Statistics – Computation
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.2002w&link_type=abstract
American Astronomical Society, HEAD meeting #12, #20.02
Statistics
Computation
Scientific paper
For inner magnetospheric models of hard X-ray and gamma-ray emission in high-field pulsars and magnetars, resonant Compton upscattering is anticipated to be the most efficient process for generating continuum radiation. For magnetars, this is due in part to the proximity of a hot soft photon bath from the stellar surface. Moreover, because the scattering process becomes resonant at the cyclotron frequency, the effective cross section exceeds the classical Thomson value by over two orders of magnitude, thereby enhancing the efficiency of continuum production and the cooling of relativistic electrons. This paper presents computations of the electron cooling rates for this process,
extending previous calculations of magnetic Thomson cooling to the domain of relativistic quantum effects, sampled near and above the quantum critical magnetic field of 44.13 TeraGauss. Angle-dependent hard X-ray spectra, incorporating self-consistent electon cooling via kinetic equation and Monte Carlo analyses, are also presented; these assume a radiation-reaction limited acceleration scenario for relativistic electrons in a magnetar magnetosphere. Our research addresses fully relativistic, quantum magnetic Compton cooling and emission by electrons, employing a new Sokolov and Ternov (ST) formulation of Compton scattering in strong magnetic fields. Such ST formalism is formally correct for treating spin-dependent effects that are important in the cyclotron resonance, and has not been addressed before in the context of Compton upscattering models of magnetar hard X-ray tail emission.
Baring Matthew G.
Gonthier Peter L.
Harding Alice K.
Wadiasingh Zorawar
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