(Proposal ID) S13A-047

(PI) Daddi, Emanuele

(Proposal Title)
Environmental effects on SFR, AGN and metals in a z = 2 galaxy cluster

(Abstract)
We have performed the deepest HST+WFC3 spectroscopic survey in the field of 
the evolved z=2 galaxy cluster Cl J1449+0856, obtaining reliable [OIII]+H beta 
detections of 68 galaxies, of which 25% belong to the cluster structure. We 
propose to follow up all these galaxies with Subaru+MOIRCS in order to measure 
also their H alpha +[NII] lines, not accessible from the HST grism data. This 
will allow us to place all galaxies in the BPT diagram, distinguishing AGNs 
and star forming galaxies, and accurately derive metallicity, SFR and 
reddening for the latter. We will thus be able to perform the first detailed 
study of the effect of cluster environments on the AGN and SF activity of 
galaxies, as well as metal enrichment history, at large unprecedented 
redshifts. Our z = 2 cluster is both evolved, with detectable X-ray emission 
and strong overdensity of passive ellipticals, but also young and still 
forming, as shown by significant AGN/SF/merging activity, making it an ideal 
place to carry out this study.