Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey
Journal article, 2019

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.

galaxies: starburst

ISM: molecules

galaxies: ISM

radio lines: galaxies

galaxies: active


R. Herrero-Illana

European Southern Observatory (ESO)

Spanish National Research Council (CSIC)

G. C. Privon

University of Florida

Pontificia Universidad Catolica de Chile

A. S. Evans

University of Virginia

National Radio Astronomy Observatory

T. Diaz-Santos

Diego Portales University

M. A. Perez-Torres

University of Zaragoza

Spanish National Research Council (CSIC)

A. Alberdi

Spanish National Research Council (CSIC)

K. Iwasawa

University of Barcelona

L. Armus

California Institute of Technology (Caltech)

Susanne Aalto

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

J. Mazzarella

California Institute of Technology (Caltech)

J. Chu

Gemini Observatory North

D. B. Sanders

Atacama Large Millimeter-submillimeter Array (ALMA)

University of Hawaii

L. Barcos-Munoz

University of Virginia

National Radio Astronomy Observatory

V Charmandaris

National Observatory of Athens

S. T. Linden

University of Virginia

I Yoon

National Radio Astronomy Observatory

D. T. Frayer

Green Bank Observatory

H. Inami

NOAA, 950 North Cherry Ave

D-C Kim

National Radio Astronomy Observatory

H. J. Borish

University of Virginia

John Conway

Chalmers, Space, Earth and Environment, Onsala Space Observatory

E. J. Murphy

California Institute of Technology (Caltech)

National Radio Astronomy Observatory

Y. Song

University of Virginia

S. Stierwalt

California Institute of Technology (Caltech)

J. Surace

California Institute of Technology (Caltech)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 628 A71

Subject Categories

Analytical Chemistry

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics



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