The evolution of star formation rates in high-redshift galaxies

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dc.contributor.advisor Sawicki, Marcin, 1969-
dc.creator Marquis, Andrew H. 2011-10-11T17:42:40Z 2011-10-11T17:42:40Z 2010
dc.identifier.other QB857.5 E96 M278 2010
dc.description ii, 107 leaves : ill. ; 29 cm. en_CA
dc.description Includes abstract.
dc.description Includes bibliographical references (leaves 64-66).
dc.description.abstract We use photometric galaxy samples and spectral synthesis models to investigate the ability of three dramatically divergent star formation histories (SFHs) to describe the build-up of stellar mass in galaxy populations between z∼5 and z∼2. The SFHs in question assume constant, exponentially increasing, and exponentially decreasing star formation rates (SFRs). For each considered SFH, we use a broadband spectral energy distribution model-fitting technique to parameterize the galaxy samples according to photometric redshift, color excess, age, stellar mass, and SFR. Starting at z∼5, we then evolve the stellar mass and SFR of a toy galaxy across the epochs in question and quantify its agreement with the model-fit observations at z∼3 and z∼2. This is done for each assumed SFH. We find the exponentially increasing SFH with a 500 Myr e-folding agrees best with the model-fit observations, while the exponentially decreasing SFH shows the worst agreement. We further analyze the model-fit data for trends in color excess versus rest-frame UV magnitude and identify that, for z∼3 galaxies fit for constant star formation, UV-brighter objects are more highly obscured by dust than the UV-faint. This dependence is not identified in the other data sets. en_CA
dc.description.provenance Submitted by Dianne MacPhee ( on 2011-10-11T17:42:40Z No. of bitstreams: 0 en
dc.description.provenance Made available in DSpace on 2011-10-11T17:42:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2010 en
dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University en_CA
dc.subject.lcc QB857.5.E96
dc.subject.lcsh Galaxies -- Evolution
dc.subject.lcsh Stars -- Formation
dc.subject.lcsh Red shift
dc.title The evolution of star formation rates in high-redshift galaxies en_CA
dc.type Text en_CA Master of Science in Astronomy Masters Astronomy and Physics Saint Mary's University (Halifax, N.S.)
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