Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..620k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. 620-640. SNSF-supported research.
Astronomy and Astrophysics
Astronomy
120
Hubble Constant, Local Group (Astronomy), Radio Sources (Astronomy), Spectral Line Width, Virgo Galactic Cluster, Cosmology, Distance, Spiral Galaxies
Scientific paper
Locally calibrated blue and infrared Tully-Fisher (TF) relations are applied to an 82 percent complete sample of 81 Sab-Sm galaxies which are bona fide members of the Virgo Cluster. A nearly unbiased Virgo modulus of 31.60 + or - 0.15 can be derived in perfect agreement with independent recent determinations. It is shown that the blue TF and infrared TF relations give almost identical distance moduli from any selected Virgo subsample. The intrinsic scatter about the two TF relations is 0.7 mag, considerably larger than the observed scatter in the UMa Cluster and in 10 more distant clusters. Distance determination of these clusters therefore can be achieved only by fitting the upper envelopes of their TF relations onto the blue and infrared upper envelopes of the Virgo Cluster. The resulting distances define a linear expansion law with a small scatter. The present cluster data require H0 = 56.6 + or - 0.9 km/s/Mpc.
Cameron L. M.
Kraan-Korteweg Renee C.
Tammann Gustav A.
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