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The Tully-Fisher Relation Using the CO-Line for Interacting Galaxies

Published online by Cambridge University Press:  25 May 2016

Y. Tutui  and
Y. Sofue
Y. Tutui
Affiliation:
Institute of Astronomy, University of Tokyo Mitaka, Tokyo 181, Japan
Y. Sofue
Affiliation:
Institute of Astronomy, University of Tokyo Mitaka, Tokyo 181, Japan

Extract

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The CO Tully-Fisher (TF) relation is able to measure the distances to farther galaxies than the HI TF relation reaches (Sofue et al. 1997). The galaxies observed for the CO TF relation at the high redshift are often infrared luminous galaxies. The fraction of interacting galaxies is large in the infrared luminous galaxies. Therefore, first we have analyzed the CO and HI linewidths for nearby interacting galaxies in order to examine the influence of the interaction on the linewidths. We found that HI linewidths for the interacting galaxies are significantly larger than CO (Tutui and Sofue 1997a). It suggests that the influence of the interaction is smaller at the inner region of galaxies where the CO gas exists, and that the CO TF relation is more reliable tool for the galaxies which have the evidence of the galaxy interaction as well as galaxies in rich clusters.

Type
III. Galaxy Formation and Evolution
Information
Symposium - International Astronomical Union , Volume 183: Cosmological Parameters and the Evolution of the Universe , 1999 , pp. 165
Copyright
Copyright © Kluwer 1999 

References

Persic, M., Salucci, P., Stel, F., 1996, MNRAS 281, 27 CrossRefGoogle Scholar
Sofue, Y., Tutui, Y., Honma, M., Ichikawa, T., Wakamatsu, K., Kazes, I. & Dickey, J. 1997, in these proceedings Google Scholar
Tutui, Y., Sofue, Y. 1997a, submitted to PASJ Google Scholar
Tutui, Y., Sofue, Y. 1997b, A&A in press Google Scholar