Constraining the Type of Central Engine of GRBs with Swift Data
Li,Liang1,2,3; Wu,Xue-Feng1; Lei,Wei-Hua4; Dai,Zi-Gao5; Lian,En-Wei6; Ryde,Felix3
Source PublicationThe Astrophysical Journal Supplement Series
AbstractAbstract The central engine of gamma-ray bursts (GRBs) is poorly constrained. There exist two main candidates: a fast-rotating black hole and a rapidly spinning magnetar. Furthermore, X-ray plateaus are widely accepted to be the energy injection into the external shock. In this paper, we systematically analyze the Swift/XRT light curves of 101 GRBs having plateau phases and known redshifts (before 2017 May). Since a maximum energy budget (~2?×?1052 erg) exists for magnetars but not for black holes, this provides a good clue to identifying the type of GRB central engine. We calculate the isotropic kinetic energy EK,iso and the isotropic X-ray energy release EX,iso for individual GRBs. We identify three categories based on how likely a black hole harbors a central engine: “Gold” (9 out of 101; both EX,iso and EK,iso exceed the energy budget), “Silver” (69 out of 101; EX,iso less than the limit but EK,iso greater than the limit), and “Bronze” (23 out of 101; the energies are not above the limit). We then derive and test the black hole parameters with the Blandford–Znajek mechanism, and find that the observations of the black hole candidate (“Gold”?+?“Silver”) samples are consistent with the expectations of the black hole model. Furthermore, we also test the magnetar candidate (“Bronze”) sample with the magnetar model, and find that the magnetar surface magnetic field (Bp) and initial spin period (P0) fall into reasonable ranges. Our analysis indicates that if the magnetar wind is isotropic, a magnetar central engine is possible for 20% of the analyzed GRBs. For most GRBs, a black hole is most likely operating.
Keywordmethods: statistical reference systems X-rays: ISM
WOS IDIOP:0067-0049-236-2-aabaf3
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China;,
2.Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden
3.Department of Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
4.School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;
5.School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China;
6.GXU-NAOC Center for Astrophysics and Space Sciences, Department of Physics, Guanxi University, Nanning 530004, People's Republic of China
Recommended Citation
GB/T 7714
Li,Liang,Wu,Xue-Feng,Lei,Wei-Hua,et al. Constraining the Type of Central Engine of GRBs with Swift Data[J]. The Astrophysical Journal Supplement Series,2018,236(2).
APA Li,Liang,Wu,Xue-Feng,Lei,Wei-Hua,Dai,Zi-Gao,Lian,En-Wei,&Ryde,Felix.(2018).Constraining the Type of Central Engine of GRBs with Swift Data.The Astrophysical Journal Supplement Series,236(2).
MLA Li,Liang,et al."Constraining the Type of Central Engine of GRBs with Swift Data".The Astrophysical Journal Supplement Series 236.2(2018).
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