AA Turn Decision vs. Morongo Unknown

[jester710]

Ok, this is a hand that friend of mine played, and my cousin and I have been arguing as to what the best way to play it would be. Please ignore any decisions that were made during the hand, and give input only on the turn play.

$2/5 NL game. Villain is unknown with a 1k stack, Hero has him covered. Hero has AcAs UTG, raises to $25, five callers to flop. Flop is:

2h 2d 4c [pot is $127]

Hero bets out $100, gets folded around to Villain on the button who smooth calls. Turn is the 4d. What is the correct play to make on the turn?