Tackling radio polarization data of high energy pulsars
Abstract/Contents
- Abstract
- The focus of this thesis is on understanding the pulsar magnetosphere particularly with the exploitation of radio polarization. The rotating vector model (the standard pulsar polarization model) can be modified to estimate emission altitude. However, more realistic treatment of relativistic and sweep-back effects show that such augmentations break down relatively quickly. This break-down is quantified and fitting functions are provided that preserve accuracy to higher altitude. The rotating vector model has proven particularly poor for modeling energetic pulsars. We remedy this by including the effects of orthogonal mode jumps, multiple emission altitudes, open zone growth via y-point lowering, and interstellar scattering. A large number of discrepancies can be understood while retaining the geometric picture. The model is systematically applied to six Fermi-detected pulsars (PSR J0023+0923, PSR J1024−0719, PSR J1744−1134, PSR J1057−5226, PSR J1420−6048, and PSR J2124−3358). Several other examples of utilizing polarization modeling to understand pulsar geometry and emission characteristics are also presented. Finally, a bidirectional emission model is applied to the polarization data of PSR J1057−5226 and PSR J1705−1906. Overall, we push the limit of what can be learned from a geometrically based model and emphasize the importance of tying such models to data.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2015 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Craig, Helen Alta |
|---|---|
| Associated with | Stanford University, Department of Applied Physics. |
| Primary advisor | Bucksbaum, Philip H |
| Primary advisor | Romani, Roger W. (Roger William) |
| Thesis advisor | Bucksbaum, Philip H |
| Thesis advisor | Romani, Roger W. (Roger William) |
| Thesis advisor | Blandford, Roger D |
| Advisor | Blandford, Roger D |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Helen Alta Craig. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2015. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2015 by Helen Craig
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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