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Can we infer the past activity of M31⋆ as we do for Sgr A⋆?

Published online by Cambridge University Press:  09 February 2017

Maïca Clavel ,
Régis Terrier ,
Andrea Goldwurm ,
Mark R. Morris  and
Gabriele Ponti
Maïca Clavel
Affiliation:
Space Science Laboratory, University of California, Berkeley, CA 94720-7450, USA email: [email protected]
Régis Terrier
Affiliation:
APC, Univ. Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs. de Paris, USPC, France
Andrea Goldwurm
Affiliation:
APC, Univ. Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs. de Paris, USPC, France Service d’Astrophysique, IRFU, CEA Saclay, 91191 Gif-sur-Yvette, France
Mark R. Morris
Affiliation:
Dept. of Physics & Astronomy, University of California, Los Angeles, CA 90095-1547, USA
Gabriele Ponti
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, 85741 Garching, Germany
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Abstract

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The history of supermassive black holes’ activity can be partly constrained by monitoring the diffuse X-ray emission possibly created by the echoes of past events propagating through the molecular clouds of their respective environments. In particular, using this method we have demonstrated that our Galaxy’s supermassive black hole, Sgr A⋆, has experienced multiple periods of higher activity in the last centuries, likely due to several short but very energetic events, and we now investigate the possibility of studying the past activity of other supermassive black holes by applying the same method to M31⋆. We set strong constraints on putative phase transitions of this more distant galactic nucleus but the existence of short events such as the ones observed in the Galactic center cannot be assessed with the upper limits we derived.

Keywords

Galaxy: centergalaxies: individual (M31)X-rays: ISMreflection nebulaeradiation mechanisms: nonthermal
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 253 - 256
Copyright
Copyright © International Astronomical Union 2017 

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