dc.contributor.advisor |
Mitchell, George Ferguson, 1941- |
|
dc.coverage.spatial |
Outer space |
|
dc.creator |
Watanabe, Tomomi, 1982- |
|
dc.date.accessioned |
2011-05-09T12:32:29Z |
|
dc.date.available |
2011-05-09T12:32:29Z |
|
dc.date.issued |
2007 |
|
dc.identifier.other |
QB791.4 W38 2007 |
|
dc.identifier.uri |
http://library2.smu.ca/xmlui/handle/01/22650 |
|
dc.description |
ix, 81 leaves : ill. (chiefly col.) ; 29 cm. |
|
dc.description |
Includes abstract. |
|
dc.description |
Includes bibliographical references (leaves 75-81). |
|
dc.description.abstract |
NGC 2024 is a star-forming region in Orion B which contains a dense molecular ridge and a number of dense cores seen by their dust emission (Mezger et al., 1992). This area is investigated using observations of four formaldehyde transitions, and the J = 3 - 2 transition of HCO<sup>+</sup> and H<sup>13</sup>CO<sup>+</sup>. Maps of the ridge are produced and used to provide temperatures and densities, with a focus on the dense core positions. The resulting temperatures are very warm (45-85 K), and derived H<sub>2</sub>CO number densities are found to be ~ 2×10<sup>6</sup> cm<sup>-3</sup>. Using the derived properties in combination with sub-mm data from Johnstone et al. (2006), core masses of ~2 M<sub>⊙</sub> are found within a 15" beamsize, and H<sub>2</sub>CO fractional abundances are calculated to resemble previous values found in similar star-forming regions. HCO<sup>+</sup> and H<sup>13</sup>CO<sup>+</sup> observations are used to obtain temperatures and also optical depths. The virial theorem is applied to FIR cores 3, 4, 5 and 6 suggests that all four cores are unstable against gravitational collapse. |
|
dc.description.provenance |
Made available in DSpace on 2011-05-09T12:32:29Z (GMT). No. of bitstreams: 0 |
en |
dc.language.iso |
en |
|
dc.publisher |
Halifax, N.S. : Saint Mary's University |
|
dc.subject.lcc |
QB791.4 |
|
dc.subject.lcsh |
Molecular clouds |
|
dc.subject.lcsh |
Nebulae |
|
dc.subject.lcsh |
Orion (Constellation) |
|
dc.title |
The dense molecular ridge in NGC 2024 |
|
dc.type |
Text |
|
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.) |
|