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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2412.20364 |
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| _version_ | 1866913628855205888 |
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| author | Jadhav, O. R. Dewangan, L. K. Verma, Aayushi Bhadari, N. K. Maity, A. K. Sharma, Saurabh Mamta |
| author_facet | Jadhav, O. R. Dewangan, L. K. Verma, Aayushi Bhadari, N. K. Maity, A. K. Sharma, Saurabh Mamta |
| contents | We present an observational study of the S284-RE region, a low-metallicity area associated with the extended S284 HII region. A thermally supercritical filament (mass $\sim$2402 $M_{\odot}$, length $\sim$8.5 pc) is investigated using the Herschel column density map. The Spitzer ratio 4.5 $μ$m/3.6 $μ$m map traces the H$_{2}$ outflows in this filament, where previously reported young stellar objects (YSOs) are spatially distributed. Analysis of the YSO distribution has revealed three active star-forming clusters (YCl1, YCl2, YCl3) within the filament. YCl3 seems to be the most evolved, YCl2 the youngest, while YCl1 displays signs of non-thermal fragmentation. The JWST (F470N+F444W)/F356W ratio map reveals at least seven bipolar H$_{2}$ outflows, with four (olc1--olc4) in YCl1 and three (ol1--ol3) in YCl2. The driving sources of these outflows are identified based on outflow geometry, ALMA continuum peaks, and YSO positions. Two ALMA continuum sources, #2 and #3, from the $M$-$R_{\rm eff}$ plot are recognized as potential massive star formation candidates. The ALMA continuum source #2 hosts at least three outflow-driving sources, whereas the ALMA continuum source #3 contains two. The bipolar outflow olc1, driven by an embedded object within the continuum source #2, is likely a massive protostar, as indicated by Br-$α$ and PAH emissions depicted in the JWST (F405N+F444W)/F356W ratio map. The presence of H$_{2}$ knots in the outflows olc1 and ol1 suggests episodic accretion. Overall, the study investigates a massive protostar candidate, driving the $\sim$2.7 pc H$_{2}$ outflow olc1 and undergoing episodic accretion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_20364 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Uncovering the hidden physical structures and protostellar activities in the Low-Metallicity S284-RE region: results from ALMA and JWST Jadhav, O. R. Dewangan, L. K. Verma, Aayushi Bhadari, N. K. Maity, A. K. Sharma, Saurabh Mamta Astrophysics of Galaxies We present an observational study of the S284-RE region, a low-metallicity area associated with the extended S284 HII region. A thermally supercritical filament (mass $\sim$2402 $M_{\odot}$, length $\sim$8.5 pc) is investigated using the Herschel column density map. The Spitzer ratio 4.5 $μ$m/3.6 $μ$m map traces the H$_{2}$ outflows in this filament, where previously reported young stellar objects (YSOs) are spatially distributed. Analysis of the YSO distribution has revealed three active star-forming clusters (YCl1, YCl2, YCl3) within the filament. YCl3 seems to be the most evolved, YCl2 the youngest, while YCl1 displays signs of non-thermal fragmentation. The JWST (F470N+F444W)/F356W ratio map reveals at least seven bipolar H$_{2}$ outflows, with four (olc1--olc4) in YCl1 and three (ol1--ol3) in YCl2. The driving sources of these outflows are identified based on outflow geometry, ALMA continuum peaks, and YSO positions. Two ALMA continuum sources, #2 and #3, from the $M$-$R_{\rm eff}$ plot are recognized as potential massive star formation candidates. The ALMA continuum source #2 hosts at least three outflow-driving sources, whereas the ALMA continuum source #3 contains two. The bipolar outflow olc1, driven by an embedded object within the continuum source #2, is likely a massive protostar, as indicated by Br-$α$ and PAH emissions depicted in the JWST (F405N+F444W)/F356W ratio map. The presence of H$_{2}$ knots in the outflows olc1 and ol1 suggests episodic accretion. Overall, the study investigates a massive protostar candidate, driving the $\sim$2.7 pc H$_{2}$ outflow olc1 and undergoing episodic accretion. |
| title | Uncovering the hidden physical structures and protostellar activities in the Low-Metallicity S284-RE region: results from ALMA and JWST |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.20364 |