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FERMI OBSERVATIONS OF GRB 090510: A SHORT-HARD GAMMA-RAY BURST WITH AN ADDITIONAL, HARD POWER-LAW COMPONENT FROM 10 keV TO GeV ENERGIES
文献类型：期刊论文
| 作者 | Ackermann, M.1,2; Asano, K.3; Atwood, W. B.4,5; Axelsson, M.6,7,8; Baldini, L.9; Ballet, J.10; Barbiellini, G.11,12; Baring, M. G.13; Bastieri, D.14,15; Bechtol, K.1,2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2010-06-20 |
| 卷号 | 716期号:2页码:1178-1190 |
| 关键词 | gamma-ray burst: individual (GRB 090510) radiation mechanisms: non-thermal |
| 英文摘要 | We present detailed observations of the bright short-hard gamma-ray burst GRB 090510 made with the Gammaray Burst Monitor (GBM) and Large Area Telescope (LAT) on board the Fermi observatory. GRB 090510 is the first burst detected by the LAT that shows strong evidence for a deviation from a Band spectral fitting function during the prompt emission phase. The time-integrated spectrum is fit by the sum of a Band function with E(peak) = 3.9 +/- 0.3 MeV, which is the highest yet measured, and a hard power-law component with photon index -1.62 +/- 0.03 that dominates the emission below approximate to 20 keV and above approximate to 100 MeV. The onset of the high-energy spectral component appears to be delayed by similar to 0.1 s with respect to the onset of a component well fit with a single Band function. A faint GBM pulse and a LAT photon are detected 0.5 s before the main pulse. During the prompt phase, the LAT detected a photon with energy 30.5(-2.6)(+5.8) GeV, the highest ever measured from a short GRB. Observation of this photon sets a minimum bulk outflow Lorentz factor, Gamma greater than or similar to 1200, using simple.. opacity arguments for this GRB at redshift z = 0.903 and a variability timescale on the order of tens of ms for the approximate to 100 keV-few MeV flux. Stricter high confidence estimates imply Gamma greater than or similar to 1000 and still require that the outflows powering short GRBs are at least as highly relativistic as those of long-duration GRBs. Implications of the temporal behavior and power-law shape of the additional component on synchrotron/synchrotron self-Compton, external-shock synchrotron, and hadronic models are considered. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RELATIVISTIC COLLISIONLESS SHOCKS ; SPECTRAL COMPONENT ; PROMPT EMISSION ; STAR-FORMATION ; COSMIC-RAYS ; AFTERGLOW ; 080916C ; DURATION ; MODEL ; ACCELERATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000278459000022 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/15942]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 作者单位 | 1.Stanford Univ, Dept Phys, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA 2.Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA 3.Tokyo Inst Technol, Interact Res Ctr Sci, Meguro, Tokyo 1528551, Japan 4.Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Dept Phys, Santa Cruz, CA 95064 USA 5.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA 6.Stockholm Univ, Dept Astron, SE-10691 Stockholm, Sweden 7.Lund Observ, SE-22100 Lund, Sweden 8.Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden 9.Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy 10.Univ Paris Diderot, CNRS, CEA, CEA Saclay,Lab AIM,IRFU,Serv Astrophys, F-91191 Gif Sur Yvette, France |
| 推荐引用方式 GB/T 7714 | Ackermann, M.,Asano, K.,Atwood, W. B.,et al. FERMI OBSERVATIONS OF GRB 090510: A SHORT-HARD GAMMA-RAY BURST WITH AN ADDITIONAL, HARD POWER-LAW COMPONENT FROM 10 keV TO GeV ENERGIES[J]. ASTROPHYSICAL JOURNAL,2010,716(2):1178-1190. |
| APA | Ackermann, M..,Asano, K..,Atwood, W. B..,Axelsson, M..,Baldini, L..,...&Ziegler, M..(2010).FERMI OBSERVATIONS OF GRB 090510: A SHORT-HARD GAMMA-RAY BURST WITH AN ADDITIONAL, HARD POWER-LAW COMPONENT FROM 10 keV TO GeV ENERGIES.ASTROPHYSICAL JOURNAL,716(2),1178-1190. |
| MLA | Ackermann, M.,et al."FERMI OBSERVATIONS OF GRB 090510: A SHORT-HARD GAMMA-RAY BURST WITH AN ADDITIONAL, HARD POWER-LAW COMPONENT FROM 10 keV TO GeV ENERGIES".ASTROPHYSICAL JOURNAL 716.2(2010):1178-1190. |
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来源：紫金山天文台
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