Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWST
We present an observational study of the S284-RE region, a low-metallicity area associated with the extended S284 H ii region. A thermally supercritical filament (mass ∼2402 M _⊙ and length ∼8.5 pc) is investigated using the Herschel column density map. The Spitzer ratio 4.5 μ m/3.6 μ m map traces t...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ada388 |
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| author | O. R. Jadhav L. K. Dewangan Aayushi Verma N. K. Bhadari A. K. Maity Saurabh Sharma Mamta |
| author_facet | O. R. Jadhav L. K. Dewangan Aayushi Verma N. K. Bhadari A. K. Maity Saurabh Sharma Mamta |
| author_sort | O. R. Jadhav |
| collection | DOAJ |
| description | We present an observational study of the S284-RE region, a low-metallicity area associated with the extended S284 H ii region. A thermally supercritical filament (mass ∼2402 M _⊙ and length ∼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, and YCl3) within the filament. YCl3 seems to be the most evolved and YCl2 the youngest, while YCl1 displays signs of nonthermal 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, Atacama Large Millimeter/submillimeter Array (ALMA) continuum peaks, and YSO positions. Two ALMA continuum sources—#2 and #3—from the M – R _eff plot are recognized as potential massive star formation candidates. ALMA continuum source #2 hosts at least three outflow-driving sources, whereas ALMA continuum source #3 contains two. The bipolar outflow olc1, driven by an embedded object within continuum source #2, is likely a massive protostar, as indicated by the 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 ∼2.7 pc H _2 outflow olc1 and undergoing episodic accretion. |
| format | Article |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-56daad187ef04cf98e63d68582220b8e2025-02-07T12:10:39ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980113310.3847/1538-4357/ada388Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWSTO. R. Jadhav0https://orcid.org/0009-0001-2896-1896L. K. Dewangan1https://orcid.org/0000-0001-6725-0483Aayushi Verma2https://orcid.org/0000-0002-6586-936XN. K. Bhadari3https://orcid.org/0000-0001-8812-8460A. K. Maity4https://orcid.org/0000-0002-7367-9355Saurabh Sharma5https://orcid.org/0000-0001-5731-3057Mamta6Astronomy & Astrophysics Division , Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India ; omkar@prl.res.in; Indian Institute of Technology Gandhinagar Palaj , Gandhinagar 382355, IndiaAstronomy & Astrophysics Division , Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India ; omkar@prl.res.inAryabhatta Research Institute of Observational Sciences , Manora Peak, Nainital 263002, India; M.J.P. Rohilkhand University , Bareilly, Uttar Pradesh-243006, IndiaAstronomy & Astrophysics Division , Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India ; omkar@prl.res.inAstronomy & Astrophysics Division , Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India ; omkar@prl.res.in; Indian Institute of Technology Gandhinagar Palaj , Gandhinagar 382355, IndiaAryabhatta Research Institute of Observational Sciences , Manora Peak, Nainital 263002, IndiaAryabhatta Research Institute of Observational Sciences , Manora Peak, Nainital 263002, IndiaWe present an observational study of the S284-RE region, a low-metallicity area associated with the extended S284 H ii region. A thermally supercritical filament (mass ∼2402 M _⊙ and length ∼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, and YCl3) within the filament. YCl3 seems to be the most evolved and YCl2 the youngest, while YCl1 displays signs of nonthermal 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, Atacama Large Millimeter/submillimeter Array (ALMA) continuum peaks, and YSO positions. Two ALMA continuum sources—#2 and #3—from the M – R _eff plot are recognized as potential massive star formation candidates. ALMA continuum source #2 hosts at least three outflow-driving sources, whereas ALMA continuum source #3 contains two. The bipolar outflow olc1, driven by an embedded object within continuum source #2, is likely a massive protostar, as indicated by the 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 ∼2.7 pc H _2 outflow olc1 and undergoing episodic accretion.https://doi.org/10.3847/1538-4357/ada388Interstellar dust extinctionH II regionsInterstellar mediumStar formationInterstellar filamentsYoung stellar objects |
| spellingShingle | O. R. Jadhav L. K. Dewangan Aayushi Verma N. K. Bhadari A. K. Maity Saurabh Sharma Mamta Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWST The Astrophysical Journal Interstellar dust extinction H II regions Interstellar medium Star formation Interstellar filaments Young stellar objects |
| title | Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWST |
| title_full | Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWST |
| title_fullStr | Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWST |
| title_full_unstemmed | Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWST |
| title_short | Uncovering the Hidden Physical Structures and Protostellar Activities in the Low-metallicity S284-RE Region: Results from ALMA and JWST |
| title_sort | uncovering the hidden physical structures and protostellar activities in the low metallicity s284 re region results from alma and jwst |
| topic | Interstellar dust extinction H II regions Interstellar medium Star formation Interstellar filaments Young stellar objects |
| url | https://doi.org/10.3847/1538-4357/ada388 |
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