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 was the ADAF (advectiondominated accretion flow) model. Our approach supposes only a simple axisymmetric 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
VITANZA, E., TERESI, V., MOLTENI, D., GERARDI, G. (2006). A simple model of radiative emission in M87. THE ASTROPHYSICAL JOURNAL, 643, 222-225.
A simple model of radiative emission in M87
TERESI, Vincenzo;MOLTENI, Diego;GERARDI, Gaetano
2006-01-01
Abstract
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 was the ADAF (advectiondominated accretion flow) model. Our approach supposes only a simple axisymmetric 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
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