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Global Properties of the Galaxies in the FCRAO Extragalactic CO Survey

Published online by Cambridge University Press:  03 August 2017

P. Knezek ,
J. Young ,
L. Allen ,
J. Carpenter ,
J. Case ,
M. Claussen ,
N. Devereux ,
Y. Huang ,
J. Kenney  and
P. Schloerb
...Show all authors
P. Knezek
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
J. Young
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
L. Allen
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
J. Carpenter
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
J. Case
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
M. Claussen
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
N. Devereux
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
Y. Huang
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
J. Kenney
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
P. Schloerb
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
S. Schneider
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
L. Tacconi
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
L. Tacconi-Garman
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
P. Viscuso
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA
S. Xie
Affiliation:
Department of Physics and Astronomy and Five College Radio Astronomy Observatory University of Massachusetts, Amherst MA 01003 USA

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We have examined the global properties of 250 galaxies and galaxy pairs observed as part of the Five College Radio Astronomy Observatory (FCRAO) Extragalactic CO Survey with respect to bar type and arm type, and we have compared the results with the global properties of the same galaxies as a function of morphological type. The bar types of the galaxies were taken from RC2, and the arm types for 48% of the sample were taken from Elmegreen and Elmegreen (1987). We find the following:

1) There is little dependence of the star formation efficiency, as measured by the global FIR luminosity to molecular gas mass ratio, on bar type. Similarly, we find no obvious correlation between the global ratio of molecular to atomic gas mass and the bar type.

2) Variations of up to a factor of 6 are seen in the mean star formation efficiency with arm type, where flocculent galaxies appear to have slightly higher global star formation efficiencies than spirals with clearly delineated arms. Variations in the mean molecular to atomic gas mass ratio of a factor of 5 are seen as a function of arm type, but there is no apparent trend from flocculent to grand design spirals.

3) The decrease of a factor of 20 in the molecular to atomic gas mass ratio observed as a function of morphological type (Young and Knezek 1989) is more pronounced than the same ratio as a function of bar or arm type.

Type
V- CO in Galactic Disks
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 147
Copyright
Copyright © Kluwer 1991 

References

de Vaucouleurs, G., de Vaucouleurs, A., and Corwin, H. 1976, Second Reference Catalogue of Bright Galaxies, (University of Texas Press: Austin) (RC2).Google Scholar
Elmegreen, D.M., and Elmegreen, B.G. 1987, Ap.J., 314, 3.Google Scholar
Young, J.S., and Knezek, P. 1989, Ap.J.(Letters), 347, L55.CrossRefGoogle Scholar