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Corrections for Velocity Dispersion in the Tully-Fisher Relation

Published online by Cambridge University Press:  30 March 2016

L. Bottinelli ,
L. Gouguenheim ,
G. Paturel  and
G. de Vaucouleurs
L. Bottinelli
Affiliation:
Observatoire de Paris et Université Paris XI
L. Gouguenheim
Affiliation:
Observatoire de Paris et Université Paris XI
G. Paturel
Affiliation:
Observatoire de Lyon
G. de Vaucouleurs
Affiliation:
University of Texas at Austin

Extract

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The 21-cm line width is a good indication of the maximum rotational velocity in a galaxy. However, the turbulent motions affect the observed line width and must be corrected. Not taking them into account introduces both accidental and systematic errors.

A first example of this effect is the dependence of the slope a of the Tully-Fisher relation:

on the level at which the line width ΔVobs. is measured. In their 1977 paper, Tully and Fisher find the following values:

A second example is the departure from linearity in the H-band Tully-Fisher relation obtained by Aaronson et al. (1982) (their figure 2): the narrow lines are more strongly affected by these turbulent motions.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 6 , 1983 , pp. 283 - 285
Copyright
Copyright © Reidel 1983

References

Aaronson, M., Huchra, J., Mould, J.R., Tully, R.B., Fisher, J.R., van Woerden, H., Goss, W.M., Chamaraux, P., mebold, U., Siegman, B., Berriman, G., Persson, S.E., 1982, preprint Steward Obs. n°383Google Scholar
Aaronson, M., Mould, J.R., 1982, preprint of the Steward Obs. n°404Google Scholar
Bosma, A., 1978, Thesis, University of Groningen Google Scholar
Bottinelli, L., Gouguenheil, L., Paturel, G., Vaucouleurs, G.de, 1980 Ap. J. 242 LI53 CrossRefGoogle Scholar
Bottinelli, L., Gouguenheim, L., Paturel, G., Vaucouleurs, G.de, 1982 Astron. Astrophys. in pressGoogle Scholar
Fisher, J.R., Tully, R.B., 1981, Ap. J. Suppl. 47, 139 CrossRefGoogle Scholar
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Tully, R.B., Fisher, J.R., 1977, Astron. Astrophys. 54, 661 Google Scholar