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Patel, AL, Urquhart, JS, Yang, AY, Moore, TJT, Menten, KM, Thompson, MA, Hoare, MG, Irabor, T, Breen, SL and Smith, MD (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
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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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 04 Oct 2024 15:40 |
| Last Modified: | 04 Oct 2024 15:45 |
| DOI or ID number: | 10.1093/mnras/stad2143 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24406 |
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