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    Alma Spectroscopic Observations Of The 13co/C18o Intensity Ratios In NGC602 And N22 Of The Small Magellanic Cloud

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    Author
    Carlson, Ryan Michael
    Issue Date
    2019
    Advisor
    Bieging, John
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    This research sought to observe C18O in the Small Magellanic Cloud (SMC) in regions NGC602 and N22 using data taken by the Atacama Large Millimeter/ Submillimeter Array (ALMA). C18O has been used as a dense gas tracer and has been observed in both the Milky Way (MW) and the Large Magellanic Cloud (LMC). There was no direct detection of C18O (J: 2 ! 1 line emission in either NGC602 or N22 based on the integrated intensity images. A lower bound of the 13CO/C18O integrated intensity ratio is calculated to be  60 for NGC602 and  58 for N22 is set based on spectral line stacking analysis. These integrated intensity ratios are about twice as large as LMC values and 20 times larger MW ratios. The large integrated intensity ratio indicates that emission of C18O is lower than what would be expected from metallicity scaling of Milky Way and LMC observations, which may be a consequence of a low abundance of the isotope 18O because of reduced massive star nucleosynthesis in comparison to the MW and LMC.
    Type
    text
    Electronic Thesis
    Degree Name
    B.S.
    Degree Program
    Honors College
    Astronomy
    Degree Grantor
    University of Arizona
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    Honors Theses

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