$55 Lvl3: Tptk but BB overbets pot on scary flop. Call,raise,fold?

[AA suited]

no reads, 8 players left, all ~1250 chips. You and villian have exactly 1250 chips.

Hero in MP with A [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/spade.gif[/img]
Folded to Hero, who bets 3BB (150). Folded to BB, who calls.

Flop (pot=325): 9 [img]/images/graemlins/spade.gif[/img] T [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/diamond.gif[/img]
BB bets 500. Hero ??? [img]/images/graemlins/confused.gif[/img]

BB bet almost 1/2 his stack, leaving him with 600 chips.
You have tptk with backdoor straight and flush draws.

Call, push, fold?

And WHY? [img]/images/graemlins/confused.gif[/img]