AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies
Alberto Buzzoni (1), Rosa A. Gonzalez-Lopezlira (2) ((1) INAF -, Osservatorio Astr. di Bologna, Italy, (2) CRyA UNAM, Morelia, Mexico)
TL;DR
This paper investigates the ultraviolet excess in elliptical galaxies, linking it to changes in stellar populations and evolution, especially the hot horizontal branch stars and red giants, using infrared surface brightness fluctuations.
Contribution
It reveals that the UV-upturn phenomenon indicates significant shifts in stellar population characteristics, involving both hot stars and red-giant evolution, based on infrared fluctuation analysis.
Findings
UV-upturn signals changes in stellar population diagrams.
Hot horizontal branch stars contribute to UV excess.
Red-giant evolution is also involved.
Abstract
Relying on infrared surface brightness fluctuactions to trace AGB properties in a sample of elliptical galaxies in the Virgo and Fornax clusters, we assess the puzzling origin of the "UV-upturn" phenomenon, recently traced down to the presence of a hot horizontal branch stellar component. We find that the UV-upturn actually signals a profound change in the c-m diagram of stellar populations in elliptical galaxies, involving both the hot stellar component and red-giant evolution.
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