The look-back time evolution of the UV upturn phenomenon

Research output: Contribution to journalArticle

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Abstract

In order to investigate the origin of the far-UV (FUV) flux from early-type galaxies, Galaxy Evolution Explorer (GALEX) is collecting the UV data for the elliptical-rich clusters at moderate redshifts (z < 0.25) where the dominant FUV source is predicted to be hot horizontal-branch (HB) stars and their post-HB progeny. The early results show that the FUV flux of quiescent early-type galaxies does evolve substantially during the last 1-2 Gyr of look-back time, and the observed UV fading is consistent with the variation predicted by the population synthesis models where the mean temperature of HB stars declines rapidly with increasing look-back time.

Original languageEnglish
Pages (from-to)5-12
Number of pages8
JournalBaltic Astronomy
Volume15
Issue number1
Publication statusPublished - 2006 May 18

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horizontal branch stars
galaxies
progeny
hot stars
fading
temperature
synthesis

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "The look-back time evolution of the UV upturn phenomenon",
abstract = "In order to investigate the origin of the far-UV (FUV) flux from early-type galaxies, Galaxy Evolution Explorer (GALEX) is collecting the UV data for the elliptical-rich clusters at moderate redshifts (z < 0.25) where the dominant FUV source is predicted to be hot horizontal-branch (HB) stars and their post-HB progeny. The early results show that the FUV flux of quiescent early-type galaxies does evolve substantially during the last 1-2 Gyr of look-back time, and the observed UV fading is consistent with the variation predicted by the population synthesis models where the mean temperature of HB stars declines rapidly with increasing look-back time.",
author = "Ree, {C. H.} and Lee, {Y. W.} and Sohn, {Y. J.} and Yi, {S. K.} and Yoon, {S. J.}",
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The look-back time evolution of the UV upturn phenomenon. / Ree, C. H.; Lee, Y. W.; Sohn, Y. J.; Yi, S. K.; Yoon, S. J.

In: Baltic Astronomy, Vol. 15, No. 1, 18.05.2006, p. 5-12.

Research output: Contribution to journalArticle

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AU - Ree, C. H.

AU - Lee, Y. W.

AU - Sohn, Y. J.

AU - Yi, S. K.

AU - Yoon, S. J.

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AB - In order to investigate the origin of the far-UV (FUV) flux from early-type galaxies, Galaxy Evolution Explorer (GALEX) is collecting the UV data for the elliptical-rich clusters at moderate redshifts (z < 0.25) where the dominant FUV source is predicted to be hot horizontal-branch (HB) stars and their post-HB progeny. The early results show that the FUV flux of quiescent early-type galaxies does evolve substantially during the last 1-2 Gyr of look-back time, and the observed UV fading is consistent with the variation predicted by the population synthesis models where the mean temperature of HB stars declines rapidly with increasing look-back time.

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