Likely dominated AXs in a 3 way unraised pot

[jediael]

No reads on any player

Party Poker 3/6 Hold'em (10 handed) converter

Preflop: Hero is BB with 6[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img]. UTG+2 posts a blind of $1.
UTG calls, <font color="#666666">1 fold</font>, UTG+2 (poster) checks, <font color="#666666">3 folds</font>, CO calls, <font color="#666666">2 folds</font>, Hero checks.

Flop: (4.50 SB) 3[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, <font color="#CC3333">UTG+2 raises</font>, CO folds, Hero calls, UTG calls.

Turn: (5.25 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero ????


My idea: check the turn and raise a bet from UTG+2 to knock out UTG and as a semi-bluff, representing a 3, to maybe push UTG+2 off a better hand if he does indeed have one.