dc.contributor.advisor | Rudnick, Gregory H | |
dc.contributor.author | Lee-Brown, Donald | |
dc.date.accessioned | 2017-05-15T03:08:07Z | |
dc.date.available | 2017-05-15T03:08:07Z | |
dc.date.issued | 2016-12-31 | |
dc.date.submitted | 2016 | |
dc.identifier.other | http://dissertations.umi.com/ku:15003 | |
dc.identifier.uri | http://hdl.handle.net/1808/24174 | |
dc.description.abstract | Understanding how galaxies stop forming stars is a principle pursuit of extragalactic astrophysics. Here, I present a study of the relation between galaxy stellar age and mass in the $z=1.62$ protocluster IRC 0218. After separating star forming and quiescent galaxies on the basis of their $UVJ$ colors, we find that at stellar masses $M_* \ge 10^{10.8} M_{\odot}$, the quiescent fraction in IRC 0218 is $f_Q=1.0^{+0.00}_{-0.36}$, approximately $2-3 \times$ higher than the field value. At lower masses, $f_Q$ is consistent with the field. Using galaxy $D_{n}(4000)$ values as measures of stellar age, we find no relation between age and mass. This may indicate that the mass dependence of $f_Q$ was imprinted early in IRC 0218's history. Alternatively, the lack of a relation may be due to mass redistribution through gasless merging. Ultimately, our results place constraints on the mechanism(s) responsible for quenching in dense environments at $z\ge 1.5$. | |
dc.format.extent | 49 pages | |
dc.language.iso | en | |
dc.publisher | University of Kansas | |
dc.rights | Copyright held by the author. | |
dc.subject | Astronomy | |
dc.subject | Astrophysics | |
dc.subject | Galaxies | |
dc.subject | Galaxy Clusters | |
dc.subject | Galaxy Evolution | |
dc.title | The Ages of Passive Galaxies in a z=1.62 Protocluster | |
dc.type | Thesis | |
dc.contributor.cmtemember | Anthony-Twarog, Barbara J | |
dc.contributor.cmtemember | Hawley, Steven A | |
dc.thesis.degreeDiscipline | Physics & Astronomy | |
dc.thesis.degreeLevel | M.S. | |
dc.identifier.orcid | | |
dc.rights.accessrights | openAccess | |