grmonty: a Monte Carlo Code for Relativistic Radiative Transport

Details grmonty: a Monte Carlo Code for Relativistic Radiative Transport grmonty: a Monte Carlo Code for Relativistic Radiative Transport

2009-09-03

arxiv.org/abs/0909.0708v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

38 pages, 17 figures, accepted to ApJS

Scientific paper

We describe a Monte Carlo radiative transport code intended for calculating spectra of hot, optically thin plasmas in full general relativity. The version we describe here is designed to model hot accretion flows in the Kerr metric and therefore incorporates synchrotron emission and absorption, and Compton scattering. The code can be readily generalized, however, to account for other radiative processes and an arbitrary spacetime. We describe a suite of test problems, and demonstrate the expected $N^{-1/2}$ convergence rate, where $N$ is the number of Monte Carlo samples. Finally we illustrate the capabilities of the code with a model calculation, a spectrum of the slowly accreting black hole Sgr A* based on data provided by a numerical general relativistic MHD model of the accreting plasma.

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