QQ with ace flopped?

[gezuz]

Yo, I'm curious as to what others at these limits do when an ace flops with 99+ pairs that have 4 players or so. I figured because I'm acting first I would check and fold to a bet. With no reads, is this the right play? I figered the LP bettor would have bet a Ace or 9 on the flop, which is why I called on the turn, but probably would have folded to a river bet because it completed bd flush and overcard. With no reads on a .5/1 table, do people usually bet in my position? Should I raise the turn bet?

Party Poker 0.50/1.00 Hold'em <font color="#0000FF">(10 handed)</font> link

Preflop: Hero is BB with Q[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls, <font color="#666666">2 folds</font>, CO calls, Button calls, <font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises</font>, MP1 calls, CO calls, Button calls.

Flop: (8.50 SB) A[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, MP1 checks, CO checks, Button checks.

Turn: (4.25 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, MP1 checks, <font color="#CC3333">CO bets</font>, Button folds, Hero calls, MP1 folds.

River: (6.25 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO checks.

Final Pot: 6.25 BB.

all input appreciated, thanks.