The phrase "authentic aspect" is correct and usable in written English.
It can be used when discussing a genuine or true characteristic of something, often in contexts related to art, culture, or identity.
Example: "The film captures the authentic aspect of rural life, showcasing the traditions and values of the community."
Alternatives: "genuine facet" or "true characteristic".
They felt more understood when their health care providers shared some "authentic" aspect of themselves.
The most authentic aspect of a liberal arts college is the people.
On the contrary, it's the artistic and authentic aspect of ourselves that brings out the best of our work.
Now that the authentic aspect of the tradition threatens to disappear because of the interference of mainlanders and snooping foreigners (like us) and simplicity of making and spreading today's media, we understand the paranoia and fear of the islanders.
The depth of a complex work that deals with horrific but authentic aspects of life is sometimes found in the artists' personal implications in those parts of life.
Disappointed by the extent to which French colonization had actually corrupted Tahiti, he attempted to immerse himself in what he believed were the authentic aspects of the culture.
Talents exist naturally and are authentic aspects of individual uniqueness.
As I did some soul searching I realized that working in finance wasn't enabling me to tap into my creative side and directly help others, which were both authentic aspects of who I am.
Parts and wholes are both authentic aspects of being; independent and dependent entities are similarly aspects of being; physical, biological, psychological and spiritual types of being are all manifestations of being, and none of them is "more being" than any other.
But approving of a trait is also problematic as a requirement of autonomy, for there are many perfectly authentic aspects of myself (ones for which I can and should be held fully responsible for example) which I do not fully approve of.
Oddly enough this may be the most authentic, realistic aspect of Mr. Carter's novel.
