EDP Sciences
Free access
Issue
A&A
Volume 386, Number 2, May I 2002
Page(s) 757 - 762
Section Computational methods
DOI http://dx.doi.org/10.1051/0004-6361:20020234


A&A 386, 757-762 (2002)
DOI: 10.1051/0004-6361:20020234

Comptonization and synchrotron emission in 2D accretion flows

I. A new numerical solver for the Kompaneets equation
A. Hujeirat1, 2, 3, M. Camenzind2 and A. Burkert1

1  Max-Planck-Institut für Astronomie, 69117 Heidelberg, Germany
2  Landessternwarte-Koenigstuhl, 69117 Heidelberg, Germany
3  Institute of Applied Mathematics, University of Heidelberg, 69120 Heidelberg, Germany

(Received 11 October 2001 / Accepted 31 January 2002)

Abstract
A numerical approach is presented for solving the hydro-magnetic radiative transfer equation in 4D, in which the action of the Kompaneets operator and synchrotron cooling are taken into account. The equation is solved using the pre-conditioned Black-White-Brown line Gauss-Seidel semi-iterative method. This alternating approach enables the use of vector and parallel machines without loss of efficiency. The method can be used to constrain and search for density-, temperature- and magnetic-field distributions with or without outflows. This is appropriate for displaying spectra of 2D accretion flows that are consistent with observations of low-mass X-ray binaries.


Key words: methods: numerical -- accretion, accretion disks -- radiative transfer -- black hole physics

Offprint request: A. Hujeirat, A.Hujeirat@lsw.uni-heidelberg.de




© ESO 2002