AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies

Details AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies

2008-06-16

arxiv.org/abs/0806.2658v1

Astronomy and Astrophysics

Astrophysics

13 pages & 13 figures -- To appear in the Astrophysical Journal (Sep '08 issue). Further info on SBF models at http://www.bo

Scientific paper

10.1086/589984

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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