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877457.pdf (6.44 MB)

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2023

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/218391

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

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https://doi.org/10.1051/0004-6361/201834088

Resum

We present IRAM-30 m Telescope 12CO and 13CO 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 12CO, and 29 (52%) are also detected in 13CO above a 3σ level. The median full width at zero intensity (FWZI) velocity of the CO line emission is 661 km s−1 , and ∼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-H2 conversion factor of hαi = 1.8 +1.3 −0.8 M (K km s−1 pc2 ) −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 12CO/ 13CO ratio and dust temperature, confirming a transition to elevated ratios in warmer systems. 

Matèries

Galàxies actives, Astrofísica, Galàxies

Matèries (anglès)

Active galaxies, Astrophysics, Galaxies

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Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citació

HERRERO-ILLANA, R., et al. Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey?. Astronomy & Astrophysics. 2023. Vol. 628, num. A71. ISSN 0004-6361. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/218391

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