Magnetic Fields Under Feedback: A Case Study of the Massive Star-Forming Hub G34.26+0.15
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arXiv
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| Format: | Preprint |
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2024
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| author | Khan, Zacariyya A. Pattle, Kate Graves, Sarah F. |
| author_facet | Khan, Zacariyya A. Pattle, Kate Graves, Sarah F. |
| contents | We present 850$μ$m polarized observations of the molecular cloud G34.26+0.15 taken using the POL-2 polarimeter mounted on the James Clerk Maxwell Telescope (JCMT). G34.26+0.15 is a hub-filament system with ongoing high-mass star-formation, containing multiple HII regions. We extend the Histogram of Relative Orientations technique with an alternative application that considers the alignment of the magnetic field to the filaments and a HII region boundary, denoted as the filament alignment factor ($ξ_{F}$) and the ellipse alignment factor ($ξ_{E}$) respectively. Using these metrics, we find that, although in general the magnetic field aligns parallel to the filamentary structure within the system in the north-west, the magnetic field structure of G34.26+0.15 has been radically reshaped by the expansion of an evolved HII region in the south-east, which itself may have triggered further high-mass star formation in the cloud. Thus, we suggest high-mass star formation is both occurring through mass accretion as per the hub-filament model from one side, and through compression of gas under stellar feedback from the other. We also use HARP observations of C$^{18}$O from the CHIMPS survey to estimate the magnetic field strength across the cloud, finding strengths of $\sim$0.5-1.4 mG. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_06178 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic Fields Under Feedback: A Case Study of the Massive Star-Forming Hub G34.26+0.15 Khan, Zacariyya A. Pattle, Kate Graves, Sarah F. Astrophysics of Galaxies We present 850$μ$m polarized observations of the molecular cloud G34.26+0.15 taken using the POL-2 polarimeter mounted on the James Clerk Maxwell Telescope (JCMT). G34.26+0.15 is a hub-filament system with ongoing high-mass star-formation, containing multiple HII regions. We extend the Histogram of Relative Orientations technique with an alternative application that considers the alignment of the magnetic field to the filaments and a HII region boundary, denoted as the filament alignment factor ($ξ_{F}$) and the ellipse alignment factor ($ξ_{E}$) respectively. Using these metrics, we find that, although in general the magnetic field aligns parallel to the filamentary structure within the system in the north-west, the magnetic field structure of G34.26+0.15 has been radically reshaped by the expansion of an evolved HII region in the south-east, which itself may have triggered further high-mass star formation in the cloud. Thus, we suggest high-mass star formation is both occurring through mass accretion as per the hub-filament model from one side, and through compression of gas under stellar feedback from the other. We also use HARP observations of C$^{18}$O from the CHIMPS survey to estimate the magnetic field strength across the cloud, finding strengths of $\sim$0.5-1.4 mG. |
| title | Magnetic Fields Under Feedback: A Case Study of the Massive Star-Forming Hub G34.26+0.15 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.06178 |