MAGNETIC STRUCTURES IN GAMMA-RAY BURST JETS PROBED BY GAMMA-RAY POLARIZATION

被引：118

作者：

Yonetoku, Daisuke ^{[1
]}

Murakami, Toshio ^{[1
]}

Gunji, Shuichi ^{[2
]}

Mihara, Tatehiro ^{[3
]}

Toma, Kenji ^{[4
]}

Morihara, Yoshiyuki ^{[1
]}

Takahashi, Takuya ^{[1
]}

Wakashima, Yudai ^{[1
]}

Yonemochi, Hajime ^{[1
]}

Sakashita, Tomonori ^{[1
]}

Toukairin, Noriyuki ^{[2
]}

Fujimoto, Hirofumi ^{[1
]}

Kodama, Yoshiki ^{[1
]}

机构：

[1] Kanazawa Univ, Sch Math & Phys, Coll Sci & Engn, Kanazawa, Ishikawa 9201192, Japan

[2] Yamagata Univ, Dept Phys, Fac Sci, Yamagata 9908560, Japan

[3] RIKEN, Cosm Radiat Lab, Wako, Saitama 3510198, Japan

[4] Osaka Univ, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 758卷 / 01期

关键词：

gamma-ray burst: individual (GRB 110301A; GRB; 110721A); instrumentation: polarimeters; polarization; radiation mechanisms: non-thermal; relativistic processes; PROMPT EMISSION; GRB; 041219A; ABOARD; GRB-021206; AFTERGLOWS; TURBULENCE; IKAROS; MODEL;

D O I：

10.1088/2041-8205/758/1/L1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report polarization measurements in two prompt emissions of gamma-ray bursts, GRB 110301A and GRB 110721A, observed with the gamma-ray burst polarimeter (GAP) on borad the IKAROS solar sail mission. We detected linear polarization signals from each burst with polarization degree of Pi = 70 +/- 22% with statistical significance of 3.7 sigma for GRB 110301A, and Pi = 84(-28)(+16)% with 3.3 sigma confidence level for GRB 110721A. We did not detect any significant change of polarization angle. These two events had shorter durations and dimmer brightness compared with GRB 100826A, which showed a significant change of polarization angle, as reported in Yonetoku et al. Synchrotron emission model can be consistent with the data of the three GRBs, while the photospheric quasi-thermal emission model is not favored. We suggest that magnetic field structures in the emission region are globally ordered fields advected from the central engine.

引用

页数：5

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