On the derivation of the Tully-Fisher relations. II. Field galaxies, the inverse TF slope and the Hubble constant.

Details On the derivation of the Tully-Fisher relations. II. Field galaxies, the inverse TF slope and the Hubble constant. On the derivation of the Tully-Fisher relations. II. Field galaxies, the inverse TF slope and the Hubble constant.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325...33e&link_type=abstract

Astronomy and Astrophysics, v.325, p.33-40

Astronomy and Astrophysics

Astrophysics

4

Distance Scale

Scientific paper

The Hubble constant H_0_ should not show distance-dependence. An inappropriate use of the direct Tully-Fisher relation may lead to a conclusion that H_0_ is dependent on the distance. This paper tries to answer the question: is it possible to avoid the caveats of the direct relation by applying the inverse Tully-Fisher relation. Under ideal conditions it is possible simultaneously to determine the inverse slope precisely and to find the Hubble constant next to calibration. Ideal conditions are, however, rarely met. Two particular sources of error in the resulting average Hubble constant are considered. A progressive measurement error in angular diameters (apparent magnitudes) causes overestimation of H_0_. An asymmetry in the logV_max_-distribution in the sense of a tail of small rotational velocities tends to shift H_0_ upwards.

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