Radio emission from the unusual supernova 1998bw and its associialion with the γ-ray burst of 25 April 1998

被引:560
作者
Kulkarni, SR [1 ]
Frail, DA
Wieringa, MH
Ekers, RD
Sadler, EM
Wark, RM
Higdon, JL
Phinney, ES
Bloom, JS
机构
[1] CALTECH 105 24, Div Phys Math & Astron, Pasadena, CA 91125 USA
[2] Natl Radio Astron Observ, Socorro, NM 87801 USA
[3] CSIRO, Australia Telescope Natl Facil, Narrabri, NSW 2390, Australia
[4] CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
[5] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
[6] CALTECH 130 33, Div Phys Math & Astron, Pasadena, CA 91125 USA
关键词
D O I
10.1038/27139
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Data accumulated over the past year strongly favour the idea that gamma-ray bursts lie at cosmological distances, although the nature of the power source remains unclear. Here we report radio observations of the supernova SN1998bw, which exploded at about the same time, and in about the same direction, as the gamma-ray burst GRB980425, At its peak, the supernova was unusually luminous at radio wavelengths. A simple interpretation of the data requires that the source expanded with an apparent velocity of at least twice the speed of light, indicating that the supernova was accompanied by a shock wave moving at relativistic speeds (the ejects of supernovae are typically characterized by non-relativistic velocities). The energy of the shock is at least 10(49) erg, with an inferred ejecta mass of 10(-5) solar masses, and we suggest that the early phase of this shock wave produced the burst of gamma-rays, Although In general the properties of supernovae are very different from those of gamma-ray bursts, we argue that this unusual supernova establishes a second class of gamma-ray burst, which Is distinctly different from the cosmological kind.
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页码:663 / 669
页数:7
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