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I'm not talking about the camera settings, but when you reduced it to post on the forum, it has been compressed pretty hard down to 23k.
Did the camera sit there for 2 minutes after your 2 minute exposure? That's the only real way it can do noise reduction, but closing the shutter and taking an equivalent length dark frame, and subtracting that from the exposed shot.
It means your camera is tied up for 2 minutes after the first 2 minutes.
You should put the lens cap on and take a 2 minute shot next time, and post the 2 images, and we'll see if we can subtract them.
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