I know the verb 있다, but what does 있네요 and 있지요 mean?

Is 여기 a particle? I have a book that has 여기에 in it but I'm having trouble with the translation. Google says it means 'here', but I can't find it in any dictionaries. 여기에 속하다 means to belong here, but what about sentences like 여기 실뭉치가 있어요 or 아기 고양이가 여가에 있어요? Thanks in advance.