Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-22
Astrophys.J.643:222-225,2006
Astronomy and Astrophysics
Astrophysics
11 pages, 6 figures, accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/502711
We present a simple physical model of the central source emission in the M87 galaxy. It is well known that the observed X-ray luminosity from this galactic nucleus is much lower than the predicted one, if a standard radiative efficiency is assumed. Up to now the main model invoked to explain such a luminosity is the ADAF (Advection-Dominated-Accretion-Flow) model. Our approach supposes only a simple axis-symmetric adiabatic accretion with a low angular momentum together with the bremsstrahlung emission process in the accreting gas. With no other special hypothesis on the dynamics of the system, this model agrees well enough with the luminosity value measured by Chandra.
Gerardi G.
Molteni Diego
Teresi Vincenzo
Vitanza Enrico
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