The look-back time evolution of far-ultraviolet flux from the brightest cluster elliptical galaxies at z < 0.2

Chang H. Ree, Young Wook Lee, Sukyoung K. Yi, Suk Jin Yoon, R. Michael Rich, Jean Michel Deharveng, Young Jong Sohn, Sugata Kaviraj, Jonghwan Rhee, Yun Kyeong Sheen, Kevin Schawinski, Soo Chang Rey, Alessandro Boselli, Jaehyon Rhee, José Donas, Mark Seibert, Ted K. Wyder, Tom A. Barlow, Luciana Bianchi, Karl ForsterPeter G. Friedman, Timothy M. Heckman, Barry F. Madore, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. Neff, David Schiminovich, Todd Small, Alex S. Szalay, Barry Y. Welsh

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Abstract

We present the GALEXUV photometry of the elliptical galaxies in Abell clusters at moderate redshifts (z < 0.2) for the study of the look-back time evolution of the UV upturn phenomenon. The brightest elliptical galaxies (M r ≲ - 22) in 12 remote clusters are compared with the nearby giant elliptical galaxies of comparable optical luminosity in the Fornax and Virgo clusters. The sample galaxies presented here appear to be quiescent without signs of massive star formation or strong nuclear activity and show smooth, extended profiles in their UV images, indicating that the far-UV (FUV) light is mostly produced by hot stars in the underlying old stellar population, Compared to their counterparts in nearby clusters, the FUV flux of cluster giant elliptical galaxies at moderate redshifts fades rapidly with ~2 Gyr of look-back time, and the observed pace in FUV - V color evolution agrees reasonably well with the prediction from the population synthesis models where the dominant FUV source is hot horizontal-branch stars and their progeny. A similar amount of color spread (∼1 mag) in FUV - V exists among the brightest cluster elliptical galaxies at z ∼ 0.1, as observed among the nearby giant elliptical galaxies of comparable optical luminosity.

Original languageEnglish
Pages (from-to)607-618
Number of pages12
JournalAstrophysical Journal, Supplement Series
Volume173
Issue number2
DOIs
Publication statusPublished - 2007 Dec 1

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Ree, C. H., Lee, Y. W., Yi, S. K., Yoon, S. J., Rich, R. M., Deharveng, J. M., Sohn, Y. J., Kaviraj, S., Rhee, J., Sheen, Y. K., Schawinski, K., Rey, S. C., Boselli, A., Rhee, J., Donas, J., Seibert, M., Wyder, T. K., Barlow, T. A., Bianchi, L., ... Welsh, B. Y. (2007). The look-back time evolution of far-ultraviolet flux from the brightest cluster elliptical galaxies at z < 0.2. Astrophysical Journal, Supplement Series, 173(2), 607-618. https://doi.org/10.1086/518125