Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256...54a&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 54-74.
Astronomy and Astrophysics
Astrophysics
34
Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, Galactic Clusters, Galactic Evolution, Red Shift, Spectrum Analysis
Scientific paper
It is established, by spectroscopic measures of a class of objects consisting of 87 companion galaxies apparently associated with 61 larger galaxies, that the spectral characteristics of the companions relative to the larger galaxies are: (1) a tendency for the companions to have more emission and higher excitation, and (2) their exhibiting of earlier-type absorption spectra. Differential redshifts are analyzed for the cases where the companions could be accepted as physically associated, at values of + or - 800 km/sec. Positive differential redshifts are found to outnumber negative ones by 36 to 15, with the remainder ranging from +4000 to +36,000 km/sec. It is suggested that not many of the companions can be considered to be accidental projections of background galaxies.
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