Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.128..341p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 128, no. 2, Dec. 1986, p. 341-354.
Astronomy and Astrophysics
Astrophysics
16
Gamma Ray Bursts, Neutron Stars, Stellar Radiation, Synchrotron Radiation, Thermal Radiation, Absorptivity, Emissivity, Luminosity, Spectrum Analysis
Scientific paper
It is shown that the standard classical expressions for the thermal synchrotron (TS) radiation from an optically thin thermal plasma are inapplicable at photon energies E greater than about kT since they neglect quantum effects. Quantum relationships are obtained for the TS spectral emissivity, opacity, and polarization. The quantum TS spectra are much softer at energies above kT than the classical ones. The TS radiation exhibits strong linear polarization in the classical domain, whereas the quantum effects reduce the polarization at high E. Fitting the gamma-ray burst (GRB) spectra by the clasical TS law is incorrect where kT is less than the maximum detected photon energy. The continua of the GRB spectra in the energy range from 20 keV to 2 MeV can be fitted satisfactorily by the quantum TS spectra. The results of this fitting may suggest the existence of temperatures much higher (up to about 10 MeV), and of magnetic fields much lower (down to about 10 to the 9 G) than those usually accepted.
Golenetskii Sergey V.
Pavlov George G.
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