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DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A
文献类型：期刊论文
| 作者 | Ackermann, M.2,3; Ajello, M.2,3; Asano, K.4; Axelsson, M.5,6,7; Baldini, L.1; Ballet, J.8; Barbiellini, G.9,10; Baring, M. G.11; Bastieri, D.12,13; Bechtol, K.2,3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2011-03-10 |
| 卷号 | 729期号:2页码:114(12pp) |
| ISSN号 | 0004-637X |
| 关键词 | gamma-ray burst: individual (GRB 090926A) |
| 英文摘要 | We report on the observation of the bright, long gamma-ray burst, GRB 090926A, by the Gamma-ray Burst Monitor and Large Area Telescope (LAT) instruments on board the Fermi Gamma-ray Space Telescope. GRB 090926A shares several features with other bright LAT bursts. In particular, it clearly shows a short spike in the light curve that is present in all detectors that see the burst, and this in turn suggests that there is a common region of emission across the entire Fermi energy range. In addition, while a separate high-energy power-law component has already been observed in other gamma-ray bursts, here we report for the first time the detection with good significance of a high-energy spectral break (or cutoff) in this power-law component around 1.4 GeV in the time-integrated spectrum. If the spectral break is caused by opacity to electron-positron pair production within the source, then this observation allows us to compute the bulk Lorentz factor for the outflow, rather than a lower limit. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GAMMA-RAY BURSTS ; LARGE-AREA TELESCOPE ; FERMI OBSERVATIONS ; LORENTZ FACTOR ; GEV EMISSION ; AFTERGLOW ; SWIFT ; 080916C ; IDENTIFICATION ; RADIATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000288608700037 |
| 公开日期 | 2012-08-07 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/4475]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 作者单位 | 1.Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy 2.Stanford Univ, Dept Phys, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA 3.Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA 4.Tokyo Inst Technol, Interact Res Ctr Sci, Meguro, Tokyo 1528551, Japan 5.Stockholm Univ, Dept Astron, SE-10691 Stockholm, Sweden 6.Lund Observ, SE-22100 Lund, Sweden 7.Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden 8.Univ Paris 06, CEA Saclay, Serv Astrophys, Lab AIM,CEA,IRFU,CNRS, F-91191 Gif Sur Yvette, France 9.Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy 10.Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy |
| 推荐引用方式 GB/T 7714 | Ackermann, M.,Ajello, M.,Asano, K.,et al. DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A[J]. ASTROPHYSICAL JOURNAL,2011,729(2):114(12pp). |
| APA | Ackermann, M..,Ajello, M..,Asano, K..,Axelsson, M..,Baldini, L..,...&Ziegler, M..(2011).DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A.ASTROPHYSICAL JOURNAL,729(2),114(12pp). |
| MLA | Ackermann, M.,et al."DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A".ASTROPHYSICAL JOURNAL 729.2(2011):114(12pp). |
入库方式： OAI收割
来源：紫金山天文台
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