A distance scale from the infrared magnitude/H I velocity-width relation. IV - The morphological type dependence and scatter in the relation; the distances to nearby groups

Details A distance scale from the infrared magnitude/H I velocity-width relation. IV - The morphological type dependence and scatter in the relation; the distances to nearby groups A distance scale from the infrared magnitude/H I velocity-width relation. IV - The morphological type dependence and scatter in the relation; the distances to nearby groups

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265....1a&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 1-17.

Astronomy and Astrophysics

Astronomy

215

Centimeter Waves, Galactic Clusters, Galactic Structure, Hubble Constant, Infrared Astronomy, Radial Velocity, Red Shift, Extragalactic Radio Sources, H Lines, Hubble Diagram, Milky Way Galaxy, Virgo Galactic Cluster

Scientific paper

A newly published catalog of infrared and 21 cm data for 300 galaxies in the Local Supercluster is analyzed in order to investigate empirically several properties of the Tully-Fisher relation. For this sample, we obtain the following results:
1. In the infrared, there is no significant dependence of the Tully-Fisher relation with type. A small type dependence is found in the blue; however, the spread in profile width at fixed magnitude is only about one-third as great as that found earlier by Roberts.
2. The slope of the Tully-Fisher relation is wavelength dependent, increasing in value from the blue to the infrared. The slope of the relation does appear steeper than previously indicated, though, and a small nonlinearity is identified.
3. The scatter in the Tully-Fisher relation is smaller in the infrared, where σ ∼ 0.45 mag, than in the optical.
Distances to a number of nearby groups are calculated using the absolute calibration from Paper I. Good agreement in relative distance is found with both the Sandage-Tammann and de Vaucouleurs scales. Current disagreement over the absolute distance scale and value of the Hubble constant appears reduced to two issues: the infall velocity toward Virgo, and the distance scale for galaxies in the neighborhood of the Milky Way. While the former now appears to be well under control, the latter will require considerable observational effort before being satisfactorily resolved.
We argue that the two competing local distance scales provide firm lower and upper limits to the value of the expansion rate. The calibration from Paper I, which falls between these limits, yields H0 = 82 ± 10 km s-1 Mpc-1. The formal error in this estimate is dominated by the adopted uncertainty in zero point of the IR/H I relation.

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