Nonlinearity of the Tully-Fisher relation

Details Nonlinearity of the Tully-Fisher relation Nonlinearity of the Tully-Fisher relation

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..112m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 112-117.

Astronomy and Astrophysics

Astronomy

21

Dark Matter, Luminosity, Mass To Light Ratios, Red Shift, Spiral Galaxies, Astronomical Photometry, Extragalactic Radio Sources, Infrared Sources (Astronomy)

Scientific paper

Because the fraction of dark matter in spiral galaxies varies with luminosity, or for a number of other possible reasons, the relation between infrared luminosity and velocity width has previously been shown to be nonlinear. The relation between surface brightness and velocity width is now demonstrated to be nonlinear also. When these nonlinearities are taken into account, an apparent trend in surface brightness of cluster spirals with redshift is shown to be spurious. Apparent correlations of surface brightness and slope on cluster richness and cluster velocity dispersion also disappear. Neither this effect, nor an apparent trend in slope of the infrared Tully-Fisher relation with Hubble type, in themselves imply that the Tully-Fisher relation depends on the environment in which galaxies are located.

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