A magnetar powering the ordinary monster GRB 130427A?

被引：13

作者：

Bernardini, M. G. ^{[1
]}

Campana, S. ^{[1
]}

Ghisellini, G. ^{[1
]}

D'Avanzo, P. ^{[1
]}

Calderone, G. ^{[1
]}

Covino, S. ^{[1
]}

Cusumano, G. ^{[2
]}

Ghirlanda, G. ^{[1
]}

La Parola, V. ^{[2
]}

Maselli, A. ^{[2
]}

Melandri, A. ^{[1
]}

Salvaterra, R. ^{[3
]}

Burlon, D. ^{[4
,5
]}

D'Elia, V. ^{[6
]}

Fugazza, D. ^{[1
]}

Sbarufatti, B. ^{[1
]}

Vergani, S. D. ^{[7
]}

Tagliaferri, G. ^{[1
]}

机构：

[1] INAF Osservatorio Astron Brera, I-23807 Merate, LC, Italy

[2] INAF IASF Palermo, I-90146 Palermo, Italy

[3] INAF IASF Milano, I-20133 Milan, Italy

[4] Univ Sydney, Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia

[5] ARC Ctr Excellence All Sky Astrophys CAASTRO, Sydney, NSW, Australia

[6] INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, RM, Italy

[7] Univ Paris Diderot, CNRS UMR 8111, GEPI Observ Paris, F-92190 Meudon, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 439卷 / 01期

基金：

澳大利亚研究理事会;

关键词：

gamma-ray bursts: individual: GRB 130427A; stars: magnetars; GAMMA-RAY BURSTS; ENERGY INJECTION; MILLISECOND PULSARS; NEUTRON-STARS; TELESCOPE; AFTERGLOW; SUPERNOVAE; EVOLUTION; MODEL; SHOCK;

D O I：

10.1093/mnrasl/slu003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the analysis of the extraordinarily bright gamma-ray burst (GRB) 130427A under the hypothesis that the GRB central engine is an accretion-powered magnetar. In this framework, initially proposed to explain GRBs with precursor activity, the prompt emission is produced by accretion of matter on to a newly born magnetar, and the observed power is related to the accretion rate. The emission is eventually halted if the centrifugal forces are able to pause accretion. We show that the X-ray and optical afterglow is well explained as the forward shock emission with a jet break plus a contribution from the spin-down of the magnetar. Our modelling does not require any contribution from the reverse shock, that may still influence the afterglow light curve at radio and mm frequencies, or in the optical at early times. We derive the magnetic field (B similar to 10(16) G) and the spin period (P similar to 20 ms) of the magnetar and obtain an independent estimate of the minimum luminosity for accretion. This minimum luminosity results well below the prompt emission luminosity of GRB 130427A, providing a strong consistency check for the scenario where the entire prompt emission is the result of continuous accretion on to the magnetar. This is in agreement with the relatively long spin period of the magnetar. GRB 130427A was a well-monitored GRB showing a very standard behaviour and, thus, is a well-suited benchmark to show that an accretion-powered magnetar gives a unique view of the properties of long GRBs.

引用

页码：L80 / L84

页数：5

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