A Multi-Wavelength Study of Luminous Infrared Galaxies across Cosmic Time.

dc.contributor.author Chu, Jason K.
dc.contributor.department Astronomy
dc.date.accessioned 2019-05-28T19:31:21Z
dc.date.available 2019-05-28T19:31:21Z
dc.date.issued 2017-12
dc.identifier.uri http://hdl.handle.net/10125/62167
dc.title A Multi-Wavelength Study of Luminous Infrared Galaxies across Cosmic Time.
dc.type Thesis
dcterms.abstract Luminous infrared galaxies (LIRGs) are galaxies in which their infrared emission dominates their bolometric luminosities, and are considered some of the most extreme objects in the universe with their elevated star formation rates and/or presence of a powerful active galactic nucleus (AGN). In the local universe many of these objects are found to be in systems of gravitationally interacting or merging galaxies. In this work I present a statistically complete far-infrared and submillimeter census of local LIRGs in the Great Observatories All-Sky LIRG Survey (GOALS) sample using the Herschel Space Observatory. The resulting image atlas shows each of the 201 GOALS systems at six di erent wavelengths between 70{500 m, and is optimized to reveal both high and low surface brightness structures. In addition ux densities of companion galaxies in merging systems are measured where possible, as well as the total ux for each system. Using these results in conjunction with data from other infrared space missions, I construct the rst complete view of the near-infrared to submillimeter spectral energy distributions (SEDs) of LIRGs. I compare the properties of the SEDs with respect to their total infrared luminosity, submillimeter luminosity and spectral index, infrared color, and to previous SED models from the literature. Furthermore I investigate the radio-infrared correlation on a subset of the GOALS sample using infrared maps at 24, 70, and 100 m, and radio maps at 20 cm for the nucleus and entire galaxy. I nd a de cit in the nuclear 24 m ux due to silicate absorption for the majority of objects above 1011:6L , which suggests the presence of powerful AGN not seen at lower infrared luminosities. Finally, to understand the role of LIRGs in the early universe when the star formation rate was much higher, I study the properties of their vi rest-frame optical emission lines in the context of other star-forming and AGN galaxies at redshift z 2:3. I nd the vast majority of high redshift LIRGs displaying both starforming and AGN-like properties, which suggests that they are powered by both intense star formation as well as powerful AGN similar to their low redshift cousins.
dcterms.description Ph.D. Thesis. University of Hawaiʻi at Mānoa 2017.
dcterms.language eng
dcterms.publisher University of Hawaiʻi at Mānoa
dcterms.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
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