Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-10
Astronomy and Astrophysics
Astrophysics
25 pages, including 10 tables, 5 figures. Submitted to Ap&SS
Scientific paper
The Tully-Fisher (TF) relation calibrated in both the B-band and the I-band indicates that (1) the redshift distribution of Virgo Cluster spirals has a morphological dependence that is inconsistent with a peculiar velocity interpretation. (2) Galaxies of morphology similar to ScI galaxies have a systematic excess redshift component relative to the redshift expected from a Hubble Constant of 72 km s-1 Mpc-1. (3) Pairs and groups of galaxies exist for which the TF relation provides excellent agreement among individual members, but for which the group redshift deviates strongly from the predictions of the Hubble Relation. It is again found that morphology plays a role as these galaxies are all of Hubble types Sbc and Sc. The overall results of this study indicate that normal Sbc and Sc galaxies have a systematic excess redshift component relative to the predictions of the standard Hubble relation assuming a Hubble Constant of 72 km s-1 Mpc-1. The excess redshifts identified in this analysis are consistent with the expectations of previous claims for non-cosmological (intrinsic) redshifts.
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