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Cold Molecular Gas Along the Merger Sequence in Local Luminous Infrared Galaxies

Yamashita, Takuji and Komugi, Shinya and Matsuhara, Hideo and Armus, Lee and Inami, Hanae and Ueda, Junko and Iono, Daisuke and Kohno, Kotaro and Evans, Aaron S. and Arimatsu, Ko (2017) Cold Molecular Gas Along the Merger Sequence in Local Luminous Infrared Galaxies. Astrophysical Journal, 844 (2). Art. No. 96. ISSN 1538-4357. doi:10.3847/1538-4357/aa7af1.

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We present an initial result from the ^(12)CO (J = 1–0) survey of 79 galaxies in 62 local luminous and ultraluminous infrared galaxy (LIRG and ULIRG) systems obtained using the 45 m telescope at the Nobeyama Radio Observatory. This is a systematic ^(12)CO (J = 1–0) survey of the Great Observatories All-sky LIRGs Survey (GOALS) sample. The molecular gas mass of the sample is in the range 2.2 x 10^8-7.0 x 10^9 M⊙ within the central several kiloparsecs subtended by the 15” beam. A method to estimate the size of a CO gas distribution is introduced, which is combined with the total CO flux in the literature. This method is applied to part of our sample, and we find that the median CO radius is 1–4 kpc. From the early stage to the late stage of mergers, we find that the CO size decreases while the median value of the molecular gas mass in the central several-kiloparsec region is constant. Our results statistically support a scenario where molecular gas inflows toward the central region from the outer disk to replenish gas consumed by starburst, and that such a process is common in merging LIRGs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Yamashita, Takuji0000-0002-4999-9965
Armus, Lee0000-0003-3498-2973
Inami, Hanae0000-0003-4268-0393
Iono, Daisuke0000-0002-2364-0823
Kohno, Kotaro0000-0002-4052-2394
Evans, Aaron S.0000-0003-2638-1334
Additional Information:© 2017 The American Astronomical Society. Received 2015 August 28; revised 2017 May 25; accepted 2017 June 19; published 2017 July 26. We would like to thank the anonymous referee for very useful comments that helped to further improve this paper. We also would like to thank the staff at Nobeyama Radio Observatory for their support in our observations. The Nobeyama Radio Observatory is a branch of the National Astronomical Observatory of Japan, National Institutes of Natural Sciences. T.Y. acknowledges the financial support from the Global Center of Excellence Program by MEXT, Japan through the "Nanoscience and Quantum Physics" Project of the Tokyo Institute of Technology. D.I. is supported by the JSPS KAKENHI Grant Number 15H02074. This research has made use of the NASA/IPAC Extragalactic Database (NED) and the Infrared Science Archive (IRSA), which are operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Tokyo Institute of TechnologyUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)15H02074
Subject Keywords:galaxies: ISM – galaxies: starburst – ISM: molecules – radio lines: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20170728-090218203
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Official Citation:Takuji Yamashita et al 2017 ApJ 844 96
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79531
Deposited By: Tony Diaz
Deposited On:28 Jul 2017 16:13
Last Modified:15 Nov 2021 17:48

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