Summary
Massive early-type galaxies at intermediate redshift provide a unique perspective on star formation at early times. The rest-frame UV spectra of passively evolving systems provide constraints on the formation redshift and abundances for the oldest stars at a time when the universe was roughly 1/3 its present age. The passive galaxies have spectra characteristic of F stars with strong absorption from MgII, MgI and FeII. Best fitting ages are in the 1-3Gyr range and models with solar or super-solar abundances are preferred. These properties point towards an early formation epoch and rapid down-sizing in the star formation rate.
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McCarthy, P. (2009). Rest-Frame UV and Visible Properties of Early Type Galaxies at 1 < z < 2. In: New Quests in Stellar Astrophysics II. Astrophysics and Space Science Proceedings. Springer, New York, NY. https://doi.org/10.1007/978-0-387-87621-4_2
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DOI: https://doi.org/10.1007/978-0-387-87621-4_2
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