I may be missing something obvious but I do not see anywhere in the Pathfinder books that explain how an aura works in general.
Do auras trespass line of sight?
Do they trespass line of effect?
Do they circle around walls and obstacles?
Do auras shut down when the creature falls unconscious?
Do they shut down when the creature dies?
The question came particularly during a combat with a Seugathi, but many other monsters have auras that leave a lot to manual judgement.