Spectroscopic study of non-cluster early-type galaxies

Details Spectroscopic study of non-cluster early-type galaxies Spectroscopic study of non-cluster early-type galaxies

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..323l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 2, June 1990, p. 323-330.

Astronomy and Astrophysics

Astrophysics

3

Astronomical Spectroscopy, Elliptical Galaxies, Galactic Evolution, Abundance, Brightness Distribution, Cn Emission, Galactic Rotation, Interacting Galaxies, Metallicity

Scientific paper

Data from long-slit spectroscopic observations of eight binary, triple, or merging groups containing early-type galaxies (Laurikainen and Moles, 1989) are compiled in tables and graphs and analyzed in detail, with a focus on the older stellar populations. A clear distinction is found between elliptical galaxies interacting in clusters and isolated ellipticals: the latter are redder and have lower surface brightness and stronger metal lines, suggesting a formation process involving mergers. A high degree of variation is found in the MgH and CN band strengths of metal-rich interacting galaxies, with strong values for 'metals' attributed to high Fe I (+ CN) values and increased CN abundance.

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