(Proposal ID) S15A-040

(PI) Hayashi, Masao

(Proposal Title)
 Direct verification of AGN feedback in active radio galaxies at z~2.5

(Abstract)
We propose an integral field spectroscopy of two high-z radio galaxies (HzRG) 
at z~2.5 with NIFS on the Gemini-N Telescope. These are being active at z~2.5, 
but are secure progenitors of massive quiescent galaxies in the local Universe.
 The close relationship between the extended Halpha emission discovered by our 
narrow-band imaging and the radio activity suggests that an AGN feedback is 
actually being at work in these HzRGs. Feedback by an AGN is considered to be 
one of the critical processes that regulate galaxy evolution, as suggested not 
only by theoretical studies but also by observational data. However, the 
details are largely unexplored yet. How and to what degree does an AGN 
influence the star formation and the physical state of interstellar gas of 
the hosting galaxies? Up to now, almost all the studies on the feedback have 
been relying on indirect evidences, but we now aim to directly verify whether 
an AGN gives negative/positive feedback to the host galaxies leading to 
quenching/enhancement of star forming activities. We reveal the kinematics 
and physical states of the associated nebular gas on a 1.6-3.2 kpc scale 
and investigate the mutual relation between star formation, outflows, and 
shocks within the galaxies.