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Jimenez-Andrade, E. F., Magnelli, B., Karim, A., Jones, G. C., Carilli, C. L., Romano-Diaz, E., Gomez-Guijarro, C., Toft, S., Bertoldi, F., Riechers, D. A., Schinnerer, E., Sargent, M., Michalowski, M. J., Fraternali, F., Staguhn, J. G., Smolcic, V, Aravena, M., Harrington, K. C., Sheth, K., Capak, P. L., Koekemoer, A. M., van Kampen, E., Swinbank, M., Zirm, A., Magdis, G. E. and Navarrete, F. (2018). Molecular gas in AzTEC/C159: a star-forming disk galaxy 1.3 Gyr after the Big Bang. Astron. Astrophys., 615. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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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 (CO)-C-12 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 similar to 750 km s(-1)) and tentative double-peaked profiles of the two (CO)-C-12 lines are consistent with an extended molecular gas reservoir, which is distributed in a rotating disk, as previously revealed from [CII] 158 mu m line observations. Based on the (CO)-C-12(2 -> 1) emission line, we derived L'(CO) = (3.4 +/- 0.6) x 10(10) Kkm s(-1) pc(2), which yields a molecular gas mass of M-H2 (alpha(CO) = 4.3) = (1. 5 +/- 0.3) x 10(11) M-circle dot and unveils a gas-rich system with mu(gas)(alpha(CO) = 4.3) equivalent to M-H2 = M-* = 3.3 +/- 0.7. The extreme star formation efficiency of AzTEC/C159, parametrized by the ratio L-IR = L'(CO) = (216 +/- 80) L-circle dot(K km s(-1) pc(2))(-1), is comparable to merger-driven starbursts such as local ultra-luminous infrared galaxies and SMGs. Likewise, the (CO)-C-12(5 -> 4)/CO(2 -> 1) line brightness temperature ratio of r(52) = 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 0 CO -H2 mass conversion factor in AzTEC/C159, that is, alpha(CO) = 3.9(-1.3)(+2.7) M-circle dot 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 similar to 2.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jimenez-Andrade, E. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Magnelli, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karim, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jones, G. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Carilli, C. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Romano-Diaz, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gomez-Guijarro, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Toft, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bertoldi, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Riechers, D. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schinnerer, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sargent, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michalowski, M. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fraternali, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Staguhn, J. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smolcic, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Aravena, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Harrington, K. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sheth, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Capak, P. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koekemoer, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED van Kampen, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Swinbank, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zirm, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Magdis, G. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Navarrete, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-179938
DOI:	10.1051/0004-6361/201732186
Journal or Publication Title:	Astron. Astrophys.
Volume:	615
Date:	2018
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LUMINOUS INFRARED GALAXIES; HIGH-REDSHIFT GALAXIES; LAMBDA-CDM UNIVERSE; HUBBLE-DEEP-FIELD; SUBMILLIMETER GALAXIES; BILLION YEARS; PHOTOMETRIC REDSHIFTS; MILLIMETER SURVEY; CONVERSION FACTOR; SUBMM GALAXIES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17993