Core radio and optical emission in nearby FR I radio galaxies

Show simple item record Kleijn, Gijs en_US Baum, Stefi en_US de Zeeuw, P. Tim en_US O'Dea, Christopher en_US 2006-05-10T16:58:29Z en_US 2006-05-10T16:58:29Z en_US 2002-03 en_US
dc.identifier.citation Astronomical Journal 123 (2002) 1334-1356 en_US
dc.identifier.issn 1538-3881 en_US
dc.identifier.uri en_US
dc.description Also archived in: arXiv: astro-ph/0112356 v2 18 Dec 2001 en_US
dc.description.abstract In this paper we analyze the relation between radio, optical continuum and Ha +[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 Ha+[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 Ha+[N ii] emission. The tight correlations between radio, optical, and Ha+[N ii] core emission constrain the bulk Lorentz factor to y~ 2–5 and y <~ 2 for a continuous jet and a jet consisting of discrete blobs, respectively, assuming jet-viewing angles in the range 30° –90° . 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 (Refer to PDF file for exact formulas). en_US
dc.description.sponsorship Support for this work was provided by NASA through grant GO-06673.01-95A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. It is a pleasure to thank Michele Cappellari for careful reading of the manuscript and useful suggestions, and the referee for helpful suggestions that improved the manuscript. We thank Aaron Barth for pointing out a significant typo in an earlier version of the paper. en_US
dc.format.extent 570610 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Astronomical Journal en_US
dc.relation RIT Scholars content from RIT Digital Media Library has moved from to RIT Scholar Works, please update your feeds & links!
dc.relation.ispartofseries vol. 123 en_US
dc.relation.ispartofseries no. 3 en_US
dc.relation.ispartofseries pps. 1334-1356 en_US
dc.subject Dust and extinction en_US
dc.subject Galaxies-active en_US
dc.subject Galaxies-elliptical and lenticular en_US
dc.subject Galaxies-nuclei en_US
dc.subject Galaxies-structure en_US
dc.title Core radio and optical emission in nearby FR I radio galaxies en_US
dc.type Article en_US

Files in this item

Files Size Format View
SBaumArticle03-2002.pdf 570.6Kb PDF View/Open

This item appears in the following Collection(s)

Show simple item record

Search RIT DML

Advanced Search