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Star-formation rates of two GRB host galaxies at z similar to 2 and a [Cii] deficit observed with ALMA
Hashimoto, Tetsuya1; Hatsukade, Bunyo2; Goto, Tomotsugu1; Kim, Seong Jin1; Ohta, Kouji3; Nagao, Tohru4; Kong, Albert K. H.1; Nakanishi, Kouichiro5,6; Mao JR(毛基荣)7,8
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2019-10-01
Volume488Issue:4Pages:5029-5041
DOI10.1093/mnras/stz2034
Contribution Rank第7完成单位
Indexed BySCI
Keywordgamma-ray burst: individual: 070521 gamma-ray burst: individual: 080207 galaxies: star formation submillimetre: galaxies
Abstract

The event rate of long gamma-ray bursts (GRBs) is expected to be a useful tracer of cosmic star-formation history. For this purpose, it is necessary to understand what kinds of star formation/galaxies are traced by GRBs. Here we report rest-frame far-infrared (FIR) continuum detections of the GRB 070521 and 080207 host galaxies at z similar to 2 with Atacama Large Millimeter/submillimeter Array (ALMA) bands 8 and 9. FIR photometry provides reliable star-formation rates (SFRs), because FIR emission is free from dust extinction and possible radio contamination from the long-lived afterglows of GRBs. Spectral energy distribution fitting yields 49.85 and 123.4 M-circle dot yr(-1) for the 070521 and 080207 hosts, respectively. The derived SFRs place them on the main sequence' of normal star-forming galaxies at z similar to 2. The derived SFRs are significantly lower than those from radio observations. It is inferred that the observed radio fluxes in a previous study are contaminated by afterglows. ALMA marginally detected the [Cii]158-mu m emission line from the GRB 080207 host galaxy with signal-to-noise ratio (S/N)similar to 4. This is the first detection of [Cii]158-mu m from a GRB host at z > 2 and the second detection among known GRBs. The luminosity ratio of [Cii]158 mu m to FIR is 7.5x10(-4), which is one of the smallest values among galaxies at z similar to 1-2 with the same FIR luminosity. The [Cii] deficit' could be a new physical property with which to characterize GRB hosts at z similar to 1-2. Possible parameters controlling the deficit include the metallicity, initial mass function and gas density.

Funding ProjectMinistry of Science and Technology of Taiwan[105-2112-M-007-003-MY3] ; Ministry of Science and Technology of Taiwan[108-2628-M-007-004-MY3] ; JSPS KAKENHI[19K03925] ; Spitzer/NASA grant RSA[1287913] ; Spanish MINECO[AYA2017-84089] ; National Natural Science Foundation of China[11673062]
Funding OrganizationMinistry of Science and Technology of Taiwan[105-2112-M-007-003-MY3, 108-2628-M-007-004-MY3] ; JSPS KAKENHI[19K03925] ; Spitzer/NASA grant RSA[1287913] ; Spanish MINECO[AYA2017-84089] ; National Natural Science Foundation of China[11673062]
Language英语
Subject Area天文学 ; 星系与宇宙学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000484349700045
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGAMMA-RAY BURST ; MASS-METALLICITY RELATION ; C-II LINE ; FORMING GALAXIES ; LIGHT CURVES ; SIMPLE-MODEL ; 158 MICRON ; EMISSION ; DUST ; REDSHIFT
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/21156
Collection丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
Corresponding AuthorHashimoto, Tetsuya
Affiliation1.Institute of Astronomy, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
2.Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
3.Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
4.Research Center for Space and Cosmic Evolution, Ehime University, Matsuyama, Ehime 790-8577, Japan
5.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
6.SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
7.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, Yunnan Province, China
8.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China
Recommended Citation
GB/T 7714
Hashimoto, Tetsuya,Hatsukade, Bunyo,Goto, Tomotsugu,et al. Star-formation rates of two GRB host galaxies at z similar to 2 and a [Cii] deficit observed with ALMA[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,488(4):5029-5041.
APA Hashimoto, Tetsuya.,Hatsukade, Bunyo.,Goto, Tomotsugu.,Kim, Seong Jin.,Ohta, Kouji.,...&Mao JR.(2019).Star-formation rates of two GRB host galaxies at z similar to 2 and a [Cii] deficit observed with ALMA.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,488(4),5029-5041.
MLA Hashimoto, Tetsuya,et al."Star-formation rates of two GRB host galaxies at z similar to 2 and a [Cii] deficit observed with ALMA".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 488.4(2019):5029-5041.
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