期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 431, 期 3, 页码 2872-2884出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt388
关键词
accretion, accretion discs; black hole physics; MHD; radiation mechanisms: thermal; methods: numerical; Galaxy: centre
资金
- Netherlands Organisation for Scientific Research (NWO) Vidi Fellowship
- European Communities [ITN 215212]
- National Science Foundation [AST 0807385, PHY11-25915]
- Oak Ridge Associated Universities/Oak Ridge National Laboratory
We present the first spectral energy distributions produced self-consistently by 2.5D general relativistic magnetohydrodynamical (GRMHD) numerical simulations, where radiative cooling is included in the dynamical calculation. As a case study, we focus on the accretion flow around the supermassive black hole in the Galactic Centre, Sagittarius A* (Sgr A*), which has the best constrained physical parameters. We compare the simulated spectra to the observational data of Sgr A* and explore the parameter space of our model to determine the effect of changing the initial magnetic field configuration, the ion-to-electron temperature ratio T-i/T-e and the target accretion rate. We find the best description of the data for a mass accretion rate of similar to 10(-9) M-circle dot yr(-1), and rapid spin (0.7 < a(*) < 0.9). The submillimetre peak flux seems largely independent of initial conditions, while the higher energies can be very sensitive to the initial magnetic field configuration. Finally, we also discuss flaring features observed in some simulations, which may be due to artefacts of the 2D configuration.
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