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The initial conditions of clustered star formation: an observational study of dense gas in the Ophiuchus molecular cloud

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dc.contributor.author Friesen, Rachel Katherine
dc.date.accessioned 2010-05-26T18:45:22Z
dc.date.available 2010-05-26T18:45:22Z
dc.date.copyright 2009 en
dc.date.issued 2010-05-26T18:45:22Z
dc.identifier.uri http://hdl.handle.net/1828/2811
dc.description.abstract In this dissertation I present a detailed survey of molecular line emission (including NH3, C2S, HC5N, N2H+, N2D+ and H2D+) towards clustered star forming Cores in the nearby Ophiuchus molecular cloud, with the aim of characterizing the distribution and kinematics of the dense gas within a clustered star forming environment and compare these results with those found in more isolated star forming regions. I show that the dense Oph Cores present characteristics of both isolated and clustered star forming regions in several key parameters, including Core kinematics, temperatures and chemistry. At the higher gas densities where the N2H+ emission is excited, I show that the presence of an embedded protostar is correlated with increased gas motions. I additionally present evidence of N2H+ depletion from the gas phase, suggesting that in higher density, clustered environments N2H+ may not accurately trace the physical conditions of the densest core gas. I present the distribution of H2D+ and N2D+ across the Oph B Core, and show the distribution is not simple or easily explained by chemical models of evolving, isolated cores. Finally, I summarize the results of this dissertation, the questions it raises concerning the exploration of how stars form in clusters, and discuss how these questions may be answered through upcoming observational surveys and by new telescope facilities. en
dc.language English eng
dc.language.iso en en
dc.rights Available to the World Wide Web en
dc.subject Stars en
dc.subject Clusters en
dc.subject Clouds en
dc.subject.lcsh UVic Subject Index::Sciences and Engineering::Physics::Astronomy en
dc.title The initial conditions of clustered star formation: an observational study of dense gas in the Ophiuchus molecular cloud en
dc.type Thesis en
dc.contributor.supervisor Di Francesco, James
dc.contributor.supervisor Pritchet, Christopher J.
dc.degree.department Dept. of Physics and Astronomy en
dc.degree.level Doctor of Philosophy Ph.D. en


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