Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey
Artikel i vetenskaplig tidskrift, 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.

radio lines: galaxies

galaxies: ISM

galaxies: starburst

galaxies: active

ISM: molecules

Författare

R. Herrero-Illana

ESO

Consejo Superior de Investigaciones Científicas (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

Universidad Diego Portales

M. A. Perez-Torres

Universidad de Zaragoza

Consejo Superior de Investigaciones Científicas (CSIC)

A. Alberdi

Consejo Superior de Investigaciones Científicas (CSIC)

K. Iwasawa

Universitat de Barcelona

L. Armus

California Institute of Technology (Caltech)

Susanne Aalto

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

J. Mazzarella

California Institute of Technology (Caltech)

J. Chu

Gemini Observatory North

D. B. Sanders

University of Hawaii

Atacama Large Millimeter-submillimeter Array (ALMA)

L. Barcos-Munoz

National Radio Astronomy Observatory

University of Virginia

V Charmandaris

Natl Observ Athens

S. T. Linden

University of Virginia

I Yoon

National Radio Astronomy Observatory

D. T. Frayer

Green Bank Observ

H. Inami

NOAA, 950 North Cherry Ave

D-C Kim

National Radio Astronomy Observatory

H. J. Borish

University of Virginia

John Conway

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

E. J. Murphy

National Radio Astronomy Observatory

California Institute of Technology (Caltech)

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

Ämneskategorier

Analytisk kemi

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

DOI

10.1051/0004-6361/201834088

Mer information

Senast uppdaterat

2020-09-25