$16 Stars: Q9 hits top pair now what?

[BeattysLuck]

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (8 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG+1 (t1310)
MP1 (t2545)
MP2 (t1410)
CO (t1435)
Button (t2520)
SB (t1085)
Hero (t1435)
UTG (t1760)

Preflop: Hero is BB with 9, Q.
1 fold</font>, UTG+1 calls t50, MP1 calls t50, 3 folds</font>, SB completes, Hero checks.

Flop: (t200) 6, 3, 9 (4 players)</font>
SB checks, Hero checks, UTG+1 checks, MP1 bets t400</font>, SB folds, Hero ???

no reads, i usually dont like getting involved in hands unless I hit TPTK, especially in lower blinds like this, hence the check on the flop. Villian bets twice the pot but Im not sure what to think of it. What line should I take here?