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Multiple accretion events as a trigger for Sagittarius A* activity

Published online by Cambridge University Press:  22 May 2014

D. Kunneriath ,
B. Czerny ,
V. Karas  and
T. K. Das
D. Kunneriath
Affiliation:
Astronomical Institute, AS CR, Prague, Czech Republic email: [email protected]
B. Czerny
Affiliation:
Nicolaus Copernicus Astronomical Centre, Warsaw, Poland
V. Karas
Affiliation:
Astronomical Institute, AS CR, Prague, Czech Republic email: [email protected]
T. K. Das
Affiliation:
Harish Chandra Research Institute, Allahabad, India
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Abstract

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The Galactic center supermassive black hole is surrounded by orbiting clouds of gas. These clumps of gas may collide with each other, losing angular momentum and plunging towards the center. Observations of X-ray reflection from molecular clouds surrounding the Galactic center show evidence for enhanced activity of Sagittarius A* during the past few hundred years. These observations enable us to place constraints on the nature of past accretion events responsible for this enhanced activity. We model the source intrinsic luminosity of Sgr A* using multiple accretion events occurring at various moments in time, characterized by a range of angular momentum We also applied our scheme to the case of G2 cloud in the Galactic center.

Keywords

accretion — accretion disks — Galaxy: center
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 320 - 321
Copyright
Copyright © International Astronomical Union 2014 

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