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Paper: The Extreme Nuclear Environments of Sgr A* and Arp 220
Volume: 408, The Starburst−AGN Connection
Page: 95
Authors: Scoville, N.Z.
Abstract: The dense ISM which is the fuel for both nuclear starbursts is believed to be accreted to the nucleus by stellar bars and galactic interactions. In this contribution, I summarize the observational results for two galactic nuclei at the extreme ends of starburst/AGN activity − our own Galactic nucleus with SgrA* and the ULIRG Arp 220. I discuss theoretical considerations for the properties of the ISM − its density and scale height, whether it is likely to clump into gravitational bound GMCs − and the self-regulation of SB and AGN fueling due to radiation pressure support of the ISM. The latter yields an Eddington-like limit on the activity for both SB and AGN, corresponding to approximately 500 Lʘ /Mʘ for optically thick regions in which the radiation has been degraded to the NIR.
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