EDP Sciences
Free access
Volume 499, Number 3, June I 2009
Page(s) 643 - 648
Section Astrophysical processes
DOI http://dx.doi.org/10.1051/0004-6361/200811596
Published online 08 April 2009
A&A 499, 643-648 (2009)
DOI: 10.1051/0004-6361/200811596

Research Note

Approximation of the radiation power of electrons due to the inverse-Compton process in the black-body photon field

O. Petruk

Institute for Applied Problems in Mechanics and Mathematics, Naukova St. 3-b, Lviv 79060, Ukraine
    e-mail: petruk@astro.franko.lviv.ua

Received 25 December 2008 / Accepted 25 February 2009

Aims. An approximation is presented for the inverse-Compton radiation power of electrons in the isotropic black-body photon field.
Methods. This approximation allows calculation of the inverse-Compton emissivity as an integral over the energies of incident electrons rather than over the field photon energies. Such an approach allows for accurate modeling of IC emission of electrons with energy spectra different from power law, in tasks where essential CPU resources are needed.
Results. The high accuracy of this approximation allows it to be used in a wide range of conditions, from Thomson to extreme Klein-Nishina limits, in different astrophysical objects. This approach also results in some new analytic expressions representing the known results in the Thomson limit.

Key words: radiation mechanisms: non-thermal -- gamma rays: theory

© ESO 2009