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Dense cloud cores

Güsten, R. and Schulze, A. and Serabyn, E. (1991) Dense cloud cores. In: Fragmentation of Molecular Clouds and Star Formation. Springer Netherlands , Dordrecht, pp. 430-431. ISBN 9780792311591.

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In order to search for ultra-dense gas condensations as possible sites of future star formation, observations with highest possible angular resolution in high-gas density probing molecular species are required. Here we report first results from two-telescope (IRAM 30-m & CSO 10.4-m) multi-transition excitation studies of the linear molecules CS and HCN, both with critical densities ncτ107 cm⁻³. We obtained maps towards a number of galactic cloud cores in the CS(J=5−4;7−6) and the HCN(3−2;4−3) mm/submm transitions and those of their optically thin isotopic species (C³⁴S; H¹³CN) accessible from ground. For a proper excitation analysis, the gas temperature has been determined independently from the symmetric top molecules NH₃ or CH₃CN. Here we present first results obtained towards the NGC 2024 molecular cloud core (Schulz et al. 1990).

Item Type:Book Section
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Additional Information:© Springer Science+Business Media Dordrecht 1991.
Subject Keywords:Brightness Temperature, Angular Resolution, Molecular Line, Cloud Core, Dust Lane
Record Number:CaltechAUTHORS:20201104-193125504
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106445
Deposited By: Rebecca Minjarez
Deposited On:12 Nov 2020 17:19
Last Modified:16 Nov 2021 18:54

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