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

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...

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Detalles Bibliográficos
Autores: 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.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/218391
Acceso en línea:https://hdl.handle.net/2445/218391
Access Level:acceso abierto
Palabra clave:Galàxies actives
Astrofísica
Galàxies
Active galaxies
Astrophysics
Galaxies
Descripción
Sumario: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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