A test of Tully-Fisher distance estimates using Cepheids and SNIa

Details A test of Tully-Fisher distance estimates using Cepheids and SNIa A test of Tully-Fisher distance estimates using Cepheids and SNIa

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.290l..77s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 290, Issue 4, pp. L77-L83.

Astronomy and Astrophysics

Astronomy

29

Supernovae: General, Cepheids, Galaxies: Distances And Redshifts

Scientific paper

We make a direct test of Tully-Fisher distance estimates to 11 spiral galaxies with Hubble Space Telescope (HST) Cepheid distances, and to 12 spiral galaxies with Type Ia supernova (SNIa) distances. The HST Cepheid distances come from the work of Freedman, Sandage et al. and Tanvir et al. The SNIa distances come from Pierce, calibrated using the Cepheid results of Sandage et al. The Tully-Fisher distances mostly come from the work of Pierce. The results show that the Tully-Fisher distance moduli are too short with respect to the Cepheid distances by 0.41+/-0.14 mag, and too short with respect to the SNIa distances by 0.46+/-0.19 mag. Combining the HST Cepheid and SNIa data suggests that, overall, previous Tully-Fisher distances were too short by 0.43+/-0.11 mag, a result which is significant at the 3.8sigma level. The Tully-Fisher distance errors appear to increase as galaxy linewidth decreases, which may signify the presence of Malmquist bias. These data therefore indicate that previous Tully-Fisher distances at v~1000 km s^-1 should be revised upwards by ~22+/-6 per cent implying, for example, a Virgo distance of 19.0+/-1.8 Mpc. The value of H_0 from Tully-Fisher estimates is correspondingly revised downwards from H_0=84+/-10 to H_0=69+/-8 km s^-1 Mpc^-1.

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