High-resolution Radio Study of Pulsar Wind Nebula MSH 15-52 and Supernova Remnant RCW 89
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| Format: | Preprint |
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2025
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| author | Zhang, S. Ng, C. -Y. Bucciantini, N. |
| author_facet | Zhang, S. Ng, C. -Y. Bucciantini, N. |
| contents | We present high-resolution radio observations of the pulsar wind nebula (PWN) MSH15-52, which is renowned for its distinctive hand-like shape, and its associated supernova remnant RCW 89. Using the Australia Telescope Compact Array (ATCA), we obtained 3 and 6,cm radio maps with a resolution of 2 arcsec. These unveil small-scale radio features in the system and allow a direct comparison with the arcsecond-resolution X-ray images. We find that the radio emission is composed of a complex filamentary structure. In particular, there is a bar-like feature across the central pulsar B1509-58 in the inner PWN, and the radio sheath wrapping around the pulsar also appears to be made up of filaments. Some prominent X-ray features are not detected in radio, including the one-sided jet in the south and the finger-like structures in the north. These indicates turn over of the particle distribution at low energies in these regions. For RCW 89, the radio emission well coincides with both the X-ray knots and the Hα filaments. The high polarization fraction shows that the emission is synchrotron in nature, but it extends well beyond the sharp boundary of the non-thermal X-ray emission, which is difficult to explain. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_14476 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-resolution Radio Study of Pulsar Wind Nebula MSH 15-52 and Supernova Remnant RCW 89 Zhang, S. Ng, C. -Y. Bucciantini, N. High Energy Astrophysical Phenomena We present high-resolution radio observations of the pulsar wind nebula (PWN) MSH15-52, which is renowned for its distinctive hand-like shape, and its associated supernova remnant RCW 89. Using the Australia Telescope Compact Array (ATCA), we obtained 3 and 6,cm radio maps with a resolution of 2 arcsec. These unveil small-scale radio features in the system and allow a direct comparison with the arcsecond-resolution X-ray images. We find that the radio emission is composed of a complex filamentary structure. In particular, there is a bar-like feature across the central pulsar B1509-58 in the inner PWN, and the radio sheath wrapping around the pulsar also appears to be made up of filaments. Some prominent X-ray features are not detected in radio, including the one-sided jet in the south and the finger-like structures in the north. These indicates turn over of the particle distribution at low energies in these regions. For RCW 89, the radio emission well coincides with both the X-ray knots and the Hα filaments. The high polarization fraction shows that the emission is synchrotron in nature, but it extends well beyond the sharp boundary of the non-thermal X-ray emission, which is difficult to explain. |
| title | High-resolution Radio Study of Pulsar Wind Nebula MSH 15-52 and Supernova Remnant RCW 89 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2508.14476 |