Mathematics – Logic
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359....4v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 4-14.
Mathematics
Logic
31
Charge Coupled Devices, Galactic Clusters, Galactic Structure, Interstellar Matter, Corona Borealis Constellation, Planetary Nebulae, Red Shift, Spiral Galaxies, Stellar Luminosity, Virgo Galactic Cluster
Scientific paper
Morphological classifications of 231 galaxies in and near the Virgo and Ursa Major clusters are reported which show that luminosity classification techniques (LCTs) can be used to determine the luminosities of spiral galaxies with an accuracy of about 0.7 mag on CCD frames. The observations in the direction of the Virgo Cluster confirm the assignment of some galaxies to the background field, strongly confirming that the large dispersion in the Tully-Fisher relation for Virgo galaxies is at least partly due to contamination of the Virgo core sample by background galaxies. LCTs yield a distance of 15.3 + 2.6 or - 2.2 Mpc for the spiral and irregular galaxies associated with the core of the Virgo Cluster proper. The Ursa Major and Virgo cluster distances are found to be the same. A class of galaxies with fuzzy, anemic outer structure and active star formation in their cores is found to be common in Virgo but rare in the Ursa Major Cluster.
Pierce Michael J.
Tully Brent R.
van den Bergh Sidney
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