X-ray emissions from two-temperature accretion flows within a dipole magnetic funnel
arXiv:0705.1331 · doi:10.1111/j.1365-2966.2007.11958.x
Abstract
We investigate the hydrodynamics of accretion channelled by a dipolar magnetic field (funnel flows). We consider situations in which the electrons and ions in the flow cannot maintain thermal equilibrium (two-temperature effects) due to strong radiative loss, and determine the effects on the keV X-ray properties of the systems. We apply this model to investigate the accretion shocks of white dwarfs in magnetic cataclysmic variables. We have found that the incorporation of two-temperature effects could harden the keV X-rays. Also, the dipolar model yields harder X-ray spectra than the standard planar model if white dwarf is sufficiently massive (>~1M_sun). When fitting observed keV X-ray spectra of magnetic cataclysmic variables, the inclusion of two-temperature hydrodynamics and a dipolar accretion geometry lowers estimates for white-dwarf masses when compared with masses inferred from models excluding these effects. We find mass reductions <~9% in the most massive cases.
MNRAS accepted; 13 pages, 10 figures, 2 tables
References in corpus (6)
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- Kinetic description of quasi-stationary axisymmetric collisionless accretion disk plasmas with arbitrary magnetic field configurations
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- Influence of Compton scattering on the broad-band X-ray spectra of intermediate polars
- Application of a new X-ray reflection model to V1223 Sagittarii
- Stokes imaging of AM Her systems using 3D inhomogeneous models-II. Modelling X-ray and optical data of CP Tucanae
- Breaking the degeneracy in magnetic cataclysmic variable X-ray spectral modeling using X-ray light curves
- Broad Observational Perspectives Achieved by the Accreting White Dwarf Sciences in the XMM-Newton and Chandra Eras