Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111388
Title: The Warm-Up Phase in Massive Star-Forming Cores Around RCW 120
Authors: Kirsanova, M. S.
Salii, S. V.
Kalenskii, S. V.
Wiebe, D. S.
Sobolev, A. M.
Boley, P. A.
Issue Date: 2021
Publisher: Oxford University Press
Oxford University Press (OUP)
Citation: The Warm-Up Phase in Massive Star-Forming Cores Around RCW 120 / M. S. Kirsanova, S. V. Salii, S. V. Kalenskii et al. — DOI 10.18485/MS_ZMSS.2021.99.10 // Monthly Notices of the Royal Astronomical Society. — 2021. — Vol. 503. — Iss. 1. — P. 633-642.
Abstract: We study molecular emission in a massive condensation at the border of the H ii region RCW 120, paying particular attention to the Core 1 and 2 objects, the most massive fragments of the condensation found previously by ALMA. The latter fragment was previously suggested to host a high-mass analogue of Class 0 young stellar object. We present spectra of molecular emission in the 1 mm range made with the APEX telescope. We detect CH3OH and C34S lines in Cores 1 and 2. The CH3CN series and the SO2 lines are only found in Core 2. We estimate gas physical parameters using methanol lines and obtain gas temperature less than 100 K in both regions. Molecular hydrogen number density in Core 2 is in the range of 105-107 cm-3 and is more uncertain in Core 1. However, the detection of the CH3CN lines corresponding to highly excited transitions (Eu > 400 K) in Core 2 indicates that the region contains hot gas, while the abundances of CH3OH, CS, SO2, and CH3CN are quite low for a hot core stage. We propose that Core 2 is in the warm-up phase prior to the establishing of the hot gas chemistry. We suggest that Core 2 is in the beginning of the hot core stage. There are no detected CH3CN lines in Core 1; therefore, it might be on an even less evolved evolutionary stage. © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Keywords: ISM: CLOUDS
ISM: H II REGIONS
ISM: MOLECULES
STARS: FORMATION
URI: http://hdl.handle.net/10995/111388
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85105349075
PURE ID: 21869482
ISSN: 0035-8711
DOI: 10.18485/MS_ZMSS.2021.99.10
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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