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RAS PhysicsАстрономический журнал Astronomy Reports

  • ISSN (Print) 0004-6299
  • ISSN (Online) 3034-5170

STUDY OF THE PHYSICAL AND CHEMICAL PROPERTIES OF DENSE CLUMPS AT DIFFERENT EVOLUTIONARY STAGES IN SEVERAL REGIONS OF MASSIVE STAR AND STELLAR CLUSTER FORMATION

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PII
S30345170S0004629925040037-1
DOI
10.7868/S3034517025040037
Publication type
Article
Status
Published
Authors
A. G. Pazukhin
  • Affiliation:
    Federal Research Center A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences
    National Research Lobachevsky State University of Nizhny Novgorod
I. I. Zinchenko
  • Affiliation:
    Federal Research Center A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences
    National Research Lobachevsky State University of Nizhny Novgorod
E. A. Trofimova
  • Affiliation: Federal Research Center A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences
Volume/ Edition
Volume 102 / Issue number 4
Pages
262-280
Abstract
Massive stars play an important role in the Universe. Unlike low-mass stars, the formation of these objects located at great distances is still unclear. It is expected to be governed by some combination of self-gravity, turbulence, and magnetic fields. Our aim is to study the chemical and physical conditions of dense clumps at different evolutionary stages. We performed observations towards 5 regions of massive star and stellar cluster formation (L1287, S187, S231, DR 21(OH), NGC 7538) with the IRAM-30m telescope. We covered the 2 and 3–4 mm wavelength bands and analysed the lines of HCN, HNC, HCO+, HC3N, HNCO, OCS, CS, SiO, SO2, and SO. Using astrodendro algorithm on the 850 μm dust emission data from the SCUBA Legacy catalogue, we determined the masses, H2 column densities, and sizes of the clumps. Furthermore, the kinetic temperatures, molecular abundances, and dynamical state were obtained. The Red Midcourse Space Experiment Source survey (RMS) was used to determine the clump types. A total of 20 clumps were identified. Three clumps were found to be associated with the H II regions, 10 with young stellar objects (YSOs), and 7 with submillimetre emission. The clumps have typical sizes of ∼ 0.2 pc and masses from 1 to 102
Keywords
звездообразование межзвездная среда молекулярные облака межзвездные молекулы астрохимия
Date of publication
10.12.2024
Year of publication
2024
Number of purchasers
0
Views
44

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