nl50 AKs with flushdraw on the flop against raise

[cheups]

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker.com (http://www.leggopoker.com) - Hand History Converter (http://www.leggopoker.com/hh)

UTG: $10.75
MP: $48.25
Hero (CO): $54.15
BTN: $22.50
SB: $71.55
BB: $50

Pre-Flop: A/images/graemlins/heart.gif K/images/graemlins/heart.gif dealt to Hero (CO)
2 folds, <font color="red">Hero raises to $2</font>, BTN calls $2, SB folds, BB calls $1.50

Flop: ($6.25) 5/images/graemlins/club.gif 9/images/graemlins/heart.gif 2/images/graemlins/heart.gif (3 Players)
BB checks, <font color="red">Hero bets $4</font>, BTN calls $4, <font color="red">BB raises to $13</font>, <font color="red">Hero shoves?</font>

[PepsPersson]

Looks fine. I want to get my money in with as much equity as possible and FE. This is a really good spot.

[kylephilly]

Any stats on the BB? Seems to me like he is protecting a nine here. Unless he is a rock I like the shove and hope the A and K are outs as well.

This is a high variance play though.

[cheups]

no reads yet, i think its his first hand. is this a standard play against unknown? would you tend to fold against nitty players here?