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题名: Dust and gas in luminous proto-cluster galaxies at z=4.05: the case for different cosmic dust evolution in normal and starburst galaxies
作者: Tan, Q.1, 2, 3, 4; Daddi, E.1; Magdis, G.5; Pannella, M.1; Sargent, M.6; Riechers, D.7; Bethermin, M.1; Bournaud, F.1; Carilli, C.8; da Cunha, E.9; Dannerbauer, H.10; Dickinson, M.11; Elbaz, D.1; Gao Yu(高煜)2, 3; Hodge, J.9; Owen, F.8; Walter, F.9
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 2014-09-01
卷号: 569
关键词: galaxies: evolution ; galaxies: high-redshift ; galaxies: starburst ; galaxies: star formation ; submillimeter: galaxies
DOI: 10.1051/0004-6361/201423905
文章类型: Article
英文摘要: We measure the dust and gas content of the three submillimeter galaxies (SMGs) in the GN20 proto-cluster at z = 4.05 using new IRAM Plateau de Bure interferometer (PdBI) CO(4-3) and 1.2-3.3 mm continuum observations. All these three SMGs are heavily dust obscured, with UV-based star formation rate (SFR) estimates significantly smaller than the ones derived from the bolometric infrared (IR), consistent with the spatial offsets revealed by HST and CO imaging. Based also on evaluations of the specific SFR, CO-to-H-2 conversion factor and gas depletion timescale, we classify all the three galaxies as starbursts (SBs), although with a lower confidence for GN20.2b that might be a later stage merging event. We place our measurements in the context of the evolutionary properties of main sequence (MS) and SB galaxies. ULIRGs have 3-5 times larger L'(CO)/M-dust and M-dust/M-star ratios than z = 0 MS galaxies, but by z similar to 2 the difference appears to be blurred, probably due to differential metallicity evolution. SB galaxies appear to slowly evolve in their L'(CO)/M-dust and M-dust/M-star ratios all the way to z > 6 (consistent with rapid enrichment of SB events), while MS galaxies rapidly increase in M-dust/M-star from z = 0 to 2 (due to gas fraction increase, compensated by a decrease of metallicities). While no IR/submm continuum detection is available for indisputably normal massive galaxies at z > 2.5, we show that if metallicity indeed decrease rapidly for these systems at z > 3 as claimed in the literature, we should expect a strong decrease of their M-dust/M-star, consistent with recent PdBI and ALMA upper limits. We conclude that the M-dust/M-star ratio could be a powerful tool for distinguishing starbursts from normal galaxies at z > 4.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STAR-FORMING GALAXIES ; MASS-METALLICITY RELATION ; LYMAN-BREAK GALAXIES ; CO-TO-H-2 CONVERSION FACTOR ; HIGH-REDSHIFT GALAXIES ; SIMILAR-TO 3 ; SPECTRAL ENERGY-DISTRIBUTIONS ; LENSED SUBMILLIMETER GALAXY ; EXTRAGALACTIC LEGACY SURVEY ; HERSCHEL REFERENCE SURVEY
收录类别: SCI
语种: 英语
WOS记录号: WOS:000343092100073
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15746
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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作者单位: 1.CEA Saclay, DSM, Irfu, Serv Astrophys, F-91191 Gif Sur Yvette, France
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Chinese Acad Sci, Grad Univ, Beijing 10049, Peoples R China
5.Univ Oxford, Dept Phys, Oxford OX1 3RH, England
6.Univ Sussex, Dept Phys & Astron, Ctr Astron, Brighton BN1 9QH, E Sussex, England
7.Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
8.Natl Radio Astron Observ, Socorro, NM 87801 USA
9.Max Planck Inst Astron, D-69117 Heidelberg, Germany
10.Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria
11.Natl Opt Astron Observ, Tucson, AZ 85719 USA
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