Mathematics – Logic
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297...90s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 90-97.
Mathematics
Logic
4
Astronomical Spectroscopy, Galactic Clusters, Red Shift, Spiral Galaxies, Astronomical Maps, Emission Spectra, H Alpha Line, Luminosity, Tides, Velocity Distribution
Scientific paper
The system 0213-2836 comprises a spiral galaxy with two apparent companions. One of the smaller galaxies is at a similar redshift to the main galaxy and appears to be tidally interacting with it. The second partner, however, has a much higher velocity, and has been claimed as a convincing case of a noncosmological redshift. The velocity field of the system has been investigated and shows interaction with the nonanomalous companion but no sign of tidal disturbance near the anomalous companion. Narrow-band H-alpha images show the same pattern, with activity on one side and no activity on the other side. Two nearby galaxies of small angular size have the same redshift as the high-velocity anomaly. These results demonstrate that there is a background group of galaxies which happens to coincide with a disturbed foreground spiral and its interacting companion. The observations are easily explained without recourse to a noncosmological redshift.
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