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Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey

Herrero-Illana, R. (author)
European Southern Observatory (ESO),Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
Privon, G. C. (author)
University of Florida,Pontificia Universidad Catolica de Chile
Evans, A. S. (author)
University of Virginia,National Radio Astronomy Observatory
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Diaz-Santos, T. (author)
Universidad Diego Portales,Diego Portales University
Perez-Torres, M. A. (author)
Universidad de Zaragoza,University of Zaragoza,Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
Alberdi, A. (author)
Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
Iwasawa, K. (author)
Universitat de Barcelona,University of Barcelona
Armus, L. (author)
California Institute of Technology (Caltech)
Aalto, Susanne, 1964 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Mazzarella, J. (author)
California Institute of Technology (Caltech)
Chu, J. (author)
Gemini Observatory North
Sanders, D. B. (author)
Atacama Large Millimeter-submillimeter Array (ALMA),University of Hawaii
Barcos-Munoz, L. (author)
University of Virginia,National Radio Astronomy Observatory
Charmandaris, V (author)
National Observatory of Athens
Linden, S. T. (author)
University of Virginia
Yoon, I (author)
National Radio Astronomy Observatory
Frayer, D. T. (author)
Green Bank Observatory
Inami, H. (author)
Kim, D-C (author)
National Radio Astronomy Observatory
Borish, H. J. (author)
University of Virginia
Conway, John, 1963 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Murphy, E. J. (author)
California Institute of Technology (Caltech),National Radio Astronomy Observatory
Song, Y. (author)
University of Virginia
Stierwalt, S. (author)
California Institute of Technology (Caltech)
Surace, J. (author)
California Institute of Technology (Caltech)
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 (creator_code:org_t)
2019-08-08
2019
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 628
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We present IRAM-30 m Telescope (CO)-C-12 and (CO)-C-13 observations of a sample of 55 luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) in the local universe. This sample is a subset of the Great Observatory All-Sky LIRG Survey (GOALS), for which we use ancillary multi-wavelength data to better understand their interstellar medium and star formation properties. Fifty-three (96%) of the galaxies are detected in (CO)-C-12, and 29 (52%) are also detected in (CO)-C-13 above a 3 sigma level. The median full width at zero intensity (FWZI) velocity of the CO line emission is 661 km s(-1), and similar to 54% of the galaxies show a multi-peak CO profile. Herschel photometric data is used to construct the far-IR spectral energy distribution of each galaxy, which are fit with a modified blackbody model that allows us to derive dust temperatures and masses, and infrared luminosities. We make the assumption that the gas-to-dust mass ratio of (U)LIRGs is comparable to local spiral galaxies with a similar stellar mass (i.e., gas/dust of mergers is comparable to their progenitors) to derive a CO-to-H-2 conversion factor of = 1.8(-0.8)(+1.3) M-circle dot (K km s(-1) pc(2))(-1); such a value is comparable to that derived for (U)LIRGs based on dynamical mass arguments. We derive gas depletion times of 400 600 Myr for the (U)LIRGs, compared to the 1.3 Gyr for local spiral galaxies. Finally, we re-examine the relationship between the (CO)-C-12/(CO)-C-13 ratio and dust temperature, confirming a transition to elevated ratios in warmer systems.

Subject headings

NATURVETENSKAP  -- Kemi -- Analytisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

Keyword

galaxies: starburst
ISM: molecules
galaxies: ISM
radio lines: galaxies
galaxies: active

Publication and Content Type

art (subject category)
ref (subject category)

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