Hardening of thermal photons through inverse compton scattering in strong magnetic fields

Authors
Citation
Y. Xu et Hh. Xu, Hardening of thermal photons through inverse compton scattering in strong magnetic fields, CHIN J ASTR, 1(5), 2001, pp. 411-420
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
ISSN journal
1009-9271 → ACNP
Volume
1
Issue
5
Year of publication
2001
Pages
411 - 420
Database
ISI
SICI code
1009-9271(200110)1:5<411:HOTPTI>2.0.ZU;2-Q
Abstract
A new spectrum function is obtained by use of the Compton scattering cross section in the laboratory frame derived earlier. This spectrum function, be sides some modifications in the coefficients of the resonant term, contains also a non-resonant terra which is inversely proportional to the square of the magnetic field. Based on this spectrum function, the hardening of ther mal photons through inverse Compton scattering by relativistic electron bea ms on the surface of a strongly magnetized neutron star is investigated. Tw o new features are found. First, there is a maximum scattered photon energy for a given resonant scattering, beyond which resonance disappears. This m aximum depends on the electron energy and the magnetic field, but is indepe ndent of the incident photon energy. Second, beyond each resonant scatterin g, there is a high-energy tail, resulting from non-resonant scattering. It is also found that all the tails have a common upper limit which is the hig hest scattered photon energy for the given incident photon and electron ene rgies. These two new features are absent in the Monte Carlo simulations and therefore, may have physical implications for gamma -ray emissions.