Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-11-21
Astronomy and Astrophysics
Astrophysics
10 pages, 4 figures, LaTeX with AIP "aipproc" style file. A 300KB PostScript version is available at http://www.astro.lsa.um
Scientific paper
10.1063/1.52761
Star formation in elliptical galaxies (Es) was and is mostly dominated by mergers and accretions with many suggestive examples seen among local galaxies. Present day star formation in Es is easily measurable in two thirds of Es and appears bursty in character. Direct age determinations from integrated light indicate real age scatter. If one assumes the oldest-looking galaxies are a Hubble time old, the light weighted mean ages of the rest spread to 0.5 of a Hubble time, with scatterlings at very young ages. Larger Es and Es in clusters have less age scatter than smaller or field Es. The size trend is clear. The environment trend needs to be rechecked with better data even though it agrees with high redshift field/cluster results.
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