Greetings. I'm am writing a paper on Lord Ayyappa and his birth from the union of Vishnu as Mohini and Shiva. I am wondering if anyone knows where I can find accounts of his birth and subsequent acts in scripture? I am trying to trace the origins of the story, so I am also wondering if any can point me to anything authoritative about that. I have read the account of the union of Mohini and Shiva in the Bhagavata and Brahmanda puranas, but I have not found anything describing the birth of Ayyappa or of his subsequent acts (e.g. vanquishing of Mahishi) other than in colloquial recountings of the story in websites or some current books (without reference to the history or source).
Thank you very much.