Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..530b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Feb. 1990, p. 530-539.
Astronomy and Astrophysics
Astronomy
38
Early Stars, Star Formation, Stellar Gravitation, Virgo Galactic Cluster, Aerospace Environments, Morphology, Spectral Methods
Scientific paper
Gravity-sensitive spectral indices in the blue spectral region were used to study the mean stellar surface gravity of early-type galaxies in a variety of galaxian environments. The findings confirm earlier work that the mean surface gravity in integrated light is high for isolated and Virgo Cluster E/S0 galaxies, but there is evidence to suggest that the mean surface gravity for similar galaxies in rich clusters is significantly lower. This indicates that galaxies in dense environments may be older on average than their counterparts in lower-density regions. Possible selection effects and systematic errors are discussed. It is concluded that star formation in galaxies was truncated at an earlier epoch (on average) in dense environments. However, the strength of this result would be weakened if there were large 'age' gradients within these galaxies.
Bower Richard G.
Ellis Richard S.
Rose James A.
Sharples Ray M.
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