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The Correlation Between Galaxy HI Linewidths and K' Luminosities

B. Rothberg·W. Saunders·R. B. Tully·P. L. Witchalls
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Abstract

The relationship between galaxy luminosities and rotation rates is studied with total luminosities in the K' band. Extinction problems are essentially eliminated at this band centered at 2.1 micron. A template luminosity-linewidth relation is derived based on 65 galaxies drawn from two magnitude-limited cluster samples. The zero-point is determined using 4 galaxies with accurately known distances. The calibration is applied to give the distance to the Pisces Cluster (60 Mpc) at a redshift in the CMB frame of 4771 km/s. The resultant value of the Hubble Constant is 81 km/s/Mpc. The largest sources of uncertainty arises from the small number of zero-point calibrators at this time at K' and present application to only one cluster.

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B. Rothberg, W. Saunders, R. B. Tully, P. L. Witchalls. 1999-11-04. The Correlation Between Galaxy HI Linewidths and K' Luminosities. https://doi.org/10.1086/308699

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