Jang, Minsung 2011 GRB 071025余辉的谱

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Title:		Dust Properties in the Afterglow of GRB 071025 at z ~ 5
Authors:		Jang, Minsung; Im, Myungshin; Lee, Induk; Urata, Yuji; Huang, Kuiyun; Hirashita, Hiroyuki; Fan, Xiaohui; Jiang, Linhua
Affiliation:		AA(Center for the Exploration of the Origin of the Universe (CEOU), Astronomy Program, Department of Physics & Astronomy, Seoul National University, Shillim-Dong, Kwanak-Gu, Seoul 151-742, Republic of Korea msjang.astro@gmail.com), AB(Center for the Exploration of the Origin of the Universe (CEOU), Astronomy Program, Department of Physics & Astronomy, Seoul National University, Shillim-Dong, Kwanak-Gu, Seoul 151-742, Republic of Korea mim@astro.snu.ac.kr), AC(Institute of Astronomy, National Central University, Chung-Li 32054, Taiwan ), AD(Institute of Astronomy, National Central University, Chung-Li 32054, Taiwan ), AE(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AF(Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan ), AG(Steward Observatory, University of Arizona, Tucson, AZ, USA), AH(Steward Observatory, University of Arizona, Tucson, AZ, USA)
Publication:		The Astrophysical Journal Letters, Volume 741, Issue 1, article id. L20 (2011). (ApJL Homepage)
Publication Date:		11/2011
Origin:		IOP
Astronomy Keywords:		dust, extinction, galaxies: high-redshift, galaxies: ISM, gamma-ray burst: general, gamma-ray burst: individual: GRB 071025
DOI:		10.1088/2041-8205/741/1/L20
Bibliographic Code:		2011ApJ...741L..20J

Abstract

At high redshift, the universe is so young that core-collapse supernovae (SNe) are suspected to be the dominant source of dust production. However, some observations indicate that the dust production by SNe is an inefficient process, casting doubts on the existence of abundant SNe-dust in the early universe. Recently, Perley et al. reported that the afterglow of GRB 071025—an unusually red gamma-ray burst (GRB) at z ~ 5—shows evidence for SNe-produced dust. Since this is perhaps the only high-redshift GRB exhibiting compelling evidence for SNe-dust but the result could easily be affected by small systematics in photometry, we re-examined the extinction properties of GRB 071025 using our own optical/near-infrared data at a different epoch. In addition, we tested SNe-dust models with different progenitor masses and dust destruction efficiencies to constrain the dust formation mechanisms. By searching for the best-fit model of the afterglow spectral energy distribution, we confirm the previous claim that the dust in GRB 071025 is most likely to originate from SNe. We also find that the SNe-dust model of 13 or 25 M _sun without dust destruction fits the extinction property of GRB 071025 best, while pair-instability SNe models with a 170 M _sun progenitor poorly fit the data. Our results indicate that, at least in some systems at high redshift, SNe with intermediate initial masses within 10-30 M _sun were the main contributors for the dust enrichment, and the dust destruction effect due to reverse shock was negligible.

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