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The UV upturn phenomenon in the hierarchical universe

Published online by Cambridge University Press:  17 August 2012

Jaehyun Lee  and
Sukyoung K. Yi
Jaehyun Lee
Affiliation:
Department of Astronomy & Yonsei University Observatory, Yonsei University, Seoul 120-749, Republic of Korea email: [email protected]
Sukyoung K. Yi
Affiliation:
Department of Astronomy & Yonsei University Observatory, Yonsei University, Seoul 120-749, Republic of Korea email: [email protected]
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Abstract

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Recent studies show that an old stellar population with high metallicity in the monolithic paradigm can explain the UV upturn. Numerical simulations and empirical studies however point out that massive early-type galaxies have evolved hierarchically with an extended star formation history. This obviously has an impact on our traditional understanding on the UV upturn and requires a new investigation on its origin. We report on our investigation on the evolutionary history of model galaxy SEDs in the hierarchical scenario. The use of conventional population models (calibrated to the monolithic picture) in combination with merger trees and extended star formation fails to reproduce the observed UV upturn. If a hierarchical picture is thought to be more realistic than a monolithic one, new calibration on the population models is required.

Keywords

galaxies: evolutionultraviolet: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 56 - 58
Copyright
Copyright © International Astronomical Union 2012

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