Direct determination of extragalactic distances from the 21 centimeter line width and the method of 'sosies'

Details Direct determination of extragalactic distances from the 21 centimeter line width and the method of 'sosies' Direct determination of extragalactic distances from the 21 centimeter line width and the method of 'sosies'

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..382p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 382-386. Research supported by the Ministere des Aff

Mathematics

Logic

22

Distance, Extragalactic Radio Sources, Galactic Structure, Spectral Line Width, Calibrating, Hubble Constant, Microwave Spectra

Scientific paper

The relation reported by Tully and Fisher (1977) provides one of the best methods for estimating distances to rotating disk galaxies. However, several questions concerning the application of this relation are still being debated. The present investigation is concerned with an approach which bypasses these difficulties by making use of the method of 'sosies' (or 'look-alikes'). A selection of galaxies having the same morphological type, inclination, and 21 cm line width (corrected for velocity resolution only) must, according to the Tully-Fisher (T-F) relation, contain galaxies of nearly the same absolute luminosity. The difference of distance moduli between two 'sosie' galaxies will be directly given by the difference of their apparent magnitudes (corrected only for differential galactic extinction) or the ratio of their apparent diameters. Attention is given to the application of the considered approach, second-order corrections, Hubble ratios and corrected Hubble ratios.

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