The UV upturn phenomenon in the hierarchical universe

Jaehyun Lee, Sukyoung K. Yi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 languageEnglish
Title of host publicationThe Spectral Energy Distribution of Galaxies
EditorsRichard J. Tuffs, Cristina C. Popescu
Number of pages3
Publication statusPublished - 2011 Sept

Publication series

NameProceedings of the International Astronomical Union
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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