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题名: PopIII signatures in the spectra of PopII/I GRBs
作者: Ma, Q.1, 2, 3; Maio, U.4, 5; Ciardi, B.1; Salvaterra, R.6
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2015-05-21
卷号: 449, 期号:3, 页码:3006-3014
关键词: gamma-ray burst: general ; galaxies: high-redshift ; cosmology: theory ; early Universe
学科分类: 天文和天体物理
DOI: 10.1093/mnras/stv477
文章类型: Article
英文摘要: We investigate signatures of Population III (PopIII) stars in the metal-enriched environment of gamma-ray bursts (GRBs) originating from Population II-I (PopII/I) stars by using abundance ratios derived from numerical simulations that follow stellar evolution and chemical enrichment. We find that at z > 10 more than 10 per cent of PopII/I GRBs explode in a medium previously enriched by PopIII stars (we refer to them as GRBII -> III). Although the formation of GRBII -> III is more frequent than that of pristine PopIII GRBs (GRBIIIs), we find that the expected GRBII -> III observed rate is comparable to that of GRBIIIs, due to the usually larger luminosities of the latter. GRBII. III events take place preferentially in small protogalaxies with stellar masses M-star similar to 10(4.5) - 10(7) M-circle dot, star formation rates SFR similar to 10(-3) - 10(-1) M-circle dot yr(-1) and metallicities Z similar to 10(-4) - 10(-2) Z(circle dot). On the other hand, galaxies with Z < 10(-2.8) Z(circle dot) are dominated by metal enrichment from PopIII stars and should preferentially host GRBII. III. Hence, measured GRB metal content below this limit could represent a strong evidence of enrichment by pristine stellar populations. We discuss how to discriminate PopIII metal enrichment on the basis of various abundance ratios observable in the spectra of GRBs' afterglows. By employing such analysis, we conclude that the currently known candidates at redshift z similar or equal to 6 - i.e. GRB 050904 and GRB 130606A - are likely not originated in environments pre-enriched by PopIII stars. Abundance measurements for GRBs at z similar or equal to 5 - such as GRB 100219A and GRB 111008A - are still poor to draw definitive conclusions, although their hosts seem to be dominated by PopII/I pollution and do not show evident signatures of massive PopIII pre-enrichment.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: GAMMA-RAY BURST ; POPULATION-III STARS ; METAL-POOR STARS ; INTERMEDIATE-MASS STARS ; HIGH-REDSHIFT GRBS ; 1ST STARS ; COSMIC REIONIZATION ; CHEMICAL ENRICHMENT ; HOST GALAXIES ; INTERGALACTIC MEDIUM
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000355337800062
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14807
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Max Planck Inst Astrophys, D-85748 Garching, Germany
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.INAF Osservatorio Astronom Trieste, I-34131 Trieste, Italy
5.Leibniz Inst Astrophys, D-14482 Potsdam, Germany
6.IASF Milano, INAF, I-20133 Milan, Italy
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