Home » News & Blogs » The Kerfuffle Over Non-Cosmological Quasar Redshifts
Bookmark and Share
Ask an Astronomer

The Kerfuffle Over Non-Cosmological Quasar Redshifts

7 Sep 2014, 12:04 UTC
The Kerfuffle Over Non-Cosmological Quasar Redshifts
(200 words excerpt, click title or image to see full post)

Question: Some years ago I read an article that said (if I recall correctly) that there were quasars that seemed to be associated with galaxies (maybe in the center), but the quasar’s much larger red shifts implied that their distance was far more than the associated galaxies’ distances. Has this ever been resolved? – Bill
Answer: The research that you are referring to was done mainly by two astronomers, Halton Arp and Geoffrey Burbidge. They proposed, based on observations of seemingly associated nearby galaxies and purportedly distant quasars, that quasars were simply ejected matter from these galaxies. In fact, once large surveys of galaxies (such as the Sloan Digital Sky Survey), became available it was possible to better test this apparent correlation. In summary, Arp and Burbidge were wrong, their assertion due in fact to what astronomers call a “selection effect”. If you are interested in more details on this now historical discussion see the Galactic Interactions blog post on the subject.
Jeff Mangum

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod