Abstract
The Milky Way centre hosts a supermassive Black Hole (BH) with a mass of \(\sim 4 \times 1{0}^{6}\,\mathrm{M}_{\odot }\). Sgr A∗, its electromagnetic counterpart, currently appears as an extremely weak source with a luminosity L∼10−9LEdd. The lowest known Eddington ratio BH. However, it was not always so; traces of “glorious” active periods can be found in the surrounding medium. We review here our current view of the X-ray emission from the Galactic Center (GC) and its environment, and the expected signatures (e.g. X-ray reflection) of a past flare. We discuss the history of Sgr A∗’s past activity and its impact on the surrounding medium. The structure of the Central Molecular Zone (CMZ), a highly flattened toroid, has not changed significantly since the last active phase of Sgr A∗. This relic torus provides us with the opportunity to image the three-dimensional structure of an AGN torus in exquisite detail.
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- 1.
Even before the Sgr A ∗ case, the (delayed) reflected emission has been discussed (see [46, 266]) for 1E1740.7-2942, one of the two brightest hard X-ray sources in the GC region. During the mid 1990s the source, known to be located inside a molecular cloud [9], was observed in a low state with the flux ∼ 5 times lower than in the bright state. In a set up similar to the one used later for Sgr A ∗ , this fact was used to constrain the optical depth and the size of the cloud from hard X-rays and later from 6.4 keV line [48].
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Acknowledgements
The authors thank the ISSI in Bern. GP thanks S. Bianchi, E. Churazov, G. Matt, S. Gillessen, V. Tatischeff, T. Dwelly, A. Strong, L. Burtscher, A. Merloni, Y. Tanaka and F. Melia for useful discussion. Part of the work was supported by the French Labex “UnivEarthS”.
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Ponti, G., Morris, M.R., Terrier, R., Goldwurm, A. (2013). Traces of Past Activity in the Galactic Centre. In: Torres, D., Reimer, O. (eds) Cosmic Rays in Star-Forming Environments. Astrophysics and Space Science Proceedings, vol 34. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35410-6_26
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