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CO observations of spiral structure and the lifetime of giant molecular clouds

Scoville, N. Z. and Solomon, P. M. and Sanders, D. B. (1979) CO observations of spiral structure and the lifetime of giant molecular clouds. In: The Large-Scale Characteristics of the Galaxy. IAU Symposium Proceedings Series. No.84. D. Reidel , Dordrecht, pp. 277-283. ISBN 9789027710291. http://resolver.caltech.edu/CaltechAUTHORS:20181116-095208580

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Abstract

Observations of CO emission at ℓ=0 to 70°, |b| ≤ 1° are analyzed to give a map of the molecular cloud distribution in the galaxy as viewed from the galactic pole. From the fact that this distribution shows no obvious spiral pattern we conclude that the giant molecular clouds sampled in the CO line are situated in both arm and interarm regions and they must last more than 10^8 years. A similar age estimate is deduced from the large mass fraction of H_2 in the interstellar medium in the interior of the galaxy. An implication of this longevity is that the great masses of these clouds may be accumulated through cloud-cloud collisions of originally smaller clouds.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1017/S0074180900014625DOIArticle
ORCID:
AuthorORCID
Scoville, N. Z.0000-0002-0438-3323
Sanders, D. B.0000-0002-1233-9998
Additional Information:© 1979 by the IAU. This is contribution number 279 of the Five College Observatories. This research is supported by National Science Foundation grant AST76-24610.
Funders:
Funding AgencyGrant Number
NSFAST 76-24610
Record Number:CaltechAUTHORS:20181116-095208580
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181116-095208580
Official Citation:Scoville, N., Solomon, P., & Sanders, D. (1979). CO observations of spiral structure and the lifetime of giant molecular clouds. Symposium - International Astronomical Union, 84, 277-283. doi:10.1017/S0074180900014625
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90955
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Nov 2018 19:49
Last Modified:16 Nov 2018 19:49

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