Spherical Accretion in Nearby Weakly Active Galaxies

Abstract

We consider the sample of weakly active galaxies situated in 'Local Universe' collected in the paper of Pellegrini (2005) with inferred accretion efficiencies from $10^{-2}$ to $10^{-7}$. We apply a model of spherically symmetrical Bondi accretion for given parameters ($M_{BH}$,$T_{\infty }$,${\rho }_{\infty }$,) taken from observation. We calculate spectra emitted by the gas accreting onto its central objects using Monte Carlo method including synchrotron and bremsstrahlung photons as seed photons. We compare our results with observed nuclear X-ray luminosities $L_{X,nuc}$ (0.3-10 keV) of the sample. Model is also tested for different external medium parameters (${\rho }_{\infty }$ and $T_{\infty }$) and different free parameters of the model. Our model is able to explain most of the observed nuclear luminosities $L_X$ under an assumption that half of the compresion energy is transfered directly to the electrons.

arXiv comment19 pages, 11 figures, accepted to A&A

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• Accretion of Low Angular Momentum Material onto Black Holes: Radiation Properties of Axisymmetric MHD Flows
• Multi-phase environment of compact galactic nuclei: the role of the Nuclear Star Cluster
• What is the real accretion rate onto a black hole for low angular momentum accretion?
• Influence of flow thickness on general relativistic low angular momentum accretion around spinning black holes
• Effect of matter geometry on low angular momentum black hole accretion in the Kerr metric
• Low angular momentum flow model of Sgr A* activity
• Low angular momentum accretion flow model of Sgr A* activity