Energy Distributions and the Formation Times of Spheroidal Populations

Details Energy Distributions and the Formation Times of Spheroidal Populations Energy Distributions and the Formation Times of Spheroidal Populations

1999-08-20

arxiv.org/abs/astro-ph/9908239v1

Astronomy and Astrophysics

Astrophysics

10 pages. LaTeX text file, 2 PS files, 2 style files. Article to appear in "Building the Galaxies: From the Primordial Univers

Scientific paper

I review recent progress in exploring the formation times of spheroidal stellar populations (elliptical galaxies and large spiral bulges) using spectrophotometric techniques. A quickly growing body of evidence shows that although massive spheroids can form at early times, there are strong environmental dependencies, and major transitions in star formation histories and even morphologies are detectable to surprisingly small redshifts (z ~ 0.2). These features are consistent with neither the strict monolithic collapse nor hierarchical merging scenarios. Restframe UV observations are a promising means of improving our understanding of spheroid evolution.

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