fire the third barrel?

[djoyce003]

No real reads on opponent here. I never reraise AQ out of the blinds..i'm assuming that's debatable but standard for me. I guess I shouldn't say never, i'll do it against perceived steals and hyper-aggro players, but not against unknowns which was the case here. This is about my second orbit at the table.

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) converter

Hero ($47.08)
BB ($25.70)
UTG ($39.05)
MP ($9.95)
Button ($24.50)

Preflop: Hero is SB with A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img]. Hero posts a blind of $0.10.
UTG calls $0.25, <font color="#CC3333">MP raises to $0.75</font>, Button calls $0.75, Hero (poster) calls $0.65, BB calls $0.50, UTG calls $0.50.

Flop: ($3.75) 6[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets $3</font>, BB folds, UTG folds, MP folds, Button calls $3.

Turn: ($9.75) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $9</font>, Button calls $9.

River: ($27.75) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $11.75</font>, Button calls $11.75 (All-In).

Final Pot: $51.25

Should I check/call this river or do you think firing is standard. I bet because i wasn't folding to a bet and I didn't want a check behind...if he hit the flush so be it, I never gave him the odds to chase it. Thoughts?