Infalling gas in a Lyman-alpha blob
文献类型:期刊论文
作者 | Ao, Yiping8,10,11,12; Zheng, Zheng13; Henkel, Christian7,14; Nie, Shiyu13; Beelen, Alexandre4; Cen, Renyue3; Dijkstra, Mark1; Francis, Paul J.9,15; Geach, James E.2; Kohno, Kotaro6 |
刊名 | NATURE ASTRONOMY |
出版日期 | 2020-03-09 |
页码 | 5 |
ISSN号 | 2397-3366 |
DOI | 10.1038/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/114a11/56229] |
专题 | 中国科学院国家天文台 |
通讯作者 | Ao, Yiping |
作者单位 | 1.Univ Oslo, Inst Theoret Astrophys, Oslo, Norway 2.Univ Hertfordshire, Sch Phys Astron & Math, Ctr Astrophys Res, Hatfield, Herts, England 3.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA 4.Univ Paris Saclay, Univ Paris Sud, Inst Astrophys Spatiale, CNRS,UMR 8617, Orsay, France 5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China 6.Univ Tokyo, Inst Astron, Mitaka, Tokyo, Japan 7.King Abdulaziz Univ, Astron Dept, Jeddah, Saudi Arabia 8.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China 9.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT, Australia 10.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei, Peoples R China |
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. |
入库方式: OAI收割
来源:国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。