[100NL] Flopped trips against tight

[BlackRabite]

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 5 Players
LeggoPoker.com - Hand History Converter

CO: $235.60
BTN: $192.60
SB: $29
Hero (BB): $235.85
UTG: $101

Pre-Flop: 4[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img] dealt to Hero (BB)
<font color="red">UTG raises to $4</font>, CO folds, BTN calls $4, SB calls $3.50, Hero calls $3

Flop: ($16) 9[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (4 Players)
SB checks, Hero checks, <font color="red">UTG bets $9</font>, 2 folds, Hero calls $9

Turn: ($34) 7[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">UTG bets $23</font>, Hero ?

Small sample, 55 hands. Villain 7.5/13/0.9

What i saw up till now i thought it was an easy fold, but still didn't feel too good about it.