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Examining the Seyfert-Starburst Connection with Arcsecond-Resolution Radio Continuum Observations

Laine, Seppo and Kotilainen, Jari K. and Reunanen, Juha and Ryder, Stuart D. and Beck, Rainer (2006) Examining the Seyfert-Starburst Connection with Arcsecond-Resolution Radio Continuum Observations. Astronomical Journal, 131 (2). pp. 701-715. ISSN 1538-3881. doi:10.1086/499037.

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We compare the arcsecond-scale circumnuclear radio continuum properties of five Seyfert and five starburst galaxies, concentrating on the search for any structures that could imply a spatial or causal connection between the nuclear activity and a circumnuclear starburst ring. No evidence is found in the radio emission for a link between the triggering or feeding of nuclear activity and the properties of circumnuclear star formation. Conversely, there is no clear evidence of nuclear outflows or jets triggering activity in the circumnuclear rings of star formation. Interestingly, the difference in the angle between the apparent orientation of the most elongated radio emission and the orientation of the major axis of the galaxy is on average larger in Seyfert galaxies than in starburst galaxies, and Seyfert galaxies appear to have a larger physical size scale of the circumnuclear radio continuum emission. The concentration, asymmetry, and clumpiness parameters of radio continuum emission in Seyfert galaxies and starbursts are comparable, as are the radial profiles of radio continuum and near-infrared line emission. The circumnuclear star formation and supernova rates do not depend on the level of nuclear activity. The radio emission usually traces the near-infrared Brγ and H_2 1-0 S(1) line emission on large spatial scales, but locally their distributions are different, most likely because of the effects of varying local magnetic fields and dust absorption and scattering.

Item Type:Article
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URLURL TypeDescription Paper
Laine, Seppo0000-0003-1250-8314
Ryder, Stuart D.0000-0003-4501-8100
Additional Information:© 2006. The American Astronomical Society. Received 2004 November 1; accepted 2005 October 14. We thank Torsten Böker, Richard Davies, and Paul van der Werf for providing us with NIR line images. We are also thankful to Ray Norris for comments on an earlier draft of this paper, to Mark Lacy for discussions on the radio jet–AGN luminosity correlation, and to Tom Pannuti for discussions on the radio continuum emission from supernova remnants. We are thankful to the referee, W. C. Keel, for suggestions that improved the quality of the paper. J. K. K. was supported by the Academy of Finland (project 8201017) during part of this work. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Academy of Finland8201017
Subject Keywords:galaxies: active; galaxies: nuclei; galaxies: Seyfert; galaxies: starburst; radio continuum: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20170408-164811174
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Official Citation:Seppo Laine et al 2006 AJ 131 701
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76254
Deposited By: 1Science Import
Deposited On:09 Mar 2018 18:48
Last Modified:15 Nov 2021 16:58

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