AQs OTB vs total nut

[bottomset]

UTG is new to the table but has reasonable stats from mining 22/15

CO is a total nutjob 90/50/2 insanely aggressive with just about anything, 3bet pf range is the same as his default open-raise

preflop cap good?
should I be capping the turn here?

Party Poker 5/10 Hold'em (6 max, 6 handed) FTR converter on zerodivide.cx

Preflop: Hero is Button with Q[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">UTG raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">CO 3-bets</font>, <font color="#CC3333">Hero caps</font>, <font color="#666666">2 folds</font>, UTG calls, CO calls.

Flop: (13.40 SB) A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">CO bets</font>, <font color="#CC3333">Hero raises</font>, UTG folds, <font color="#CC3333">CO 3-bets</font>, <font color="#CC3333">Hero caps</font>, CO calls.

Turn: (10.70 BB) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">CO bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">CO 3-bets</font>, Hero calls.

River: (16.70 BB) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">CO bets</font>, Hero calls.

Final Pot: 18.70 BB