Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940902s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #409.02
Astronomy and Astrophysics
Astronomy
Scientific paper
The Galactic Center hosts a supermassive black hole (BH) with likely a large spin a 0.9. When it accretes at a high rate, the BH should produce strong radiative and mechanical output energizing the surroundings. Currently, only 0.01% of available ejected stellar winds accretes onto the BH likely due to the feedback by conduction. Starved BH is in an underluminous state. I will show how the effective cooling and suppression of conduction may readily lead to 10^4 times larger accretion rate, at which Sgr A* is powerful again. Correspondent periods of jet/accretion disk formation and destruction can be as short 1000 years, but recur multiple times. Such episodes can be responsible for both the light echo in Sgr B and the Fermi bubbles.
Baganoff Fred
McKinney Jonathan
Penna R.
Shcherbakov Roman
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