Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1841b&link_type=abstract
American Astronomical Society, HEAD meeting #9, #18.41; Bulletin of the American Astronomical Society, Vol. 38, p.388
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent observations by the HESS array of Cerenkov telescopes have uncovered a point-source emitter of TeV gamma-rays, whose centroid is located within 30" of the supermassive black hole Sgr A*. A likely origin of these TeV photons is pion decay in the particle cascade initiated by a TeV proton accelerated by Sgr A* and a proton in the ambient medium. Liu et al. (2006) have shown that stochastic acceleration of protons close to the central supermassive black hole can account for the observed flux and spectral index of the HESS source. Here, we present results of an exact numerical simulation of proton transport within the central 6 pc^3 of the Galaxy, and the subsequent pion decays and gamma ray emissivity. Utilizing a self-consistent model of the gas density and distribution around Sgr A* (Rockefeller et al. 2005), we predict the location, spectrum and flux of TeV gamma-rays from Sgr A*, with an expectation that this model may be tested with future high-resolution TeV observations.
Ballantyne David R.
Melia Fulvio
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