HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4

We present results from NICMOS Hubble Space Telescope observations of the r eddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Ter zan 4, obtained through the filters F110W (1.1 mum) and F160W (1.6 mum) (ne arly equivalent to J and H). For the first time the turnoff region of Lille r 1 and the main sequence of Terzan 5 and Terzan 4 are reached, as well as the horizontal branch of UKS 1. The magnitude difference between the turnof f and the red horizontal branch Deltam(110) = m(110)(HB)- m(110)(TO) is use d as an age indicator. From comparisons with new isochrones in the NICMOS p hotometric system, we conclude that the two metal-rich clusters NGC 6528 an d Terzan 5 are coeval within uncertainties (similar to 20%) with 47 Tucanae . Liller 1 and UKS 1 are confirmed as metal-rich globular clusters. Terzan 4 is confirmed as an interesting case of a metal-poor cluster in the bulge with a blue horizontal branch.