Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage
We present a new, detailed analysis of the morphologies and molecular gas fractions (MGFs) for a complete sample of 65 local luminous infrared galaxies from Great Observatories All-Sky Luminous Infrared Galaxies (LIRG) Survey using high resolution I-band images from The Hubble Space Telescope, the U...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0004637X_v825_n2_p_Larson |
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todo:paper_0004637X_v825_n2_p_Larson2023-10-03T14:02:41Z Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage Larson, K.L. Sanders, D.B. Barnes, J.E. Ishida, C.M. Evans, A.S. Mazzarella, J.M. Kim, D.-C. Privon, G.C. Mirabel, I.F. Flewelling, H.A. galaxies: evolution galaxies: interactions infrared: galaxies We present a new, detailed analysis of the morphologies and molecular gas fractions (MGFs) for a complete sample of 65 local luminous infrared galaxies from Great Observatories All-Sky Luminous Infrared Galaxies (LIRG) Survey using high resolution I-band images from The Hubble Space Telescope, the University of Hawaii 2.2 m Telescope and the Pan-STARRS1 Survey. Our classification scheme includes single undisturbed galaxies, minor mergers, and major mergers, with the latter divided into five distinct stages from pre-first pericenter passage to final nuclear coalescence. We find that major mergers of molecular gas-rich spirals clearly play a major role for all sources with L IR > 10 11.5 L ⊙ ; however, below this luminosity threshold, minor mergers and secular processes dominate. Additionally, galaxies do not reach L IR > 10 12.0 L ⊙ until late in the merger process when both disks are near final coalescence. The mean MGF (MGF = M H2 /(M ∗ +M H2 )) for non-interacting and early-stage major merger LIRGs is 18 ± 2%, which increases to 33 ± 3%, for intermediate stage major merger LIRGs, consistent with the hypothesis that, during the early-mid stages of major mergers, most of the initial large reservoir of atomic gas (HI) at large galactocentric radii is swept inward where it is converted into molecular gas (H 2 ). © 2016. The American Astronomical Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v825_n2_p_Larson |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
galaxies: evolution galaxies: interactions infrared: galaxies |
| spellingShingle |
galaxies: evolution galaxies: interactions infrared: galaxies Larson, K.L. Sanders, D.B. Barnes, J.E. Ishida, C.M. Evans, A.S. Mazzarella, J.M. Kim, D.-C. Privon, G.C. Mirabel, I.F. Flewelling, H.A. Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage |
| topic_facet |
galaxies: evolution galaxies: interactions infrared: galaxies |
| description |
We present a new, detailed analysis of the morphologies and molecular gas fractions (MGFs) for a complete sample of 65 local luminous infrared galaxies from Great Observatories All-Sky Luminous Infrared Galaxies (LIRG) Survey using high resolution I-band images from The Hubble Space Telescope, the University of Hawaii 2.2 m Telescope and the Pan-STARRS1 Survey. Our classification scheme includes single undisturbed galaxies, minor mergers, and major mergers, with the latter divided into five distinct stages from pre-first pericenter passage to final nuclear coalescence. We find that major mergers of molecular gas-rich spirals clearly play a major role for all sources with L IR > 10 11.5 L ⊙ ; however, below this luminosity threshold, minor mergers and secular processes dominate. Additionally, galaxies do not reach L IR > 10 12.0 L ⊙ until late in the merger process when both disks are near final coalescence. The mean MGF (MGF = M H2 /(M ∗ +M H2 )) for non-interacting and early-stage major merger LIRGs is 18 ± 2%, which increases to 33 ± 3%, for intermediate stage major merger LIRGs, consistent with the hypothesis that, during the early-mid stages of major mergers, most of the initial large reservoir of atomic gas (HI) at large galactocentric radii is swept inward where it is converted into molecular gas (H 2 ). © 2016. The American Astronomical Society. All rights reserved. |
| format |
JOUR |
| author |
Larson, K.L. Sanders, D.B. Barnes, J.E. Ishida, C.M. Evans, A.S. Mazzarella, J.M. Kim, D.-C. Privon, G.C. Mirabel, I.F. Flewelling, H.A. |
| author_facet |
Larson, K.L. Sanders, D.B. Barnes, J.E. Ishida, C.M. Evans, A.S. Mazzarella, J.M. Kim, D.-C. Privon, G.C. Mirabel, I.F. Flewelling, H.A. |
| author_sort |
Larson, K.L. |
| title |
Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage |
| title_short |
Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage |
| title_full |
Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage |
| title_fullStr |
Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage |
| title_full_unstemmed |
Morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage |
| title_sort |
morphology and molecular gas fractions of local luminous infrared galaxies as a function of infrared luminosity and merger stage |
| url |
http://hdl.handle.net/20.500.12110/paper_0004637X_v825_n2_p_Larson |
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