:::well this is a heavy topic and so it will be long and tedious.  In fact there is more evidence from ancient time that I have not put in here.  Do a google site search for example in www.avesta.org under the word "aryan" and you can see numerous uses in Zoroastrian literatue.  The Europeans were looking for some identity outside of the Judeo-Christianic civilization and thus they tried to claim the historical legacy of Aryans(Indo-Iranians, and modern Indians and Iranians).  So I am not sure why that article on Persian origin is full of disagreements about this term!