Radiation Spectra from Advection‐dominated Accretion Flows in a Global Magnetic Field

2000/02/01 by Motoki Kino, Osamu Kaburaki, Naohiro Yamazaki · 14 citations
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Intermediate polar #Magnetic field #Radiation #Radiation pressure #Spectral line #Turbulence #astro-ph

paper · pdf · doi:10.1086/308962

published in The Astrophysical Journal 536(2), 788-797 (IOP Publishing) · Accepted for publication in ApJ

arxiv created 2000/02/01 · openalex publication_date 2000/06/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We calculate the radiation spectra from advection-dominated accretion flows (ADAFs), taking into account the effects of a global magnetic field. Our calculation is based on the analytic model for magnetized ADAFs proposed by Kaburaki, in which a large-scale magnetic field controls the accretion process. Adjusting a few parameters, we find that our model can well reproduce the observed spectrum of Sagittarius A*. The result is discussed in comparison with those of well-known ADAF models, in which the turbulent viscosity controls the accretion process.

Citations

• Advection-dominated Accretion: Underfed Black Holes and Neutron Stars
• Analytic Model for Advection‐dominated Accretion Flows in a Global Magnetic Field
• Intrinsic Size of Sagittarius A*: 72 Schwarzschild Radii
• On the fate of gas accreting at a low rate on to a black hole
• Harmony in Electrons: Cyclotron and Synchrotron Emission by Thermal Electrons in a Magnetic Field