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Mini-spiral as source of material for Sgr A* in bright state

Published online by Cambridge University Press:  21 February 2013

Bozena Czerny ,
Vladimír Karas ,
Devaky Kunneriath  and
Tapas K. Das
Bozena Czerny
Affiliation:
Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland email: [email protected]
Vladimír Karas
Affiliation:
Astronomical Institute, Academy of Sciences, Boční II 1401, CZ-14131 Prague, Czech Republic email: [email protected], [email protected]
Devaky Kunneriath
Affiliation:
Astronomical Institute, Academy of Sciences, Boční II 1401, CZ-14131 Prague, Czech Republic email: [email protected], [email protected]
Tapas K. Das
Affiliation:
Harish Chandra Research Institute, Allahabad 211019, India email: [email protected]
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Abstract

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The question of the origin of the gas supplying the accretion process is pertinent especially in the context of enhanced activity of Galactic Center during the past few hundred years, seen now as echo from the surrounding molecular clouds, and the currently observed new cloud approaching Sgr A*. We discuss the so-called Galactic Center mini-spiral as a possible source of material feeding the supermassive black hole on a 0.1 parsec scale. The collisions between individual clumps reduce their angular momentum. and set some of the clumps on a plunging trajectory.

We conclude that the amount of material contained in the mini-spiral is sufficient to sustain the luminosity of Sgr A* at the required level. The accretion episodes of relatively dense gas from the mini-spiral passing through a transient ring mode at ~ 104 Rg provide a viable scenario for the bright phase of Galactic Center.

Keywords

Galaxy: centerAccretion, accretion disksBlack hole physics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 199 - 200
Copyright
Copyright © International Astronomical Union 2013

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