25NL, Good AA fold? Was I beat?

[TheOTrain]

Villain is: 34/15/1 (159 hands)
No notes, just the above PT info.

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($47.15)
SB ($14.40)
BB ($23.35)
Hero ($24.90)
MP ($30.85)
CO ($34.75)

Preflop: Hero is UTG with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to $1</font>, MP calls $1, <font color="#666666">4 folds</font>.

Flop: ($2.35) Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $2</font>, MP calls $2.

Turn: ($6.35) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $4</font>, <font color="#CC3333">MP raises to $8</font>, Hero calls $4.

River: ($22.35) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP bets $16</font>, Hero folds.

For me to call the river, I have to have the winning hand more than 42% of the time (is that correct - $16 bet into a $22 pot?).

What does his min-raise on the turn mean?