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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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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.
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HERRERO-ILLANA, R., PRIVON, G.c., EVANS, A.s., DÍAZ-SANTOS, T., PÉREZ-TORRES, M.á., UV, V., ALBERDI, A., IWASAWA, Kazushi, ARMUS, L., AALTO, S., MAZZARELLA, J., CHU, J., SANDERS, D.b., BARCOS-MUÑOZ, L., CHARMANDARIS, V., LINDEN, S.t., YOON, I., FRAYER, D.t., INAMI, H., KIM, D.-c., BORISH, H.j., CONWAY, J., MURPHY, E.j., SONG, Y., STIERWALT, S., SURACE, J.. Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey?. _Astronomy & Astrophysics_. 2023. Vol. 628, núm. A71. [consulta: 22 de gener de 2026]. ISSN: 0004-6361. [Disponible a: https://hdl.handle.net/2445/218391]