dc.contributor.advisor |
Sawicki, Marcin, 1969- |
|
dc.creator |
Marquis, Andrew H. |
|
dc.date.accessioned |
2011-10-11T17:42:40Z |
|
dc.date.available |
2011-10-11T17:42:40Z |
|
dc.date.issued |
2010 |
|
dc.identifier.other |
QB857.5 E96 M278 2010 |
|
dc.identifier.uri |
http://library2.smu.ca/xmlui/handle/01/23732 |
|
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 (dianne.macphee@smu.ca) 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 |
thesis.degree.name |
Master of Science in Astronomy |
|
thesis.degree.level |
Masters |
|
thesis.degree.discipline |
Astronomy and Physics |
|
thesis.degree.grantor |
Saint Mary's University (Halifax, N.S.) |
|