Arguments for a Hubble Constant near $H_0$ = 55

Abstract

Recent analyses of Cepheid distances to spiral galaxies have led to an announcement of a Hubble constant of $H_0=72\pm 8$ km/sec/Mpc. The new Cepheid distances, however, show that there are numerous redshift distances with large excesses which cannot be due to peculiar velocities. Ignoring these discordant redshifts, if the Hubble constant is calibrated with Cepheid distances of low redshift spirals a value near $H_0$ = 55 is obtained. Use of independent distance criteria such as Tully-Fisher and group membership verifies this value and leads to three conclusions: 1) The peculiar velocities of galaxies in space are characteristically small. 2) Sc companions to normal Sb's tend to be less luminous, with younger stellar populations and small amounts non velocity redshift. 3) ScI and other purportedly over luminous spirals have large amounts of intrinsic redshift.

condensed version submitted to ApJLetters

References in corpus (3)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• The Discovery of Cepheids and a New Distance to NGC 2841 Using the Hubble Space Telescope
• Cepheid Calibration of the Peak Brightness of SNe Ia. X. SN 1991T in NGC 4527

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