[Alobar]

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For the most part people don't check behind on the turn without an intent to get to showdown after showing that much agression.

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he couldnt have checked behind the turn because he either gave up, or wanted the free card with his AJs (thats a really narrow range for hands you beat BTW) but intends to fold the river because on that board there isnt much you would be holding that he beats? If hes got AJ you have to have pretty much exactly AT for him to want to call, and even if hes got 77, I dont think he calls here alot, if hes half way observant he knows you didnt call that flop with AJ or AT, and any other hand excet for manybe 66 got there.