Spectral Survey of the Star Formation Region DR21OH in the 4 mm Wavelength Range

S. V. Kalenskii; E. A. Mikheeva

doi:10.1134/S106377292312003X

paper

Spectral Survey of the Star Formation Region DR21OH in the 4 mm Wavelength Range

arXiv:2310.03858 · doi:10.1134/S106377292312003X

Abstract

The results of a spectral survey of the region of massive star formation DR21OH in the 4-mm wavelength range are presented. Sixty-nine molecules and their isotopologues have been detected, ranging from simple diatomic or triatomic species such as SO, SiO and CCH, to complex organic molecules such as CH $_{3}$ OCHO or CH $_{3}$ OCH $_{3}$ . The obtained results qualitatively repeat the results of the survey of the same source at 3~mm. The inventories of molecules found at 3mm and 4mm overlap to a great extent. However, at 4 mm we found a number of species that have no allowed transitions in the 3-mm wavelength range, e.g. DCN, DNC, or SO $^{+}$ . The bulk of the molecules detected at 4~mm are those that are common for dense cores, e.g., HC $_{3}$ N or CH $_{3}$ CCH, but some of the detected species are typical for hot cores. The latter include complex organic molecules CH $_{3}$ OCHO, CH $_{3}$ CH $_{2}$ OH, CH $_{3}$ OCH $_{3}$ , etc. However, the detected emission of these molecules probably arises in a gas heated to 30 K only. Nine molecules, including complex species CH $_{3}$ C $_{3}$ N, CH $_{3}$ CH $_{2}$ CN, CH $_{3}$ COCH $_{3}$ , were found by spectral line stacking. This demonstrates the prospects of the method in the study of molecular clouds.

arXiv comment36 pages, 4 figures

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MOLLId: software for automatic identification of spectral molecular lines in the sub-millimeter and millimeter bands and its application to the spectra of protostars from the region RCW 120