJ....123.1334V:
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Copyright by American Astronomical Society. Reproduced by permission
2002AJ....123.1334V CORE RADIO AND OPTICAL EMISSION IN THE NUCLEI OF NEARBY FR I RADIO GALAXIES GIJS A. VERDOES KLEIJN, STEFI A. BAUM, P. TIM DE ZEEUW, AND CHRISTOPHER P. O'DEA Received 2001 September 21; accepted 2001 December 13 ABSTRACT In this paper we analyze the relation between radio, optical continuum and H{alpha}+[N II] emission from the cores of a sample of 21 nearby Fanaroff and Riley type I galaxies as observed with the VLBA and HST. The emission arises inside the inner tens of parsecs of the galaxies. Core radio emission is observed in 19/20 galaxies, optical core continuum emission is detected in 12/21 galaxies and H{alpha}+[N II] core emission is detected in 20/21 galaxies. We confirm the recently detected linear correlation between radio and optical core emission in FR I galaxies and show that both core emissions also correlate with central H{alpha}+[N II] emission. The tight correlations between radio, optical, and H{alpha}+[N II] core emission constrain the bulk Lorentz factor to {gamma} ~ 2-5 and {gamma} <~ 2 for a continuous jet and a jet consisting of discrete blobs, respectively, assuming jet-viewing angles in the range 30^deg^-90^deg^. Radio and optical core emissions are likely to be synchrotron radiation from the inner jet, possibly with a significant contribution from emission by an accretion disk and/or flow. Elliptical galaxies with LINER nuclei without large-scale radio jets seem to follow the core emission correlations found in FR I galaxies. This suggests that the central engines could be very similar for the two classes of active galactic nuclei. Key words: dust, extinction - galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: nuclei - galaxies: structure
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