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

Дата и время публикации : 2012-11-06T14:11:56Z

Авторы публикации и институты :
Bozena Czerny
Vladimir Karas
Devaky Kunneriath
Tapas K. Das

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: To appear inPproceedings of IAUS 290 “Feeding Compact Objects: Accretion on All Scales”, C. M. Zhang, T. Belloni, M. Mendez & S. N. Zhang (eds.)
Первичная категория: astro-ph.GA

Все категории : astro-ph.GA

Краткий обзор статьи: 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 $sim 10^4$ Rg provide a viable scenario for the bright phase of Galactic Center.

Category: Physics