Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21930801p&link_type=abstract
American Astronomical Society, AAS Meeting #219, #308.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We study radiation-regulated gas accretion onto intermediate-mass black holes emphasizing the role of thermal and radiation pressure in limiting gas supply from large scales to the black hole. Assuming quasi-spherical symmetry, we explore how the gas accretion depends on free parameters such as radiative efficiency, black hole mass, ambient gas density/temperature, and the spectral index of the radiation. Our numerical simulations show an oscillatory behavior of the accretion rate, and thus the luminosity from the black hole. We present a model for the feedback loop and provide analytical relationships for the average/maximum accretion rate and the period of the accretion bursts. The thermal structure inside the Stromgren sphere is a key factor for the regulation process. With increasing ambient gas density and mass of black holes, eventually the accretion rate becomes limited by radiation pressure. The period of the luminosity bursts is proportional to the average size of the ionized hot bubble. But there are two distinct modes of oscillations with very different duty cycles, and that are governed by different depletion processes of the gas inside the ionized bubble.We also study how angular momentum of the gas and the motion of the black hole relative to the ambient gas affect the accretion process.
Park KwangHo
Ricotti Massimo
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