The high-redshift gamma-ray burst GRB 140515A A comprehensive X-ray and optical study
文献类型：期刊论文
| 作者 | Melandri, A.1; Bernardini, M. G.1; D'Avanzo, P.1; Sanchez-Ramirez, R.2,3,4; Nappo, F.1,5; Nava, L.6; Japelj, J.7; de Ugarte Postigo, A.2,8; Oates, S.2; Campana, S.1 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2015-09-01 |
| 卷号 | 581 |
| 关键词 | gamma-ray burst: general gamma-ray burst: individual: GRB 140515A galaxies: high-redshift intergalactic medium |
| 英文摘要 | High-redshift eamma-ray bursts (GRBs) offer several advantages When studying the distant Universe, providing unique information about the structure and properties of the galaxies in which they exploded. Spectroscopic identification with large ground-based telescopes has improved our knowledge of this kind of distant events. We present the multi-wavelength analysis of the high-z S'wift GRB GRB 1.40515A (z = 6.327). The best estimate of the neutral hydrogen fraction of the intergalactic medium towards the burst is X-HI <= 0.002. The spectral absorption lines detected for this event are the weakest lines ever observed in GRB afterglows, suggesting that GRB 140515A exploded in a very low-density environment. Its circtun-burst medium is characterised by an average extinction (A(V) similar to 0.1) that seems to be typical of z >= 6 events. The observed multi-band light curves are explained either with a very hard injected spectrum (p = 1.7) or with a multi-component emission (p = 2.1). In the second case a long-lasting central engine activity is needed in order to explain the late time X-ray emission. The possible origin of GRB 140515A in a Pop III (or in a Pop II star with a local environment enriched by Pop III) massive star is unlikely. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000361803900086 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5564]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.INAF Osservatorio Astron Brera, I-23807 Merate, LC, Italy 2.IAA CSIC, Granada 18008, Spain 3.Univ Basque Country, Unidad Asociada Grp Ciencias Planetarias, Dept Fis Aplicada 1, EHU,IAA,CSIC,ETS Ingn, Bilbao 48013, Spain 4.Ikerbasque, Basque Fdn Sci, Bilbao 48008, Spain 5.Univ Insubria, I-22100 Como, Italy 6.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel 7.Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia 8.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark 9.ASI Sci Data Ctr, I-00133 Rome, Italy 10.INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, RM, Italy |
| 推荐引用方式 GB/T 7714 | Melandri, A.,Bernardini, M. G.,D'Avanzo, P.,et al. The high-redshift gamma-ray burst GRB 140515A A comprehensive X-ray and optical study[J]. ASTRONOMY & ASTROPHYSICS,2015,581. |
| APA | Melandri, A..,Bernardini, M. G..,D'Avanzo, P..,Sanchez-Ramirez, R..,Nappo, F..,...&Tagliaferri, G..(2015).The high-redshift gamma-ray burst GRB 140515A A comprehensive X-ray and optical study.ASTRONOMY & ASTROPHYSICS,581. |
| MLA | Melandri, A.,et al."The high-redshift gamma-ray burst GRB 140515A A comprehensive X-ray and optical study".ASTRONOMY & ASTROPHYSICS 581(2015). |
入库方式： OAI收割
来源：国家天文台
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