Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 189, Issue 2, Pages 286-308Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/189/2/286
Keywords
accretion, accretion disks; cosmic background radiation; galaxies: jets; methods: analytical; radiation mechanisms: non-thermal; scattering
Categories
Funding
- CIMO [TM-06-4630]
- Academy of Finland [122055, 127512]
- Academy of Finland (AKA) [122055, 122055] Funding Source: Academy of Finland (AKA)
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Compton scattering plays an important role in various astrophysical objects such as accreting black holes and neutron stars, pulsars, relativistic jets, and clusters of galaxies, as well as the early universe. In most of the calculations, it is assumed that the electrons have isotropic angular distribution in some frame. However, there are situations where the anisotropy may be significant due to the bulk motions, or where there is anisotropic cooling by synchrotron radiation or an anisotropic source of seed soft photons. Here we develop an analytical theory of Compton scattering by anisotropic distribution of electrons that can significantly simplify the calculations. Assuming that the electron angular distribution can be represented by a second-order polynomial over the cosine of some angle (dipole and quadrupole anisotropies), we integrate the exact Klein-Nishina cross section over the angles. Exact analytical and approximate formulae valid for any photon and electron energies are derived for the redistribution functions describing Compton scattering of photons with arbitrary angular distribution by anisotropic electrons. The analytical expressions for the corresponding photon scattering cross section on such electrons, as well as the mean energy of scattered photons, its dispersion, and radiation pressure force are also derived. We apply the developed formalism to the accurate calculations of the thermal and kinematic Sunyaev-Zeldovich effects for arbitrary electron distributions.
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