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  Physical characterization of serendipitously uncovered millimeter-wave line-emitting galaxies at z ∼ 2.5 behind the local luminous infrared galaxy VV 114

Mizukoshi, S., Kohno, K., Egusa, F., Hatsukade, B., Minezaki, T., Saito, T., et al. (2021). Physical characterization of serendipitously uncovered millimeter-wave line-emitting galaxies at z ∼ 2.5 behind the local luminous infrared galaxy VV 114. The Astrophysical Journal, 917(2): 94. doi:10.3847/1538-4357/ac01cc.

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Physical characterization of serendipitously uncovered millimeter-wave line-emitting galaxies at z ∼ 2.5 behind the local luminous infrared galaxy VV 114.pdf (Any fulltext), 3MB
 
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Physical characterization of serendipitously uncovered millimeter-wave line-emitting galaxies at z ∼ 2.5 behind the local luminous infrared galaxy VV 114.pdf
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Mizukoshi, Shoichiro, Author
Kohno, Kotaro, Author
Egusa, Fumi, Author
Hatsukade, Bunyo, Author
Minezaki, Takeo, Author
Saito, Toshiki, Author
Tamura, Yoichi, Author
Iono, Daisuke, Author
Ueda, Junko, Author
Matsuda, Yuichi, Author
Kawabe, Ryohei, Author
Lee, Minju M.1, Author           
Yun, Min S., Author
Espada, Daniel, Author
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1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We present a detailed investigation of millimeter-wave line emitters ALMA J010748.3-173028 (ALMA-J0107a) and ALMA J010747.0-173010 (ALMA-J0107b), which were serendipitously uncovered in the background of the nearby galaxy VV114 with spectral scan observations at λ = 2 - 3 mm. Via Atacama Large Millimeter/submillimeter Array (ALMA) detection of CO(4-3), CO(3-2), and [CI](1-0) lines for both sources, their spectroscopic redshifts are unambiguously determined to be z=2.4666±0.0002 and z=2.3100±0.0002, respectively. We obtain the apparent molecular gas masses Mgas of these two line emitters from [CI] line fluxes as (11.2±3.1)×1010M and (4.2±1.2)×1010M, respectively. The observed CO(4-3) velocity field of ALMA-J0107a exhibits a clear velocity gradient across the CO disk, and we find that ALMA-J0107a is characterized by an inclined rotating disk with a significant turbulence, that is, a deprojected maximum rotation velocity to velocity dispersion ratio vmaxv of 1.3±0.3. We find that the dynamical mass of ALMA-J0107a within the CO-emitting disk computed from the derived kinetic parameters, (1.1±0.2)×1010 M, is an order of magnitude smaller than the molecular gas mass derived from dust continuum emission, (3.2±1.6)×1011 M. We suggest this source is magnified by a gravitational lens with a magnification of μ≳10, which is consistent with the measured offset from the empirical correlation between CO-line luminosity and width.

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 Dates: 2021-08-23
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ac01cc
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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: 917 (2) Sequence Number: 94 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3