The AGN/Starburst connection in luminous infrared galaxies |
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| Authors: | LJ Kewley CA Heisler MA Dopita RP Norris |
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| Institution: | (1) Research School of Astronomy and Astrophysics Mount Stromlo and Siding Spring Observatory, Private Bag, Weston Creek PO, ACT, 2611, Australia;(2) Australia Telescope National Facility, PO Box 76, Epping, NSW, 1710, Australia |
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| Abstract: | We are addressing the issue of whether there exists an evolutionaryconnection between starburst and AGN in luminous infrared galaxies. We are combining theoretical modelling with optical, radio and infrared data from IRAS for a large sample of 285 infrared galaxies with a range ofluminosities. In this paper, we present a comparison between the optical spectroscopic data with the incidence of compact radio cores for a subsample of these galaxies. We find 90% of AGN type galaxies contain compact radio cores, while 37% of starburst galaxies contain compact radio cores. The compact radio cores in the starburst galaxies have a minimum brightness temperature of 3 × 105 K, higher than those of standard extended HII regions and may be obscured AGN or complexes of extremely luminous supernovae such as that seen in Arp 220. |
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