Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-09
Astrophys.J.617:L123-L126,2004
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures; accepted for publication in ApJ Letters, minor revisons
Scientific paper
10.1086/427390
The HESS collaboration recently reported highly significant detection of TeV gamma-rays coincident with Sgr A*. In the context of other Galactic Center (GC) observations, this points to the following scenario: In the extreme advection-dominated accretion flow (ADAF) regime of the GC black hole (BH), synchrotron radio/sub-mm emission of 100 MeV electrons emanates from an inefficiently radiating turbulent magnetized corona within 20 Schwarzschild radii of the GCBH. These electrons are accelerated through second-order Fermi processes by MHD turbulence. Closer to the innermost stable orbit of the ADAF, instabilities and shocks within the flow inject power-law electrons through first-order Fermi acceleration to make synchrotron X-ray flares observed with Chandra, XMM, and INTEGRAL. A subrelativistic MHD wind subtending a 1sr cone with power > 10^{37} erg/s is driven by the ADAF from the vicinity of the GCBH. As in pulsar powered plerions, electrons are accelerated at the wind termination shock, at > 10^{16.5} cm from the GCBH, and Compton-scatter the ADAF and the far infra-red (FIR) dust radiation to TeV energies. The synchrotron radiation of these electrons forms the quiescent X-ray source resolved by Chandra. The radio counterpart of this TeV/X-ray plerion, formed when the injected electrons cool on timescales 10^4 yrs, could explain the origin of nonthermal radio emission in the pc-scale bar of the radio nebula Sgr A West.
Atoyan Armen
Dermer Carles D.
No associations
LandOfFree
TeV Emission from the Galactic Center Black-Hole Plerion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with TeV Emission from the Galactic Center Black-Hole Plerion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and TeV Emission from the Galactic Center Black-Hole Plerion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-217496