H II regions and high-mass starless clump candidates: II. Fragmentation and induced star formation at similar to 0.025 pc scale: an ALMA continuum study
Author
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Zhang, S.
Author
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Zavagno, A.
Author
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López Sepulcre, A.
Author
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Liu, H.
Author
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Louvet, Fabien
Author
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Figueira, M.
Author
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Russeil, D.
Author
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Wu, Y.
Author
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Yuan, J.
Author
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Pillai, T. G. S
Admission date
dc.date.accessioned
2022-01-17T18:23:53Z
Available date
dc.date.available
2022-01-17T18:23:53Z
Publication date
dc.date.issued
2021
Cita de ítem
dc.identifier.citation
A&A 646, A25 (2021)
es_ES
Identifier
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10.1051/0004-6361/202038421
Identifier
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https://repositorio.uchile.cl/handle/2250/183731
Abstract
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Context. The ionization feedback from H II regions modifies the properties of high-mass starless clumps (HMSCs, of several hundred to a few thousand solar masses with a typical size of 0.1–1 pc), such as dust temperature and turbulence, on the clump scale. The question of whether the presence of H II regions modifies the core-scale ( 0:025 pc) fragmentation and star formation in HMSCs remains to be explored. Aims. We aim to investigate the difference of 0.025 pc-scale fragmentation between candidate HMSCs that are strongly impacted by H II regions and less disturbed ones.We also search for evidence of mass shaping and induced star formation in the impacted candidate HMSCs. Methods. Using the ALMA 1.3 mm continuum, with a typical angular resolution of 1.300, we imaged eight candidate HMSCs, including four impacted by H II regions and another four situated in the quiet environment. The less-impacted candidate HMSCs are selected on the basis of their similar mass and distance compared to the impacted ones to avoid any possible bias linked to these parameters. We carried out a comparison between the two types of candidate HMSCs. We used multi-wavelength data to analyze the interaction between H II regions and the impacted candidate HMSCs. Results. A total of 51 cores were detected in eight clumps, with three to nine cores for each clump. Within our limited sample, we did not find a clear difference in the 0:025 pc-scale fragmentation between impacted and non-impacted candidate HMSCs, even though H II regions seem to affect the spatial distribution of the fragmented cores. Both types of candidate HMSCs present a thermal fragmentation with two-level hierarchical features at the clump thermal Jeans length th J;clump and 0.3 th J;clump. The ALMA emission morphology of the impacted candidate HMSCs AGAL010.214-00.306 and AGAL018.931-00.029 sheds light on the capacities of H II regions to shape gas and dust in their surroundings and possibly to trigger star formation at 0:025 pc-scale in candidate HMSCs. Conclusions. The fragmentation at 0:025 pc scale for both types of candidate HMSCs is likely to be thermal-dominant, meanwhile H II regions probably have the capacity to assist in the formation of dense structures in the impacted candidate HMSCs. Future ALMA imaging surveys covering a large number of impacted candidate HMSCs with high turbulence levels are needed to confirm the trend of fragmentation indicated in this study.
es_ES
Patrocinador
dc.description.sponsorship
Institut Universitaire de France
National Science Foundation (NSF) AST-2009842
Agenzia Spaziale Italiana (ASI) I/038/080/0
I/029/12/0
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Lenguage
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en
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Publisher
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EDP Sciences
es_ES
Type of license
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 United States
H II regions and high-mass starless clump candidates: II. Fragmentation and induced star formation at similar to 0.025 pc scale: an ALMA continuum study