Notability 

Hi there; you have unerringly selected one of the really hot potatoes within wikipedia; how to assess or define notability. There is no consensus, though you way like to read through, and if you wish contribute to, the current debate in WP:PUMP (policy section). Essentially, while some topics (e.g. my cat is called Spike) are obviously not notable, and some (e.g. George W Bush) clearly are, there is a middle ground which is not always clear. And this is at the mercy of the subjective assessment of the editing community. There is NO authoritative source from which you can derive definitive on this.