The UV upturn phenomenon in the hierarchical universe

Jaehyun Lee; Sukyoung K. Yi

doi:10.1017/S1743921312008733

The UV upturn phenomenon in the hierarchical universe

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

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.

Original language	English
Title of host publication	The Spectral Energy Distribution of Galaxies
Editors	Richard J. Tuffs, Cristina C. Popescu
Pages	56-58
Number of pages	3
Edition	S284
DOIs	https://doi.org/10.1017/S1743921312008733
Publication status	Published - 2011 Sept

Publication series

Name	Proceedings of the International Astronomical Union
Number	S284
Volume	7
ISSN (Print)	1743-9213
ISSN (Electronic)	1743-9221

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1017/S1743921312008733

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title = "The UV upturn phenomenon in the hierarchical universe",

abstract = "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.",

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AB - 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.

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The UV upturn phenomenon in the hierarchical universe

Abstract

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