VERY HIGH EFFICIENCY PHOTOSPHERIC EMISSION IN LONG-DURATION γ-RAY BURSTS

被引：154

作者：

Lazzati, Davide ^{[1
,2
]}

Morsony, Brian J. ^{[2
,3
]}

Begelman, Mitchell C. ^{[2
,4
]}

机构：

[1] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[2] Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA

[3] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[4] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 700卷 / 01期

关键词：

gamma rays: bursts; hydrodynamics; methods: numerical; radiation mechanisms: thermal; relativity; RELATIVISTIC JETS; THERMAL EMISSION; SHOCK MODEL; SUPERNOVA; COLLAPSARS; SPECTRA; CONSTRAINTS; PROPAGATION; VARIABILITY; OUTFLOWS;

D O I：

10.1088/0004-637X/700/1/L47

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We numerically analyze the evolution of a long-duration gamma-ray burst jet as it leaves the progenitor star and propagates to the photospheric radius, where radiation can be released. We find that the interaction of the relativistic material with the progenitor star has influences well beyond the stellar surface. Tangential collimation shocks are observed throughout the jet evolution, out to about 100 stellar radii, which is the whole range of our simulation. We find that the jet is internally hot at the photospheric radius and we compute the photospheric emission. The photosphere is a very efficient radiator, capable of converting more than half of the total energy of the jet into radiation. We show that bright photospheres are a common feature of jets born inside massive progenitor stars and that this effect can explain the high radiative efficiency observed in long-duration bursts.

引用

页码：L47 / L50

页数：4

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