Arguments for a Hubble Constant near $H_0$ = 55

Details Arguments for a Hubble Constant near $H_0$ = 55 Arguments for a Hubble Constant near $H_0$ = 55

2001-06-26

arxiv.org/abs/astro-ph/0106466v1

Astronomy and Astrophysics

Astrophysics

condensed version submitted to ApJLetters

Scientific paper

10.1086/340057

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.

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