The Extreme Nuclear Environments of Sgr A^* and Arp 220

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

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 - it's 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 lsun/msun for optically thick regions in which the radiation has been degraded to the NIR.

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