Observational tests for ultraviolet sources in elliptical galaxies

Sukyoung Yi, Ehsan Afshar, Pierre Demarque, Augustus Oemler

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

An understanding of the empirical correlation between the strength of the UV upturn and the metallicity of luminous elliptical galaxies (Burstein and coworkers) is vital in the study of the evolution of elliptical galaxies. We support a modestly old (15-20 Gyr), metal-rich hypothesis ([Fe/H] 5 0) for the UV sources in UV upturn galaxies as an alternative to the old (520 Gyr), metal-poor ([Fe/H] = —1.0) hypothesis of Park Lee. This preliminary result of our population synthesis is based on a Gaussian mass distribution on the horizontal branch and a complete library of stellar evolution tracks, both of which are crucial in producing UV light in the metal-rich systems. The metal-rich hypothesis has an advantage over the metal-poor one not only because it explains the UV upturn-metallicity relation but also because it requires neither an uncomfortably large age nor a large age span for elliptical galaxies. We suggest several observational tests to constrain the metallicity of the UV sources. Subject headings: Galaxies: Elliptical and lenticular, cD — galaxies: evolution — ultraviolet: galaxies.

Original languageEnglish
Pages (from-to)L69-L72
JournalAstrophysical Journal
Volume453
Issue number2
DOIs
Publication statusPublished - 1995 Nov 10

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this