Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52....1l&link_type=abstract
Acta Astronomica Sinica, vol. 52, no. 1, p. 1-15
Astronomy and Astrophysics
Astrophysics
1
Radiation Mechanisms: Non-Thermal, Methods: Analytical, Gamma Rays: General
Scientific paper
The resonant inverse Compton scattering (RICS) of relativistic electrons in an intense magnetic field of a neutron star is an efficient mechanism for producing the high-energy γ-rays due to its high efficiency, high frequency, highly beaming behaviour and comparatively good monochromaticity, concentrating most radiation in the high-frequency band (hard X-ray and γ-ray). In our previous work, it is argued that the dominant radiation mechanism responsible for the prompt γ-ray emission of gamma-ray bursts (GRBs) in the early stage could be the RICS of relativistic electrons. By using this mechanism, some puzzles in the study of GRBs could be clarified, e.g., the origin of the Amati relation, the formation of the observed broken power-law spectra, the related deadline problem, the polarization property, etc. The simplified analytical formulae of collective RICS spectra of the assembly of relativistic electrons in an intense magnetic field are derived in this paper, based on the simple RICS power spectra of a single fast electron given in our previous work. By using these formulae, a series of collective RICS spectra for various typical ambient low-frequency radiation fields around the central neutron star, e.g., the black body radiation, the nonthermal field with a power-law spectrum and the thermal bremsstrahlung field, are calculated. The collective RICS spectra are all in quite simple analytical expressions, which are convenient for comparison with the observed spectra. Our calculations show that the RICS process is really a very efficient radiation mechanism in the hard X-ray and γ-ray bands if the "accommodation condition" (or the "matching condition") is satisfied. Our calculations show that despite what kind of ambient soft-photon field is related, various collective RICS spectra have common broken power-law forms with different indexes in the low- and high-frequency bands respectively. Finally, we discuss the potential applications of RICS mechanism in high-energy astrophysics, i.e., in the explorations of the origins of radiation from GRBs, soft gamma-ray repeaters (SGRs) and gamma-ray pulsars (GRPs), etc.
Chen Tian Lun
Danzeng Luo-Bu
Huang Yun-Feng
Liu Dang-Bo
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