Chromatic signatures in the microlensing of gamma-ray burst afterglows

被引:31
作者
Granot, J [1 ]
Loeb, A
机构
[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
gamma rays : bursts; gravitational lensing;
D O I
10.1086/319843
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We calculate the radial surface brightness profile of the image of a gamma-ray burst (GRB) afterglow. The afterglow spectrum consists of several power-law segments separated by breaks. The image profile changes considerably across each of the spectral breaks. It also depends on the density profile of the ambient medium into which the GRB fireball propagates. Gravitational microlensing by an intervening star can resolve the afterglow image. We calculate the predicted magnification history of GRB afterglows as a function of observed frequency and ambient medium properties. We find that intensive monitoring of a microlensed afterglow light curve can be used to reconstruct the parameters of the fireball and its environment and provide constraints on particle acceleration and magnetic field amplification in relativistic blast waves.
引用
收藏
页码:L63 / L66
页数:4
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