Hi VKR, You made me to go through ninth chapter of Rgveda, but its ok to put some efforts to validate a statement. I have Rgveda published by Sanskriti Prakashan, Barelly and as per that ninth chapter comprises of sukta/sloka 44-50. In these six suktas, I did not find a single word which could mean Arya.
You need to tell what exactly you mean by 'Rg-veda ix' as many of the books refer chapters differently. Hence if you can tell exact sukta then I can check that in my book and give details on that. Till then its like finding a needle in haystack.
One more thing I want to say that please do not accept whatever is written on web till you validate this from your end. You, its people like us who are writing on web and there can be many mistakes in those statements. Hence please validate first or ask for help in validation before accepting any of the web reference.