I can understand both sides of the coin here (which strengthens the point I made in another thread that there is no right or wrong way to play a hand).

I personally would have bet the turn as well putting him on a weaker ace. We see medium pocket pairs call your flop bet as well...but being that we see weaker aces a larger percent of the time, a turn bet seems profitable.

As the hand is played, isn't the river bet exactly (well not exactly) what we wanted from the check you made on the turn? He thinks his AT or AJ (and even possibly a split pot with AQ) is good and is looking to gain some value. I do not see him calling preflop with A6+. I agree with calling here and looking him up.