Alexandria Digital Research Library

Probing Strongly-Scattered Compact Objects Using Ultra-High-Resolution Techniques in Radio Astronomy

Author:
Johnson, Michael Douglas
Degree Grantor:
University of California, Santa Barbara. Physics
Degree Supervisor:
Carl Gwinn
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2013
Issued Date:
2013
Topics:
Physics, Astronomy and Astrophysics, Physics, General, and Physics, Astrophysics
Keywords:
Radio Astronomy
Interstellar Medium
Scintillation
Pulsar
Vela Pulsar
Genres:
Dissertations, Academic and Online resources
Dissertation:
Ph.D.--University of California, Santa Barbara, 2013
Description:

This dissertation explores fundamental limits in radio astronomy and develops techniques that utilize the scintillation of compact objects to probe detailed properties of their emission regions and of the scattering material. I develop a statistical framework for observations with spectral resolution at or near the Nyquist limit, suitable for describing the observed statistics of strongly-scattered sources. I demonstrate that these statistics can effectively isolate the signature of an extended emission region, requiring no assumptions about the nature or distribution of the scattering material. Then, using observations of the Vela pulsar at 760 MHz with the Green Bank Telescope, I thereby achieve a spatial resolution of 4 km at the pulsar. Finally, I explore the signature of refractive scintillation on the interferometric visibility measured on long baselines, and I derive optimal correlation estimators for quantized data.

Physical Description:
1 online resource (233 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3qz27xq
ISBN:
9781303425905
Catalog System Number:
990040770550203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Michael Johnson
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