Highly deuterated pre-stellar cores in a high-mass star formation region

Abstract

We have observed the deuterated gas in the high-mass star formation region IRAS 05345+3157 at high-angular resolution, in order to determine the morphology and the nature of such gas. We have mapped the N2H+ (1-0) line with the Plateau de Bure Interferometer, and the N2D+ (3-2) and N2H+ (3-2) lines with the Submillimeter Array. The N2D+ (3-2) integrated emission is concentrated in two condensations, with masses of 2-3 and 9 M_sun and diameters of 0.05 and 0.09 pc, respectively. The high deuterium fractionation (0.1) and the line parameters in the N2D+ condensations indicate that they are likely low- to intermediate-mass pre-stellar cores, even though other scenarios are possible.

arXiv comment4 pages, 2 figures, accepted for publication in Astronomy and Astrophysics

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• The NH2D/NH3 ratio toward pre-protostellar cores around the UCHII region in IRAS 20293+3952
• Deuterium fractionation and the degree of ionisation in massive clumps within infrared dark clouds
• The Initial Conditions of Clustered Star Formation III. The Deuterium Fractionation of the Ophiuchus B2 Core
• Linking pre- and proto-stellar objects in the intermediate-/high-mass star forming region IRAS 05345+3157
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• Dense gas in IRAS 20343+4129: an ultracompact HII region caught in the act of creating a cavity
• Multiple low-turbulence starless cores associated with intermediate- to high-mass star formation
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• Deuterium chemistry of dense gas in the vicinity of low-mass and massive star forming regions
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• Massive star formation around I05345+3157 -- I. The dense gas
• Ongoing star formation in the proto-cluster IRAS 22134+5834
• AFGL 5157 NH${}_3$: A new stellar cluster in the forming