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  A noncorotating gas component in an extreme starburst at z = 4.3

Tadaki, K.-i., Iono, D., Yun, M. S., Aretxaga, I., Hatsukade, B., Lee, M. M., et al. (2020). A noncorotating gas component in an extreme starburst at z = 4.3. The Astrophysical Journal, 889(2): 141. doi:10.3847/1538-4357/ab64f4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-8CBE-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-8CBF-6
Genre: Journal Article

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 Creators:
Tadaki, Ken-ichi, Author
Iono, Daisuke, Author
Yun, Min S., Author
Aretxaga, Itziar, Author
Hatsukade, Bunyo, Author
Lee, Minju M.1, Author              
Michiyama, Tomonari, Author
Nakanishi, Kouichiro, Author
Saito, Toshiki, Author
Ueda, Junko, Author
Umehata, Hideki, Author
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We report the detection of a noncorotating gas component in a bright unlensed submillimeter galaxy at z = 4.3, hosting a compact starburst. Atacama Large Millimeter/submillimeter Array 0.〞17 and 0.〞09 resolution observations of [C ii] emission clearly demonstrate that the gas kinematics are characterized by an ordered rotation. After subtracting the best-fit model of a rotating disk, we kinematically identify two residual components in the channel maps. Both observing simulations and analysis of dirty images confirm that these two subcomponents are not artificially created by noise fluctuations and beam deconvolution. One of the two has a velocity offset of 200 km s−1 and a physical separation of 2 kpc from the primary disk and is located along the kinematic minor axis of disk rotation. We conclude that this gas component is falling into the galaxy from a direction perpendicular to the disk rotation. The accretion of such small noncorotating gas components could stimulate violent disk instability, driving radial gas inflows into the center of galaxies and leading to formation of in situ clumps such as identified in dust continuum and CO. We require more theoretical studies on high gas fraction mergers with mass ratio of 1: > 10 to verify this process.

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 Dates: 2020-02-03
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab64f4
Other: LOCALID: 3237807
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 889 (2) Sequence Number: 141 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3