By looking at all of these temps I figure they're:
CPU1 - CPU temp
CPU2 - Northbridge? or faulty sensor? It CAN'T be the processor or any of the cores.
CPU0 Core - unless you have something outside of your PC case or it's cooled by some nice water setup - this is a false reading. Look at your HDD and Mainboard temps, there's no way something inside of your PC will be running 23 degrees without some really nice cooling.