6533b7d8fe1ef96bd126ad4e

RESEARCH PRODUCT

A model of M87 nuclear emission without ADAF

Enrico VitanzaDiego MolteniGaetano GerardiV. Teresi

subject

PhysicsAngular momentumActive galactic nucleusAstrophysics::High Energy Astrophysical PhenomenaBremsstrahlungAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsGalactic nucleiGalaxyAccretion (astrophysics)Radiative efficiencyAstrophysics::Solar and Stellar AstrophysicsAdiabatic processAstrophysics::Galaxy Astrophysics

description

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.

yearjournalcountryeditionlanguage
2007-01-01
http://hdl.handle.net/10447/2117