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An Upper Limit to the Molecular Density in IC 342

Serabyn, E. and Güsten, R. (1991) An Upper Limit to the Molecular Density in IC 342. In: Dynamics of Galaxies and their Molecular Cloud Distributions. IAU Symposium Proceedings Series. No.146. Kluwer , Dordrecht, p. 306. ISBN 9780792310969.

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A search for CS J=7−6 emission from the core of the galaxy IC342 was undertaken with the Caltech Submillimeter Observatory. At the line frequency of 342.883 GHz, the beamsize is 20″. An upper limit to T_(MB)Δv of 0.4 K km s^(−1) was obtained. This upper limit can be compared directly to the CS J=3−2 integrated line flux (3.1 K km s^(−1); Mauersberger and Henkel 1989), because the beam used for that observation was similar (17″). The J=7−6 to J=3−2 line ratio limit is 0.13 with no correction for the slight difference in beamsize, and ≈ 0.15 with this correction included. Assuming T_(kin) = 70 K (Martin and Ho 1986), this leads to a density upper limit of about 5 × 10^5 cm^(−3) for this gas.

Item Type:Book Section
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Additional Information:© 1991 IAU.
Series Name:IAU Symposium Proceedings Series
Issue or Number:146
Record Number:CaltechAUTHORS:20181207-124354568
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Official Citation:Serabyn, E., & Güsten, R. (1991). An Upper Limit to the Molecular Density in IC 342. Symposium - International Astronomical Union, 146, 306-306. doi:10.1017/S007418090024429X
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91575
Deposited By: Tony Diaz
Deposited On:07 Dec 2018 21:43
Last Modified:16 Nov 2021 03:42

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