Patel, A.L. orcid.org/0000-0001-5800-6710, Urquhart, J.S. orcid.org/0000-0002-1605-8050, Yang, A.Y. et al. (7 more authors) (2023) SCOTCH − search for clandestine optically thick compact H IIs. Monthly Notices of the Royal Astronomical Society, 524 (3). pp. 4384-4402. ISSN 0035-8711
Abstract
This study uses archival high-frequency continuum data to expand the search for Hypercompact H II regions and determine the conditions at which they appear, as this stage high mass star formation is short-lived and rare. We use 23 GHz continuum data taken towards methanol masers, which are an excellent signpost for very young embedded high-mass protostars. We have searched for high-frequency, optically thick radio sources to identify HC H II region candidates. The data cover 128 fields that include 141 methanol masers identified by the Methanol Multibeam (MMB) survey. We have detected 68 high-frequency radio sources and conducted a multiwavelength analysis to determine their nature. This has identified 49 H II regions, 47 of which are embedded in dense clumps fourteen of which do not have a 5 GHz radio counterpart. We have identified 13 methanol maser sites that are coincident with radio sources that have a steep positive spectral index. The majority of these are not detected in the mid-infrared and have been classified as protostellar or young stellar objects in the literature and we therefore consider to be good HC H II region candidates, however, further work and higher resolution data are needed to confirm these candidates.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Author(s). This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | stars: evolution; stars: formation; Hii regions; radio continuum: stars |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) |
Funding Information: | Funder Grant number STFC (Science and Technology Facilities Council) ST/W00125X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Dec 2023 13:58 |
Last Modified: | 12 Dec 2023 13:58 |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/mnras/stad2143 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:206479 |