Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf...42n&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 42-43 (SEE N93-26706 10-90)
Astronomy and Astrophysics
Astronomy
Astronomical Catalogs, Flow Distribution, Group Velocity, Interstellar Extinction, Planetary Nebulae, Stellar Luminosity, Velocity Distribution, Virgo Galactic Cluster, Algorithms, Brightness, Percolation
Scientific paper
A new identification of groups and clusters in the CfAl Catalog of Huchra, et al. (1983) is presented, using a percolation algorithm to identify density enhancements. The procedure differs from that of the original Geller and Huchra (1983; GH) catalog in several important respects; galaxy distances are calculated from the Virgo-Great Attractor flow model of Faber and Burnstein (1988), the adopted distance linkage criteria is only approx. 1/4 as large as in the Geller and Huchra catalog, the sky link relation is taken from Nolthenius and White (1987), correction for interstellar extinction is included, and 'by-hand' adjustments to group memberships are made in the complex regions of Virgo/Coma I/Ursa Major and Coma/A1367 (to allow for varying group velocity dispersions and to trim unphysical 'spider arms'). Since flow model distances are poorly determined in these same regions, available distances from the IR Tully-Fisher planetary nebula luminosity function and surface brightness resolution methods are adopted if possible.
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