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Properties of the Molecular Arms in the Galaxies M51, M101 and IC342

Published online by Cambridge University Press:  03 August 2017

G. Rydbeck ,
Å. Hjalmarson ,
T. Wiklind ,
H. Olofsson  and
O.E.H. Rydbeck
G. Rydbeck
Affiliation:
Onsala Space Observatory S − 43900 Onsala Sweden
Å. Hjalmarson
Affiliation:
Onsala Space Observatory S − 43900 Onsala Sweden
T. Wiklind
Affiliation:
Onsala Space Observatory S − 43900 Onsala Sweden
H. Olofsson
Affiliation:
Onsala Space Observatory S − 43900 Onsala Sweden
O.E.H. Rydbeck
Affiliation:
Onsala Space Observatory S − 43900 Onsala Sweden

Extract

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M51, M101 and IC342 were all observed in the CO(1-0) line with the Onsala 20 m antenna. “The average pointing error for a 20 minute run is less than 5”, usually considerably less, and the receivers are stable. The error lobe is considerable with an efficiency of about 40%. With a width of about 20′ it is of little importance compared to an emission region of 2′ to 3′ however. Of more concern is an upper and a lower sidelobe with a combined efficiency of about 14%.

Type
III- Observations of Spiral Structure
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 59 - 61
Copyright
Copyright © Kluwer 1991 

References

Referenses

Elmegreen, B, 1988 in “Galactic and Extragalactic Star Formation, “ ed. Pudritz, R.E. and Fich, M., Dortrecht: Reidel.Google Scholar
Rand, R., and Kulkarni, S., 1990 Ap.J. Lett. 349:L43–L46 Google Scholar
Rydbeck, G., Hjalmarson, Å., Johansson, L.E.B., Rydbeck, O.E.H., and Wiklind, T., 1987, NASA Conf., Star formation in galaxies, ed Lonsdale-Persson, C.J., NASA Conf. Publ. 2466.Google Scholar