Anomalous scattering of pulsars towards the Gum Nebula
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917243187625984 |
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| author | Krishnakumar, M. A. Joshi, Bhal Chandra Manoharan, P. K. |
| author_facet | Krishnakumar, M. A. Joshi, Bhal Chandra Manoharan, P. K. |
| contents | We report wideband scatter-broadening estimates of 14 pulsars towards the Gum nebula region using the Band-3 of the upgraded GMRT. This work increases the measurements of frequency scaling index of scatter-broadening ($α$) across the nebula by more than 3 times. A strong correlation between the distance and the scattering strength is observed for pulsars behind the nebula. It is also observed that for distant pulsars ($> 2 kpc$), the effect of the Gum nebula in DM and scattering strength is not substantial. We also report a much flatter $α$ for the Vela pulsar and argue that its scattering is not caused by the Gum nebula, but the Vela supernova remnant. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_19388 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalous scattering of pulsars towards the Gum Nebula Krishnakumar, M. A. Joshi, Bhal Chandra Manoharan, P. K. High Energy Astrophysical Phenomena We report wideband scatter-broadening estimates of 14 pulsars towards the Gum nebula region using the Band-3 of the upgraded GMRT. This work increases the measurements of frequency scaling index of scatter-broadening ($α$) across the nebula by more than 3 times. A strong correlation between the distance and the scattering strength is observed for pulsars behind the nebula. It is also observed that for distant pulsars ($> 2 kpc$), the effect of the Gum nebula in DM and scattering strength is not substantial. We also report a much flatter $α$ for the Vela pulsar and argue that its scattering is not caused by the Gum nebula, but the Vela supernova remnant. |
| title | Anomalous scattering of pulsars towards the Gum Nebula |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2510.19388 |