Marginal flop decision?

[Bruce D]

Small sample villian is 47/11/0.5

PokerStars 0.10/0.20 Hold'em (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with 4[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, Button calls, <font color="#666666">1 fold</font>, Hero checks.

Flop: (3.50 SB) T[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, Button folds, Hero calls?

I figure villian to have better than a 4 here.