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

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Title:A Multi-Wavelength Study of Luminous Infrared Galaxies across Cosmic Time.
Authors:Chu, Jason K.
Contributors:Astronomy (department)
Date Issued:Dec 2017
Publisher:University of Hawaiʻi at Mānoa
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.
Description:Ph.D. Thesis. University of Hawaiʻi at Mānoa 2017.
URI:http://hdl.handle.net/10125/62167
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.
Appears in Collections: Ph.D. - Astronomy


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