The Look-back Time Evolution of Far-Ultraviolet Flux from Elliptical Galaxies: The Fornax Cluster and A2670
- Lee, Y.-W.
- Ree, C. H.
- Rich, R. M.L
- Deharveng, J.-M.
- Sohn, Young-J.
- Rey, S.-C.
- Yi, S. K.
- Yoon, S.-J.
- Bianchi, L.
- Lee, J.-W.
- Donas, José
- Malina, R.
- Martin, D. C.
- Milliard, B.
- Morrissey, P.
- Neff, Susan Gale
- Rhee, J.
- Schiminovich, David
- Siegmund, O.H. W.
- Small, Todd
- Szalay, Alex
- Welsh, B.Y.
- Wyder, Ted
DOIAbstract
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 inter...