Existence of a group of 'quiet' quasars confirmed

Aeons ago, the universe was different: mergers of galaxies were common and gigantic black holes with masses equivalent to billions of times that of the Sun formed in their nuclei. As they captured the surrounding gas, these black holes emitted energy. Known as quasars, these very distant and tremendously high energy objects have local relatives with much lower energy whose existence raises numerous questions: are there also such "quiet" quasars at much larger distances? Are the latter dying versions of the former or are they completely different?

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