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Infalling gas in a Lyman-alpha blob

文献类型：期刊论文

作者Ao, Yiping2,3,4,5; Zheng, Zheng6; Henkel, Christian7,8; Nie, Shiyu6; Beelen, Alexandre9; Cen, Renyue10; Dijkstra, Mark11; Francis, Paul J.12,13; Geach, James E.14; Kohno, Kotaro15
刊名NATURE ASTRONOMY
出版日期2020-03-09
页码5
ISSN号2397-3366
DOI10.1038/s41550-020-1033-3
英文摘要Lyman-alpha blobs (LABs) are spatially extended nebulae of emission in the Lyman-alpha (Ly alpha) line of hydrogen, seen at high redshifts(1,2), and most commonly found in the dense environment of star-forming galaxies(3,4). A recent study showed that nearly 100% of the sky is covered by Ly alpha emission around high-redshift galaxies(5-7). The origin of Ly alpha emission in the LABs is still unclear and under debate(8). It may be powered by photoionization involving galactic superwinds/outflows, resonant scattering of Ly alpha photons from starbursts or active galactic nuclei(9-16), or by cooling radiation from cold streams of gas accreting onto galaxies(17,18), as demonstrated by recent simulations(19). Here we analyse the gas kinematics within a LAB, providing rare observational evidence for infalling gas. This is consistent with the release of gravitational accretion energy as cold streams radiate Ly alpha photons. It also provides direct evidence for possible cold streams feeding the central galaxies. The mass of the infalling gas is not important in comparison to the gas mass consumed by star formation, and is also not the major powering source of Ly alpha emission, but it hints at another mechanism to explain the origin of the extended Ly alpha emission around young galaxies. The gas kinematics within a Lyman-alpha blob show clear evidence of infall, consistent with the release of gravitational accretion energy as cold streams radiate Lyman-alpha photons. These cold streams are apparently responsible for feeding central galaxies.
WOS关键词COLD ACCRETION ; STAR-FORMATION ; GALAXIES ; ESCAPE ; HALOES
资助项目NSFC[11988101] ; NSFC[11933011] ; NSFC[11373007] ; Royal Society University Research Fellowship ; ESO programme[297.A-5059(A)] ; ESO programme[082.A-0846(B)] ; Spanish MINECO[AyA2014-55216]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者NATURE PUBLISHING GROUP
WOS记录号WOS:000518736500005
资助机构NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; ESO programme ; ESO programme ; Spanish MINECO ; Spanish MINECO ; NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; ESO programme ; ESO programme ; Spanish MINECO ; Spanish MINECO ; NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; ESO programme ; ESO programme ; Spanish MINECO ; Spanish MINECO ; NSFC ; NSFC ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; ESO programme ; ESO programme ; Spanish MINECO ; Spanish MINECO
源URL[http://ir.bao.ac.cn/handle/114a11/56232]  
专题中国科学院国家天文台
通讯作者Ao, Yiping
作者单位1.Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR 7095, Paris, France
2.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing, Peoples R China
4.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei, Peoples R China
5.Natl Astron Observ Japan, Mitaka, Tokyo, Japan
6.Univ Utah, Dept Phys & Astron, Salt Lake City, UT USA
7.Max Planck Inst Radioastron, Bonn, Germany
8.King Abdulaziz Univ, Astron Dept, Jeddah, Saudi Arabia
9.Univ Paris Saclay, Univ Paris Sud, Inst Astrophys Spatiale, CNRS,UMR 8617, Orsay, France
10.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
推荐引用方式
GB/T 7714		 Ao, Yiping,Zheng, Zheng,Henkel, Christian,et al. Infalling gas in a Lyman-alpha blob[J]. NATURE ASTRONOMY,2020:5.
APA Ao, Yiping.,Zheng, Zheng.,Henkel, Christian.,Nie, Shiyu.,Beelen, Alexandre.,...&Weiss, Axel.(2020).Infalling gas in a Lyman-alpha blob.NATURE ASTRONOMY,5.
MLA Ao, Yiping,et al."Infalling gas in a Lyman-alpha blob".NATURE ASTRONOMY (2020):5.

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来源：国家天文台

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