Mathematics – Logic
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..596l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 596-600, 603-608. Research supported by ARCS Foundat
Mathematics
Logic
157
Galactic Clusters, Galactic Evolution, Interacting Galaxies, Emission Spectra, Interactions, Line Spectra, Red Shift, Star Formation
Scientific paper
The spectra and images of 10 blue emission-line galaxies observed in Abell 963 (5), Abell 2111 (4), and Abell 2125 (1) are presented. A wide range in the spectral properties of the galaxies is found, yet the large majority of the galaxies has spectra which are consistent with very recent star formation. Only one of the 10 galaxies appears to contain an active nucleus. Since star formation is now occurring in these galaxies, residual effects from the triggering mechanism may still be apparent. Images of these emission-line galaxies show that several appear to be members of interacting systems. Others show evidence for possible interactions, either being somewhat morphologically disturbed or having disturbed neighbor galaxies. To test the idea of interactions, a nearest neighbor analysis on these emission-line galaxies and a sample of red galaxies was performed using the Kolmogorov-Smirnov test. The emission-line galaxies have closer neighbor galaxies than the red galaxy sample at greater than the 98 percent level of confidence. From this result and from the images themselves, it is concluded that galaxy-galaxy interactions can induce 'bursts' of star formation and are an active agent of the 'Butcher-Oemler' effect at redshifts near 0.2. These interactions may be the primary cause of the 'B-O' effect.
Henry Patrick J.
Lavery Russell J.
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