Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21930703r&link_type=abstract
American Astronomical Society, AAS Meeting #219, #307.03
Astronomy and Astrophysics
Astronomy
Scientific paper
This thesis explores the nature of star-forming galaxies and their evolution as seen in the mid-infrared (IR) wavelengths. We first study the star formation rate density evolution by constructing the IR luminosity functions (LF) at 0 < z < 1.2. Separately, we find that star-forming galaxies at both low and high redshifts fall into a nearly linear relationship between the infrared luminosity (LIR) and infrared luminosity surface density (LIRSD) over five orders of magnitude in luminosity, which indicates that high-redshift IR luminous star-forming galaxies have similar structures to local normal star-forming galaxies and primarily differ in the 100x to 1000x higher star formation rate (SFR) surface density. We show that the LIRSD, instead of the LIR, is a good indicator of the shape of star-forming galaxies' spectral energy distributions at both low and high redshifts. This result is used to develop a new technique to estimate the LIR, which results in an indicator that predicts LIR and SFR from a single-band 24 micron observation, consistent with a full spectral energy distribution within 0.1 dex. We use this indicator to construct the IR LF of star-forming galaxies and study SFR evolution at redshift 0 < z < 3, spanning 11 billion years of the cosmic history. In addition to exploring statistical properties of large samples of galaxies, this thesis also studies individual strongly gravitationally lensed star-forming galaxies at 1 < z < 3 using near-IR and mid-IR spectroscopy with the the Large Binocular Telescope and the Spitzer Space Telescope to understand their extinction, structure, and physical conditions.
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