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26 April 2024 |
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Article overview
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Traces of past activity in the Galactic Centre | | Gabriele Ponti
; Mark R. Morris
; Regis Terrier
; Andrea Goldwurm
; | | Date: |
10 Oct 2012 | | Abstract: | The Milky Way centre hosts a supermassive Black Hole (BH) with a mass of
~4*10^6 M_Sun. Sgr A*, its electromagnetic counterpart, currently appears as an
extremely weak source with a luminosity L~10^-9 L_Edd. 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) has not changed significantly
since the last active phase of Sgr A*. This relic torus provides us with the
opportunity to image the structure of an AGN torus in exquisite detail. | | Source: | arXiv, 1210.3034 | | Services: | Forum | Review | PDF | Favorites | |
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