Determining the Magnetic Field in the Galactic Plane from New Arecibo Pulsar Faraday Rotation Measurements
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929535695454208 |
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| author | Curtin, Alice P. Weisberg, Joel M. Rankin, Joanna M. |
| author_facet | Curtin, Alice P. Weisberg, Joel M. Rankin, Joanna M. |
| contents | We develop a new method for studying the Galactic magnetic field along the spiral arms using pulsar Faraday rotation measures (RMs). Our new technique accounts for the dot-product nature of Faraday rotation and also splits the associated path integral into segments corresponding to particular zones along the LOS. We apply this geometrically-corrected, arm-by-arm technique to the low-latitude portion of a recently published set of Arecibo Faraday RMs for 313 pulsars along with previously obtained RMs in the same regions. We find disparities $>1σ$ between the magnitude of the field above and below the plane in the Local Arm, Sagittarius Arm, Sagittarius-to-Scutum Interarm, the Scutum Arm, and Perseus Arm. We find evidence for a single field reversal near the Local/Sagittarius arm boundary. Interestingly, our results suggest that this field reversal is dependent on latitude, occurring inside the Sagittarius arm at negative Galactic latitudes and at the Local-to-Sagittarius Arm boundary at positive Galactic latitudes. We discuss all of our results in the context of different models and other observational Galactic magnetic field analyses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_07967 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Determining the Magnetic Field in the Galactic Plane from New Arecibo Pulsar Faraday Rotation Measurements Curtin, Alice P. Weisberg, Joel M. Rankin, Joanna M. Astrophysics of Galaxies We develop a new method for studying the Galactic magnetic field along the spiral arms using pulsar Faraday rotation measures (RMs). Our new technique accounts for the dot-product nature of Faraday rotation and also splits the associated path integral into segments corresponding to particular zones along the LOS. We apply this geometrically-corrected, arm-by-arm technique to the low-latitude portion of a recently published set of Arecibo Faraday RMs for 313 pulsars along with previously obtained RMs in the same regions. We find disparities $>1σ$ between the magnitude of the field above and below the plane in the Local Arm, Sagittarius Arm, Sagittarius-to-Scutum Interarm, the Scutum Arm, and Perseus Arm. We find evidence for a single field reversal near the Local/Sagittarius arm boundary. Interestingly, our results suggest that this field reversal is dependent on latitude, occurring inside the Sagittarius arm at negative Galactic latitudes and at the Local-to-Sagittarius Arm boundary at positive Galactic latitudes. We discuss all of our results in the context of different models and other observational Galactic magnetic field analyses. |
| title | Determining the Magnetic Field in the Galactic Plane from New Arecibo Pulsar Faraday Rotation Measurements |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.07967 |