感謝 is a verb, when you use it in a sentence, you have to say 感謝する or 感謝します ありがとう is served as a noun, I think, that's why they put ございます, the modest expression of です after it. 感謝 is used more often in formal situation like writing. Hope it helps.

感謝する　＝　감사하다 ありがとう　＝　고마워

Oh both Kanji letter from Chinese　"感謝"? Thanks for letting me know! And you're welcome ㅋㅓㅍㅣ

Yes. I have just found out that it exists in lots of Asian languages and they have, if not the same, similar sounds. http://en.wiktionary.org/wiki/%E6%84%9F%E8%AC%9D

I think "感謝" is exactly from Chinese, since they have the same word meaning exactly "thank you"