| タイトル | Spectral properties of blast-wave models of gamma-ray burst sources |
| 著者（英） | Rees, M. J.; Meszaros, P.; Papathanassiou, H. |
| 著者所属（英） | NASA Headquarters; NASA Goddard Space Flight Center |
| 発行日 | 1994-09-01 |
| 言語 | eng |
| 内容記述 | We calculate the spectrum of blast-wave models of gamma-ray burst sources, for various assumptions about the magnetic field density and the relativistic particle acceleration efficiency. For a range of physically plausible models we find that the radiation efficiency is high and leads to nonthermal spectra with breaks at various energies comparable to those observed in the gamma-ray range. Radiation is also predicted at other wavebands, in particular at X-ray, optical/UV, and GeV/TeV energies. We discuss the spectra as a function of duration for three basic types of models, and for cosmological, halo, and galactic disk distances. We also evaluate the gamma-ray fluences and the spectral characteristics for a range of external densities. Impulsive burst models at cosmological distances can satisfy the conventional X-ray paucity constraint S(sub x)/S(sub gamma)less than a few percent over a wide range of durations, but galactic models can do so only for bursts shorter than a few seconds, unless additional assumptions are made. The emissivity is generally larger for bursts in a denser external environment, with the efficiency increasing up to the point where all the energy input is radiated away. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 95A72367 |
| 権利 | Copyright |
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