Stellar populations in shell galaxies

Abstract

view Abstract Citations (23) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stellar Populations in Shell Galaxies McGaugh, Stacy S. ; Bothun, Gregory D. Abstract UBV surface photometry of the shell galaxies Arp 230, NGC 7010, and Arp 223 is presented. We find all 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. Our data indicate that the timescale since the interaction is typicaly ~ 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. Publication: The Astronomical Journal Pub Date: October 1990 DOI: 10.1086/115580 Bibcode: 1990AJ....100.1073M Keywords: Galactic Structure; Star Distribution; Star Formation; Astronomical Photometry; Color-Color Diagram; Ultraviolet Radiation; Astronomy; GALAXIES: INTERACTIONS; GALAXIES: STELLAR CONTENT full text sources ADS | data products SIMBAD (9) NED (3)