The UV Upturn in Elliptical Galaxies as an Age Indicator

Abstract

We show that the UV flux of old stellar systems can tell us about their ages. Two independent populations synthesis groups that have had wildly different views have here worked together and generated two solutions that can be easily tested using space telescopes. Proposed tests will constrain the ages of giant Es, that are often considered the oldest populations in the universe, and thus cosmology.

LaTeX and 11 eps figures Accepted for publication in ApJ

References in corpus (13)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• LBDS 53W091: An Old red Galaxy at z=1.552
• Ages of Globular Clusters from Hipparcos Parallaxes of Local Subdwarfs
• The Age Of Globular Clusters In Light Of Hipparcos: Resolving the Age Problem?
• Younger and brighter - New distances to globular clusters based on Hipparcos parallax measurements of local subdwarfs
• A Far Ultraviolet Analysis of the Stellar Populations in Six Elliptical and S0 Galaxies
• On the Origin of the UV Upturn in Elliptical Galaxies. I. Sensitivity of UV Population Synthesis to Various Input Parameters
• Color--Luminosity Relations for the Resolved Hot Stellar Populations in the Centers of M 31 and M 32
• On the UV Bright Phase of Metal-Rich Horizontal-Branch Stars
• On the Origin of the UV Upturn in Elliptical Galaxies. II. Test of the HB Hypothesis
• Peculiar Multimodality on the Horizontal Branch of the Globular Cluster NGC 2808
• Infall Models of Elliptical Galaxies: Further Evidence for a Top-Heavy Initial Mass Function
• Old high-redshift galaxies and primordial density fluctuation spectra

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• Ultraviolet Properties of Primeval Galaxies: Theoretical Models from Stellar Population Synthesis
• Hot Populations in M87 Globular Clusters
• The Panchromatic Hubble Andromeda Treasury I: Bright UV Stars in the Bulge of M31
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• Age and Abundance Discrimination in Old Stellar Populations Using Mid-Ultraviolet Colors
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• Extremely Red Objects in the Field of QSO 1213-0017: A Galaxy Concentration at z=1.31
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• UV Upturn in Elliptical Galaxies: Theory
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