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A Herschel Spectroscopic Survey of Warm Molecular Gas in Local Luminous Infrared Galaxies

Lu, Nanyao and Xu, C. K. and Gao, Y. and Isaak, K. and Armus, L. and Appleton, P. and Charmandaris, V. and Díaz-Santos, T. and Evans, A. and Howell, J. and Iwasawa, K. and Leech, J. and Lord, S. and Mazzarella, J. and Petric, A. and Sanders, D. and Schulz, B. and Surace, J. and van der Werf, P. and Zhao, Y. (2013) A Herschel Spectroscopic Survey of Warm Molecular Gas in Local Luminous Infrared Galaxies. In: Galaxy Mergers in an Evolving Universe. Astronomical Society of the Pacific Conference Series. No.477. Astronomical Society of the Pacific , San Francisco, CA, pp. 31-35. ISBN 978-1-58381-838-1.

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We describe an on-going Herschel 200–700 μm spectroscopic survey of a flux-limited sample of 125 local luminous infrared galaxies (LIRGs), targeting primarily at CO line emission from warm and dense molecular gas. The program will provide important statistical data on the interplay between warm molecular gas, IR luminosity, star formation rate and efficiency, AGN, and the diverse properties of LIRGs. Of the 30 sample galaxies observed so far (18 by us; 12 taken from Herschel archive), about 15% show a dominant or significant hot CO gas component emitting at J > 10, that is likely heated by AGN. The other 85% is dominated by a warm gas component with CO line emission peaking at J ≤ 8, likely powered by starburst. While the spectral shapes of the warm gas component show little overall dependence on the total IR luminosity L_(IR), the relative contribution from the hot component appears to correlate positively with L_(IR). The tightest one-to-one correlation between CO line luminosity and L_(IR) seems to be for CO(7-6), implying that the bulk of L_(IR) should be correlated with warm molecular gas of such density and temperature that its CO line emission peaks around J ∼ 7.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Lu, Nanyao0000-0002-8948-1044
Xu, C. K.0000-0002-1588-6700
Gao, Y.0000-0003-0007-2197
Armus, L.0000-0003-3498-2973
Appleton, P.0000-0002-7607-8766
Charmandaris, V.0000-0002-2688-1956
Díaz-Santos, T.0000-0003-0699-6083
Evans, A.0000-0003-2638-1334
Iwasawa, K.0000-0002-4923-3281
Mazzarella, J.0000-0002-8204-8619
Petric, A.0000-0003-4030-3455
Sanders, D.0000-0002-1233-9998
Surace, J.0000-0001-7291-0087
van der Werf, P.0000-0001-5434-5942
Zhao, Y.0000-0002-9128-818X
Additional Information:© 2013 Astronomical Society of the Pacific. This work is based (in part) on observations made with Herschel, a European Space Agency Cornerstone Mission with significant participation by NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Series Name:Astronomical Society of the Pacific Conference Series
Issue or Number:477
Record Number:CaltechAUTHORS:20140114-112608067
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43358
Deposited By: Ruth Sustaita
Deposited On:14 Jan 2014 21:27
Last Modified:05 Nov 2019 06:06

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