Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..554k&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, Oct.-Nov. 1981, p. 554-557.
Astronomy and Astrophysics
Astronomy
8
Distance, Galactic Clusters, High Speed, Low Speed, Red Shift, Velocity Distribution, Galactic Structure, Stellar Luminosity
Scientific paper
Independent determinations are made of the distances to the four high-velocity and one low-velocity members of Stephan's Quintet of galaxies, a compact group with discrepant redshifts. Optical velocity dispersions were determined for the four high-velocity galaxies based on observations made with the Photon Counting Reticon System on the Mount Hopkins 60-inch telescope, and used to estimate the luminosity, and thus the distances, of the galaxies. The distance of NGC 7320, the low-velocity member, was derived from inclination-corrected 21-cm line widths according to the Tully-Fisher method (1977). The data obtained support the view that all the objects are at distances consistent with their redshifts, with NGC 7320 representing a foreground object superposed against a distant group of objects, and are at variance with the conjecture of Arp (1973) of the physical relation of all the galaxies.
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