Rotational Linewidths and the Size of M31 as a Distance Calibrator

Details Rotational Linewidths and the Size of M31 as a Distance Calibrator Rotational Linewidths and the Size of M31 as a Distance Calibrator

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110..634i&link_type=abstract

Astronomical Journal v.110, p.634

Astronomy and Astrophysics

Astronomy

5

Distance Scale

Scientific paper

Sandage [ApJ, 403,3(1993a); 404,419 (1993b)] has presented an argument in favor of low H_0_ by equating the diameter of M31 with the mean of a sample of similar galaxies, using this to calibrate the distance scale to Virgo. Here we argue based on a wider sample taken from Tully [Nearby Galaxies Catalog (Cambridge University Press, Cambridge, 1988)) that the rotational linewidth W_R_^i^ of M31 implies that M31 is not representative of an average-size galaxy. Linear diameters are estimated from linewidth information and the Tully-Fisher relation in order to estimate a less biased calibration of M31 relative to a sample of similar spirals.

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