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  Molecular gas in AzTEC/C159: a star-forming disk galaxy 1.3 Gyr after the Big Bang

Jiménez-Andrade, E. F., Magnelli, B., Karim, A., Jones, G. C., Carilli, C. L., Romano-Díaz, E., et al. (2018). Molecular gas in AzTEC/C159: a star-forming disk galaxy 1.3 Gyr after the Big Bang. Astronomy and Astrophysics, 615.

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Jiménez-Andrade, E. F.1, Author
Magnelli, B.1, Author
Karim, A.1, Author
Jones, G. C.1, Author
Carilli, C. L.1, Author
Romano-Díaz, E.1, Author
Gómez-Guijarro, C.1, Author
Toft, S.1, Author
Bertoldi, F.1, Author
Riechers, D. A.1, Author
Schinnerer, E.1, Author
Sargent, M.1, Author
Michałowski, M. J.1, Author
Fraternali, F.1, Author
Staguhn, J. G.1, Author
Smolčić, V.1, Author
Aravena, M.1, Author
Harrington, K. C.1, Author
Sheth, K.1, Author
Capak, P. L.1, Author
Koekemoer, A. M.1, Authorvan Kampen, E.1, AuthorSwinbank, M.1, AuthorZirm, A.1, AuthorMagdis, G. E.1, AuthorNavarrete, F.1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: high-redshift galaxies: formation galaxies: ISM ISM: molecules Astrophysics - Astrophysics of Galaxies
 Abstract: We studied the molecular gas properties of AzTEC/C159, a star-forming disk galaxy at z = 4.567, in order to better constrain the nature of the high-redshift end of the submillimeter-selected galaxy (SMG) population. We secured 12CO molecular line detections for the J = 2 →1 and J = 5 →4 transitions using the Karl G. Jansky Very Large Array (VLA) and the NOrthern Extended Millimeter Array (NOEMA) interferometer. The broad (FWHM 750 km s-1) and tentative double-peaked profiles of the two 12CO lines are consistent with an extended molecular gas reservoir, which is distributed in a rotating disk, as previously revealed from [CII] 158 μm line observations. Based on the 12CO(2 →1) emission line, we derived L'CO=(3.4±0.6)×1010 K km s-1 pc2, which yields a molecular gas mass of MH2CO/4.3)=(1.5±0.3)×1011 M and unveils a gas-rich system with μgasC O/4.3)≡MH2/M=3.3±0.7. The extreme star formation efficiency of AzTEC/C159, parametrized by the ratio LIR/L'CO=(216±80) L (K km s-1 pc2)-1, is comparable to merger-driven starbursts such as local ultra-luminous infrared galaxies and SMGs. Likewise, the 12CO(5 →4)/CO(2 →1) line brightness temperature ratio of r52 = 0.55 ± 0.15 is consistent with high-excitation conditions as observed in SMGs. Based on mass budget considerations, we constrained the value for the L'CO - H2 mass conversion factor in AzTEC/C159, that is, αCO=3.9-1.3+2.7 M K-1 km-1 s pc-2, which is consistent with a self-gravitating molecular gas distribution as observed in local star-forming disk galaxies. Cold gas streams from cosmological filaments might be fueling a gravitationally unstable gas- rich disk in AzTEC/C159, which breaks into giant clumps and forms stars as efficiently as in merger-driven systems and generates high gas excitation. These results support the evolutionary connection between AzTEC/C159-like systems and massive quiescent disk galaxies at z 2.

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 Dates: 2018
 Publication Status: Issued
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 615 Sequence Number: - Start / End Page: - Identifier: -