Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pazh....9...67k&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 9, Feb. 1983, p. 67-74) Soviet Astronomy Letters (ISSN 0360-0327), vol. 9, Jan.-Feb. 19
Astronomy and Astrophysics
Astronomy
2
Astrometry, Error Analysis, Galactic Structure, Mass To Light Ratios, Radial Velocity, Red Shift, Astronomical Catalogs, Luminosity, Northern Sky, Velocity Measurement
Scientific paper
New radial velocities for 44 double galaxy systems are presented. The ratio k between the internal and external errors in the redshift data is estimated by comparing data from catalog galaxies with a sample from White et al. (1983). This ratio is found to increase from 1.0 to 2.1 from galaxies with strong emission lines to absorption-line objects. The disparity between the absolute and internal errors diminishes for the redshift differentials of pair components, because the individual errors in the redshifts measured for the members of a given pair are observed to be positively correlated. The average value of k for the whole sample is estimated by considering the values of the first four moments of the mass/luminosity ratio as functions of k. The absolute error in the redshift differential is 1.4 times the internal error, bringing the mean ratio of orbital mass to luminosity for 490 pairs into good agreement with the values determined from the differential rotation of galaxies.
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