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Thesis
The galactic center radio arc: a multi-frequency polarimetric study
University of Iowa
Master of Science (MS), University of Iowa
Spring 2014
DOI: 10.17077/etd.p0vb26kx
Abstract
<p>Despite the Radio Arc non-thermal filaments (NTFs) being discovered 30 years ago, their origin remain poorly understood. The Radio Arc NTFs have an unusually flat spectrum in the centimeter to millimeter spectrum with a predicted, though poorly constrained, turn-over between 30-200 GHz. With the recently upgraded wide-band capabilities of the VLA, we conducted a multi-frequency polarimetric study of the Radio Arc region. With observations at a set of low radio frequencies (continuous coverage over 2-6 GHz & 10-12 GHz), we imaged both the total and polarized intensity distributions at high angular resolution (<1"). Presented here are the preliminary results from four observations spanning May 2013 to February 2014 using the DnC, CnB, B & BnA array configurations. This study has produced the deepest continuum intensity images of the Radio Arc region to date, with a sensitivity an order of magnitude greater than previous surveys, and resulted in the detection of new structure and compact emission sources. These observations will serve as a pilot polarization study for larger, more complete polarimetric surveys of the Galactic center region.</p>
Details
- Title: Subtitle
- The galactic center radio arc: a multi-frequency polarimetric study
- Creators
- James Toomey IV - University of Iowa
- Contributors
- Cornelia C. Lang (Advisor)Steven Spangler (Committee Member)Hai Fu (Committee Member)
- Resource Type
- Thesis
- Degree Awarded
- Master of Science (MS), University of Iowa
- Degree in
- Astronomy
- Date degree season
- Spring 2014
- Publisher
- University of Iowa
- DOI
- 10.17077/etd.p0vb26kx
- Number of pages
- ix, 67 pages
- Copyright
- Copyright © 2014 James Toomey
- Comment
This thesis has been optimized for improved web viewing. If you require the original version, contact the University Archives at the University of Iowa: https://www.lib.uiowa.edu/sc/contact/.
- Language
- English
- Description illustrations
- illustrations (some color)
- Description bibliographic
- Includes bibliographical references (pages 65-67).
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9983776809602771
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