Absolute polarisation position angle profiles of southern pulsars at 1.4 and 3.1 GHz
We present here a direct comparison of the polarisation position angle (PA) profiles of 17 pulsars, observed at 1.4 and 3.1 GHz. Absolute PAs are obtained at each frequency, permitting a measurement of the difference in the profiles. By doing this, we obtain more precise rotation measure (RM) values...
| Main Authors: | , |
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| Format: | Journal article |
| Published: |
2005
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| _version_ | 1797095480913559552 |
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| author | Karastergiou, A Johnston, S |
| author_facet | Karastergiou, A Johnston, S |
| author_sort | Karastergiou, A |
| collection | OXFORD |
| description | We present here a direct comparison of the polarisation position angle (PA) profiles of 17 pulsars, observed at 1.4 and 3.1 GHz. Absolute PAs are obtained at each frequency, permitting a measurement of the difference in the profiles. By doing this, we obtain more precise rotation measure (RM) values for some of the pulsars in the current catalogue. We find that, apart from RM corrections, there are small, pulse longitude dependent differences in PA with frequency. Such differences go beyond the interpretation of a geometrical origin. We describe in detail the PA evolution between the two frequencies and discuss possible causes, such as orthogonal and non-orthogonal polarisation modes of emission. We also use the PA and total power profiles to estimate the difference in emission height at which the two frequencies originate. In our data sample, there are changes in the relative strengths of different pulse components, especially overlapping linearly polarised components, which coincide with intrinsic changes of the PA profile, resulting in interesting PA differences between the two frequencies. |
| first_indexed | 2024-03-07T04:28:25Z |
| format | Journal article |
| id | oxford-uuid:cd760ca2-a977-4bc2-be2f-405bc7be7fca |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:28:25Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:cd760ca2-a977-4bc2-be2f-405bc7be7fca2022-03-27T07:28:52ZAbsolute polarisation position angle profiles of southern pulsars at 1.4 and 3.1 GHzJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:cd760ca2-a977-4bc2-be2f-405bc7be7fcaSymplectic Elements at Oxford2005Karastergiou, AJohnston, SWe present here a direct comparison of the polarisation position angle (PA) profiles of 17 pulsars, observed at 1.4 and 3.1 GHz. Absolute PAs are obtained at each frequency, permitting a measurement of the difference in the profiles. By doing this, we obtain more precise rotation measure (RM) values for some of the pulsars in the current catalogue. We find that, apart from RM corrections, there are small, pulse longitude dependent differences in PA with frequency. Such differences go beyond the interpretation of a geometrical origin. We describe in detail the PA evolution between the two frequencies and discuss possible causes, such as orthogonal and non-orthogonal polarisation modes of emission. We also use the PA and total power profiles to estimate the difference in emission height at which the two frequencies originate. In our data sample, there are changes in the relative strengths of different pulse components, especially overlapping linearly polarised components, which coincide with intrinsic changes of the PA profile, resulting in interesting PA differences between the two frequencies. |
| spellingShingle | Karastergiou, A Johnston, S Absolute polarisation position angle profiles of southern pulsars at 1.4 and 3.1 GHz |
| title | Absolute polarisation position angle profiles of southern pulsars at
1.4 and 3.1 GHz |
| title_full | Absolute polarisation position angle profiles of southern pulsars at
1.4 and 3.1 GHz |
| title_fullStr | Absolute polarisation position angle profiles of southern pulsars at
1.4 and 3.1 GHz |
| title_full_unstemmed | Absolute polarisation position angle profiles of southern pulsars at
1.4 and 3.1 GHz |
| title_short | Absolute polarisation position angle profiles of southern pulsars at
1.4 and 3.1 GHz |
| title_sort | absolute polarisation position angle profiles of southern pulsars at 1 4 and 3 1 ghz |
| work_keys_str_mv | AT karastergioua absolutepolarisationpositionangleprofilesofsouthernpulsarsat14and31ghz AT johnstons absolutepolarisationpositionangleprofilesofsouthernpulsarsat14and31ghz |