Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...586..389b&link_type=abstract
The Astrophysical Journal, Volume 586, Issue 1, pp. 389-402.
Astronomy and Astrophysics
Astronomy
11
Accretion, Accretion Disks, Radiation Mechanisms: Nonthermal, Radiation Mechanisms: Thermal, Radiative Transfer, X-Rays: Binaries
Scientific paper
We present and discuss first results of space- and time-dependent Monte Carlo/Fokker-Planck radiation transport/electron dynamics simulations of flares in accretion disk corona systems in two-dimensional, cylindrical geometry. Following a brief, general description of the code, two fundamentally different flaring mechanisms will be considered: (1) flares originating in the optically thick, geometrically thin accretion disk, whose radiation is subsequently processed through a hot, optically thin corona sandwiching the accretion disk; and (2) flares originating in the corona (e.g., magnetic flares), leading to enhanced energy release in a small portion of the corona over a short period of time. We present energy- and angle-dependent light curves, angle- and time-dependent photon spectra, and time and phase lag spectra for both classes of flaring scenarios. We also illustrate the detailed, time-dependent effect of both types of flares on the electron temperature distribution in the corona, which is calculated self-consistently, including both thermal and nonthermal heating and cooling mechanisms. Whereas for the disk-flaring scenario, the flaring is mostly restricted to X-rays below ~10 keV, accompanied by spectral softening during the flare, the coronal flaring scenario produces predominantly hard X-ray flares (restricted to E>~10 keV) with spectral hardening during the flare. Both hard and soft lags may result in the disk-flaring scenario, which predicts a slight hardening of the high-frequency power spectra with increasing photon energy. In the coronal-flaring scenario, the variability around ~10 keV leads variations at other photon energies, and no dependence of the power spectra on photon energy is found.
Böttcher Markus
Jackson Douglas R.
Liang Edison P.
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