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Date and Time of the Query: 2019-07-18 T21:04:06 PDT
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For refcode 2005ApJ...619L.103L:
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Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...619L.103L The Look-back Time Evolution of Far-Ultraviolet Flux from Elliptical Galaxies: The Fornax Cluster and A2670 Young-Wook Lee, Chang H. Ree, R. Michael Rich, Jean-Michel Deharveng, Young-Jong Sohn, Soo-Chang Rey, Sukyoung K. Yi, Suk-Jin Yoon, Luciana Bianchi, Jae-Woo Lee, Mark Seibert, Tom A. Barlow, Yong-Ik Byun, Jose Donas, Karl Forster, Peter G. Friedman, Timothy M. Heckman, Myungkook J. Jee, Patrick N. Jelinsky, Sug-Whan Kim, Barry F. Madore, Roger F. Malina, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. Neff, Jaehyon Rhee, David Schiminovich, Oswald H. W. Siegmund, Todd Small, Alex S. Szalay, Barry Y. Welsh, and Ted K. Wyder Abstract. In order to investigate the origin of the far-UV (FUV) flux from the early-type galaxies, the Galaxy Evolution Explorer is collecting the UV data for the elliptical-rich clusters at moderate redshifts (z<0.2) where the dominant FUV source is predicted to be hot horizontal-branch (HB) stars and their post-HB progeny. Here we present our first result for the early-type galaxies in A2670 at z=0.076. Compared to NGC 1399, a nearby giant elliptical galaxy in the Fornax Cluster, it appears that the rest-frame FUV-V color of the giant elliptical galaxies gets redder by ~0.7 mag at the distance of A2670 (z=0.076; look-back time~1.0 Gyr). Although a detailed comparison with the models is postponed until more cluster data are accumulated, it is interesting to note that this value 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. Keywords: Galaxies: Evolution, Galaxies: Stellar Content, Ultraviolet: Galaxies
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