ATs in sb v limper and 3bet from bb

[btoowhai]

Villain is 37/17/2 after 300 hands.

Full Tilt 3/6 Hold'em (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, CO calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, CO folds, Hero calls.

Flop: (8.50 SB) 3[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, Hero calls.

Turn: (5.25 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, BB checks.

River: (5.25 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>

I understand limited hold them not even a little bit, so I don't know what to do in this likely trivially easy river situation.