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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).
Zafar,T.1; Heintz,K. E.2,3; Fynbo,J. P. U.3; Malesani,D.4; Bolmer,J.5; Ledoux,C.5; Arabsalmani,M.6; Kaper,L.7; Campana,S.8; Starling,R. L. C.9; Selsing,J.4; Kann,D. A.10; Postigo,A. de Ugarte4,10; Schweyer,T.11,12; Christensen,L.4; M?ller,P.13; Japelj,J.7; Perley,D.14; Tanvir,N. R.9; D’Avanzo,P.15; Hartmann,D. H.16; Hjorth,J.4; Covino,S.17; Sbarufatti,B.18; Jakobsson,P.2; Izzo,L.10; Salvaterra,R.19; D’Elia,V.20,21; Xu,D.22
2018-06-18
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume860Issue:2
AbstractAbstract 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.
Keyworddust, extinction galaxies: ISM gamma-ray burst: general gamma-ray burst: individual (GRB 180325A)
DOI10.3847/2041-8213/aaca3f
Language英语
WOS IDIOP:2041-8205-860-2-aaca3f
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/35550
Collection中国科学院国家天文台
Affiliation1.Australian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, Australia; tayyaba.zafar@aao.gov.au
2.Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavík, Iceland
3.The Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen ?, Denmark
4.Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen ?, Denmark
5.European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago de Chile, Chile
6.Université Paris Diderot, AIM, Sorbonne Paris Cité, CEA, CNRS, F-91191 Gif-sur-Yvette, France
7.Astronomical Institute Anton Pannekoek, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, the Netherlands
8.INAF—Osservatorio astronomico di Brera, Via E. Bianchi 46, Merate (LC) I-23807, Italy
9.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
10.Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía, s/n, E-18008 Granada, Spain
11.Max-Planck Institut für Extraterrestrische Physik, Giessenbachstr. 1, D-85748 Garching, Germany
12.Technische Universit?t München, Physik Department, James-Franck-Str., D-85748 Garching, Germany
13.European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748, Garching, Germany
14.Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, IC2 Liverpool Science Park, Liverpool L3 5RF, UK
15.INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, I-23807, Merate (LC), Italy
16.Department of Physics and Astronomy, Clemson University, Clemson, SV 29634-0978, USA
17.INAF/Brera Astronomical Observatory, Via Bianchi 46, I-23807, Merate (LC), Italy
18.Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA
19.INAF—IASF/Milano, via Bassini 15, I-20133 Milano, Italy
20.Space Science Data Center—Agenzia Spaziale Italiana, via del Politecnico, s.n.c., I-00133, Roma, Italy
21.INAF—Astronomical Observatory of Rome, via Frascati 33, Monte Porzio Catone I-00040, Roma, Italy
22.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
Recommended Citation
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).
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