A simple model of radiative emission in M87

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 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.

arXiv comment11 pages, 6 figures, accepted for publication in The Astrophysical Journal

References in corpus (9)

• Accretion onto the Supermassive Black Hole in M87
• A High Resolution X-ray Image of the Jet in M 87
• The `quiescent' black hole in M87
• Chandra X-ray Imaging and Spectroscopy of the M87 Jet and Nucleus
• The ACS Virgo Cluster Survey III. Chandra and HST Observations of Low-Mass X-Ray Binaries and Globular Clusters in M87
• Advection-dominated accretion: global transonic solutions
• The Dynamics of the M87 Globular Cluster System
• On the Azimuthal Stability of Shock Waves around Black Holes
• X-ray Images of Hot Accretion Flows