High Resolution VLA Radio Observations of the Boomerang Pulsar Wind Nebula
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866917290354671616 |
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| author | Lai, Paul C. W. Ng, Chi-Yung Zhang, Shumeng |
| author_facet | Lai, Paul C. W. Ng, Chi-Yung Zhang, Shumeng |
| contents | We present a radio polarimetric study of the Boomerang pulsar wind nebula G106.65+2.96 with VLA observations at the 6 GHz band. Our high-resolution image discovers new small-scale features in the nebula, including an elliptical core of $40''\times20''$ surrounding the central pulsar and a $2'$-long arc wrapping around the core in the north. The latter shows a clear gap from the core, and it consists of a bright lobe in the northwest and a tongue-like structure in the northeast. These could be resulting from the pulsar wind interaction with the environment. Our polarization measurement reveals a highly ordered magnetic field with toroidal geometry. The small scale features are all highly linearly polarized. In particular, the lobe has a polarization fraction of $\sim$60%, close to the synchrotron limit. This is also much higher than the value measured at a lower frequency, implying significant depolarization. We show that this can be explained by Faraday rotation in the nebula, and we constructed a simple 3D model accordingly to infer a magnetic field strength of $\sim$50-105$μ$G. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_20230 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High Resolution VLA Radio Observations of the Boomerang Pulsar Wind Nebula Lai, Paul C. W. Ng, Chi-Yung Zhang, Shumeng High Energy Astrophysical Phenomena We present a radio polarimetric study of the Boomerang pulsar wind nebula G106.65+2.96 with VLA observations at the 6 GHz band. Our high-resolution image discovers new small-scale features in the nebula, including an elliptical core of $40''\times20''$ surrounding the central pulsar and a $2'$-long arc wrapping around the core in the north. The latter shows a clear gap from the core, and it consists of a bright lobe in the northwest and a tongue-like structure in the northeast. These could be resulting from the pulsar wind interaction with the environment. Our polarization measurement reveals a highly ordered magnetic field with toroidal geometry. The small scale features are all highly linearly polarized. In particular, the lobe has a polarization fraction of $\sim$60%, close to the synchrotron limit. This is also much higher than the value measured at a lower frequency, implying significant depolarization. We show that this can be explained by Faraday rotation in the nebula, and we constructed a simple 3D model accordingly to infer a magnetic field strength of $\sim$50-105$μ$G. |
| title | High Resolution VLA Radio Observations of the Boomerang Pulsar Wind Nebula |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2602.20230 |