The 2175 ? Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z?=?2.25??Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 0100.D?0649(A).
文献类型：期刊论文
| 作者 | Zafar,T.2; Heintz,K. E.3,4; Fynbo,J. P. U.4; Malesani,D.5; Bolmer,J.6; Ledoux,C.6; Arabsalmani,M.7; Kaper,L.8; Campana,S.9; Starling,R. L. C.10 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2018-06-18 |
| 卷号 | 860期号:2 |
| ISSN号 | 2041-8205 |
| 关键词 | dust, extinction galaxies: ISM gamma-ray burst: general gamma-ray burst: individual (GRB 180325A) |
| DOI | 10.3847/2041-8213/aaca3f |
| 英文摘要 | Abstract The ultraviolet (UV) extinction feature at 2175 ? is ubiquitously observed in the Galaxy but is rarely detected at high redshifts. Here we report the spectroscopic detection of the 2175 ? bump on the sightline to the γ-ray burst (GRB) afterglow GRB 180325A at z?=?2.2486, the only unambiguous detection over the past 10 years of GRB follow-up, at four different epochs with the Nordic Optical Telescope (NOT) and the Very Large Telescope (VLT)/X-shooter. Additional photometric observations of the afterglow are obtained with the Gamma-Ray burst Optical and Near-Infrared Detector (GROND). We construct the near-infrared to X-ray spectral energy distributions (SEDs) at four spectroscopic epochs. The SEDs are well described by a single power law and an extinction law with RV?≈?4.4, AV?≈?1.5, and the 2175 ? extinction feature. The bump strength and extinction curve are shallower than the average Galactic extinction curve. We determine a metallicity of [Zn/H] >??0.98 from the VLT/X-shooter spectrum. We detect strong neutral carbon associated with the GRB with equivalent width of Wr(λ 1656)?=?0.85?±?0.05. We also detect optical emission lines from the host galaxy. Based on the Hα emission-line flux, the derived dust-corrected star formation rate is ～46?±?4 M⊙ yr?1 and the predicted stellar mass is log M*/M⊙?～?9.3?±?0.4, suggesting that the host galaxy is among the main-sequence star-forming galaxies. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-860-2-AACA3F |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/35549]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía, s/n, E-18008 Granada, Spain 2.Australian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, Australia; tayyaba.zafar@aao.gov.au 3.Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavík, Iceland 4.The Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen ?, Denmark 5.Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen ?, Denmark 6.European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago de Chile, Chile 7.Université Paris Diderot, AIM, Sorbonne Paris Cité, CEA, CNRS, F-91191 Gif-sur-Yvette, France 8.Astronomical Institute Anton Pannekoek, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, the Netherlands 9.INAF—Osservatorio astronomico di Brera, Via E. Bianchi 46, Merate (LC) I-23807, Italy 10.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK |
| 推荐引用方式 GB/T 7714 | Zafar,T.,Heintz,K. E.,Fynbo,J. P. U.,et al. The 2175 ? Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z?=?2.25??Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 0100.D?0649(A).[J]. The Astrophysical Journal Letters,2018,860(2). |
| APA | Zafar,T..,Heintz,K. E..,Fynbo,J. P. U..,Malesani,D..,Bolmer,J..,...&Xu,D..(2018).The 2175 ? Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z?=?2.25??Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 0100.D?0649(A)..The Astrophysical Journal Letters,860(2). |
| MLA | Zafar,T.,et al."The 2175 ? Extinction Feature in the Optical Afterglow Spectrum of GRB 180325A at z?=?2.25??Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 0100.D?0649(A).".The Astrophysical Journal Letters 860.2(2018). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。