Other
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1073m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Oct. 1990, p. 1073-1085.
Other
15
Galactic Structure, Star Distribution, Star Formation, Astronomical Photometry, Color-Color Diagram, Ultraviolet Radiation
Scientific paper
UBV surface photometry of the shell galaxies Arp 230, NGC 7010, and Arp 223 is presented and all are found to be the result of mergers. In Arp 230. the merger of two spirals induced a burst of star formation which has declined in strength since the collision. The remnant seems likely to become elliptical. NGC 7010 has very red shells, perhaps redder than the galaxy itself. Evolution of the stellar content of these shells may be important. Arp 223 has shell colors which are slightly bluer than the main body of the galaxy, consistent with an origin in an Sb. Data indicate that the timescale since the interaction is typically approximately equal to 1 Gyr. Moreover, those ellipticals that have been formed by mergers should have complex stellar populations with a component formed in the collision. This extra component might be detectable by the methods of empirical population synthesis, at least to some age limit, making it possible to investigate the relative numbers of ellipticals formed in this manner by methods other than morphology.
Bothun Gregory D.
McGaugh Stacy S.
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