Evolution of the Ultraviolet Upturn at $0.3<z<1$: exploring helium rich stellar populations

S. S. Ali, R. De Propris, C. Chung +2

We measure the near-UV (rest-frame $\sim 2400$Å) to optical color for early-type galaxies in 12 clusters at $0.3<z<1.0$. We show that this is a suitable proxy for the more comm…