Just an Appeal to Authority?
An appeal to a relevant expert can be perfectly appropriate in debate. As long as a person isn't saying that because an authority said so, it is therefore necessarily true, it is not logically fallacious.
Thus, I could appeal to an esteemed biologist's views to support my own notions about biology. On the other hand, appealing to a priest to support my biological notions would be fallacious (unless they are also authorities on biology, of course).
An appeal to a historian in settling an argument about history can be acceptable. Unless there are other historians saying the opposite, for example.
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