The 21 centimeter line width as an extragalactic distance indicator. III - The correction for velocity dispersion and the B- and H-band Tully-Fisher relations

Details The 21 centimeter line width as an extragalactic distance indicator. III - The correction for velocity dispersion and the B- and H-band Tully-Fisher relations The 21 centimeter line width as an extragalactic distance indicator. III - The correction for velocity dispersion and the B- and H-band Tully-Fisher relations

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280...34b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 1, 1984, p. 34-40.

Astronomy and Astrophysics

Astronomy

24

Astrometry, Astronomical Photometry, Centimeter Waves, Distance, Galactic Rotation, Radio Sources (Astronomy), Correction, Galactic Structure, Spectral Line Width, Turbulence

Scientific paper

The curvature of the H-band Tully-Fisher relation reported by Aaronson and Mould (1983) is demonstrated to be wholly a result of neglecting the corrections for bandwidth and turbulent velocities. The application of the correction model of Bottinelli et al. (1980, 1982, 1983) eliminates the curvature and decreases the slope of the linearized H-band relation to the previously determined value of 9.7. The curvature of the H-band relation disappears when the correction for velocity dispersion derived for the B-band is applied to the H-band data. After correction for the effect of bandwidth and velocity dispersion, the slope and zero point of the H-band relation are nearly independent of type. For well observed galaxies, it is shown that the distance moduli derived from the B- and H-band relations, both corrected for line broadening, have mean errors of, respectively, 0.3 and 0.4 mag.

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