SIMBAD references

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.