Infalling gas in a Lyman-alpha blob
Ao, Yiping1,2,3,4; Zheng, Zheng5; Henkel, Christian6,7; Nie, Shiyu5; Beelen, Alexandre8; Cen, Renyue9; Dijkstra, Mark10; Francis, Paul J.11,12; Geach, James E.13; Kohno, Kotaro14; Lehnert, Matthew D.15; Menten, Karl M.6; Wang, Junzhi16; Weiss, Axel6
Source PublicationNATURE ASTRONOMY

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.

Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000518736500005
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorAo, Yiping
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing, Peoples R China
3.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei, Peoples R China
4.Natl Astron Observ Japan, Mitaka, Tokyo, Japan
5.Univ Utah, Dept Phys & Astron, Salt Lake City, UT USA
6.Max Planck Inst Radioastron, Bonn, Germany
7.King Abdulaziz Univ, Astron Dept, Jeddah, Saudi Arabia
8.Univ Paris Saclay, Univ Paris Sud, Inst Astrophys Spatiale, CNRS,UMR 8617, Orsay, France
9.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
10.Univ Oslo, Inst Theoret Astrophys, Oslo, Norway
11.Australian Natl Univ, Phys Educ Ctr, Canberra, ACT, Australia
12.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT, Australia
13.Univ Hertfordshire, Sch Phys Astron & Math, Ctr Astrophys Res, Hatfield, Herts, England
14.Univ Tokyo, Inst Astron, Mitaka, Tokyo, Japan
15.Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR 7095, Paris, France
16.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China
Recommended Citation
GB/T 7714
Ao, Yiping,Zheng, Zheng,Henkel, Christian,et al. Infalling gas in a Lyman-alpha blob[J]. NATURE ASTRONOMY,2020(0):5.
APA Ao, Yiping.,Zheng, Zheng.,Henkel, Christian.,Nie, Shiyu.,Beelen, Alexandre.,...&Weiss, Axel.(2020).Infalling gas in a Lyman-alpha blob.NATURE ASTRONOMY(0),5.
MLA Ao, Yiping,et al."Infalling gas in a Lyman-alpha blob".NATURE ASTRONOMY .0(2020):5.
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