Confused with AA hand

[grjr]

No reads. Villain had just sat down.

What do you do on the turn?

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, MP1 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, Button calls, SB calls, BB calls, UTG+2 calls, MP1 calls.

Flop: (12 SB) J[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG+2 bets</font>, MP1 folds, <font color="#CC3333">Hero raises</font>, Button folds, SB folds, BB calls, UTG+2 calls.

Turn: (9 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">UTG+2 bets</font>, Hero ???