50NL trouble with AK. Fold TPTK?

[mWired]

Party Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Pre-flop: (6 players) Hero is UTG+1 with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
UTG folds, <font color="#cc0000">Hero raises to $2</font>, CO calls, Button calls, 2 folds.

Flop: 6[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/heart.gif[/img] ($6.75, 3 players)
<font color="#cc0000">Hero bets $4</font>, CO folds, <font color="#cc0000">Button raises to $18</font>.

Hero ???

villain 53/31/9 after 100 hands
me 30/22 after 100 hands

edit: I have $50, villain covers

[Imrahil]

I push here.

[jimpo]

I don't think calling will accomplish anything since turn will most likely not help us make any better decisions. Villain is aggressive, we are out of position, so it is almost certain that he will bet there, and we cannot get any new information from his bet. There are not many cards (3) that will make our hand much better on the turn, and there are a lot of hands (hearts) that will make our hand fly to muck. If we continue with this hand, calling is out of question.

And folding is too weak against this aggressive opponent. I think I would push too.