Tully-Fisher distances to M31-like galaxies in the Coma cluster

Details Tully-Fisher distances to M31-like galaxies in the Coma cluster Tully-Fisher distances to M31-like galaxies in the Coma cluster

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..211r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 263, no. 1, p. 211-228.

Astronomy and Astrophysics

Astronomy

11

Distance, Galactic Clusters, Red Shift, Spiral Galaxies, Stellar Luminosity, Astronomical Spectroscopy, Calibrating, Infrared Astronomy, Interstellar Extinction, Sky Surveys (Astronomy)

Scientific paper

Newly observed H I 21 cm linewidths for eight galaxies and morphological types for 33 galaxies are combined with data in the literature to construct a homogeneous magnitude-limited sample of spiral galaxies in the Coma cluster. From this sample, we identify the seven Coma M31-like galaxies, i.e. the spiral members with inclinations larger than -44 deg and deprojected linewidths larger than -440 km/s. The distance moduli of these seven galaxies obtained by application of a blue-band Tully-Fisher (TF) relation are used to measure the distance to the Coma cluster. Our result, which is free of 'Malmquist' bias at the 3 sigma level, is a distance modulus of micron(0) = 34.4 +/- 0.2, which corresponds to a Hubble constant H(0) of about 90 km/s Mpc. The observed rms dispersion of blue-band TF distance moduli for the seven Coma M31-like galaxies is 0.14 mag, which is consistent with observational uncertainties alone, i.e. no intrinsic dispersion of the blue-band TF relation has been detected above the observational rms noise level of 0.14 mag. This small scatter is a specific result of our strict selection criteria adopted at the onset of the analysis.

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