Cosmological Fast Radio Bursts from Binary Neutron Star Mergers

被引：283

作者：

Totani, Tomonori ^{[1
,2
]}

机构：

[1] Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[2] Univ Tokyo, Sch Sci, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130033, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2013年 / 65卷 / 05期

关键词：

gravitational waves; radio continuum: general; stars: binaries: general; stars: neutron; GAMMA-RAY BURSTS; COALESCENCE RATE; FLARE; FRACTION; CATALOG; PULSARS; DECAY;

D O I：

10.1093/pasj/65.5.L12

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fast radio bursts (FRBs) at cosmological distances have recently been discovered, whose duration is about milliseconds. We argue that the observed short duration is difficult to explain by giant flares of soft gamma-ray repeaters, though their event rate and energetics are consistent with FRBs. Here, we discuss binary neutron star (NS-NS) mergers as a possible origin of FRBs. The FRB rate is within the plausible range of the NS-NS merger rate and its cosmological evolution, while a large fraction of the NS-NS mergers must produce observable FRBs. A likely radiation mechanism is coherent radio emission, like radio pulsars, by magnetic braking when magnetic fields of neutron stars are synchronized to binary rotation at the time of coalescence. Magnetic fields of the standard strength (similar to 10(12-13) G) can explain the observed FRB fluxes, if the conversion efficiency from magnetic braking energy loss to radio emission is similar to that of isolated radio pulsars. Corresponding gamma-ray emission is difficult to detect by current or past gamma-ray burst satellites. Since FRBs tell us the exact time of mergers, a correlated search would significantly improve the effective sensitivity of gravitational wave detectors.

引用

页数：4

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