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SHORT GAMMA-RAY BURSTS: THE MASS OF THE ACCRETION DISK AND THE INITIAL RADIUS OF THE OUTFLOW
Fan, Yi-Zhong ; Wei, Da-Ming
2011
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume739Issue:1Pages:47(7)
AbstractIn this work, we estimate the accretion-disk mass in the specific scenario of binary-neutron-star merger with current observational data. Assuming that the outflows of short gamma-ray bursts (GRBs) are driven via neutrino-antineutrino annihilation we estimate the disk mass of about half of short bursts in the sample to be similar to 0.01-0.1M(circle dot), in agreement with that obtained in the numerical simulations. Massive disks (similar to several 0.1M(circle dot)) found in some other short GRBs may point to the more efficient magnetic process of extracting energy or the neutron star and black hole binary progenitor. Our results suggest that some short bursts may be really due to the coalescence of double neutron stars and are promising gravitational wave radiation sources. For future short GRBs with simultaneous gravitational-wave detections, the disk mass may be reliably inferred and the validity of our approach will be tested. We also propose a method to constrain the initial radius of a baryonic outflow where it is launched (R(0)) without the need of identifying an ideal thermal spectrum component. We then apply it to GRB 090510 and get R(0) less than or similar to 6.5 x 10(6)(Gamma(ph)/2000)(-4) cm, suggesting that the central engine is a black hole with a mass < 22M circle dot (Gamma(ph)/2000)(-4), where Gamma(ph) is the bulk Lorentz factor of the outflow at the photospheric radius.
KeywordHigh-energy Emission Internal-shock Model Short Grb 090510 Black-holes Neutron-stars Relativistic Outflows Photospheric Emission Optical Afterglow Physical Origins Magnetic-fields
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4548
Collection宇宙伽马暴、中子星及相关物理研究团组
Recommended Citation
GB/T 7714
Fan, Yi-Zhong,Wei, Da-Ming. SHORT GAMMA-RAY BURSTS: THE MASS OF THE ACCRETION DISK AND THE INITIAL RADIUS OF THE OUTFLOW[J]. ASTROPHYSICAL JOURNAL,2011,739(1):47(7).
APA Fan, Yi-Zhong,&Wei, Da-Ming.(2011).SHORT GAMMA-RAY BURSTS: THE MASS OF THE ACCRETION DISK AND THE INITIAL RADIUS OF THE OUTFLOW.ASTROPHYSICAL JOURNAL,739(1),47(7).
MLA Fan, Yi-Zhong,et al."SHORT GAMMA-RAY BURSTS: THE MASS OF THE ACCRETION DISK AND THE INITIAL RADIUS OF THE OUTFLOW".ASTROPHYSICAL JOURNAL 739.1(2011):47(7).
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