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An Exploration of the Tully-Fisher Relation for Extreme Late-Type Spiral Galaxies | | L. D. Matthews
; W. van Driel
; J. S. Gallagher
; | | Date: |
2 Oct 1998 | | Subject: | astro-ph | | Affiliation: | State University of New York at Stony Brook & NRAO), W. van Driel(Observatoire de Paris), J. S. Gallagher (University of Wisconsin--Madison | | Abstract: | This paper explores the adherence of 47 extreme late-type galaxies to the B- and V-band Tully-Fisher relations defined by a sample of local calibrators. In both bands we find the mean luminosity at a given line width for extreme late-type spirals to lie below that predicted by standard Tully-Fisher relations. While many of the extreme late-type spirals do follow the Tully-Fisher relation to within our observational uncertainties, most of these galaxies lie below the normal, linear Tully-Fisher relation, and some are underluminous by more than 2 sigma (i.e. >1.16 magnitudes in V). This suggests a possible downward curvature of the Tully-Fisher relation for some of the smallest and faintest rotationally supported disk galaxies. This may be a consequence of the increasing prevalence of dark matter in these systems. We find the deviation from the Tully-Fisher relation to increase with decreasing luminosity and decreasing optical linear size in our sample, implying that the physically smallest and faintest spirals may be a structurally and kinematically distinct class of objects. | | Source: | arXiv, astro-ph/9810042 | | Services: | Forum | Review | PDF | Favorites | |
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