Properties of the molecular interstellar medium in the lenticular galaxy NGC 5866

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dc.contributor.advisor Welch, Gary A.
dc.creator LeBlanc, Andrew Glenn
dc.date.accessioned 2011-05-09T12:32:13Z
dc.date.available 2011-05-09T12:32:13Z
dc.date.issued 2001
dc.identifier.other QB790 L43 2001
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/22510
dc.description ix, 158 leaves : ill. (some col.) ; 28 cm.
dc.description Includes abstract and appendices.
dc.description Includes bibliographical references (leaves 151-155).
dc.description.abstract The IRAM 30m telescope has been used to observe the J = 1-0 transition of [superscript 12]CO at several positions along the central dust lane of NGC 5866. The data were used to determine the large-scale properties of the molecular interstellar medium. We find that the interstellar medium mass, M(H[subscript 2]) = 4.55 ± 0.43 × 10 [superscript 8] M[symbol for sun], is consistent with simple mass-return calculations from evolved stars (e.g. Faber & Gallagher, 1976). A computer model was employed to constrain the distribution and kinematics of the gas, by attempting to simulate the multi-position spectroscopy. The gas is found to be in a broken Gaussian ring-like distribution with several warmer areas mostly found on the red shifted side. Rotation velocities much higher than those reported for both the stars and the ionized gas are required to reproduce the observed CO line width. The star formation rate is [approximately equal to]0.05 M[symbol for sun]/yr from Hα data, about average for an S0 galaxy, suggests that NGC 5866 is in mass balance based on the calculated mass return rate. The origin of the gas is most likely internal. However, the rapid rotation of the gas, a M [subscript H2]/M[subscript HI] ≥ 3.5, and evidence for a higher star formation rate in the past suggest that the gas might have been perturbed by an outside influence.
dc.language.iso en
dc.publisher Halifax, N.S. : Saint Mary's University
dc.subject.lcc QB790
dc.subject.lcsh Interstellar matter
dc.subject.lcsh Galaxies
dc.subject.lcsh Molecular astrophysics
dc.subject.lcsh Molecular dynamics
dc.subject.lcsh Interstellar molecules
dc.title Properties of the molecular interstellar medium in the lenticular galaxy NGC 5866
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.)


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