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Unformatted text preview: Alternate Approaches and the Redshift Controversy (This section also available in Belorussian translation prepared by Jason Fragoso!) Much of our understanding of the physics of AGN depends on knowing their absolute properties (luminosities, size scales) and thus their distances. There is a small but vocal school which claims that much of the redshift of QSOs (at least) arises not in the Hubble flow but in exotic physical processes, and thus that redshift distances to (some?) QSOs are nonsense. This point of view has been defended in Arp's book ( Quasars, Redshifts, and Controversies , Interstellar Media, Berkeley, later joined by Seeing Red: Redshifts, Cosmology and Academic Science ), with some of his best cases. The observational suspicion that some AGN might be at noncosmological distances seems to have first arisen when Arp (1967 ApJ 146, 321) noted an association between several low- redshift peculiar galaxies and quasars in a rough pairing sense, with pairs of QSOs on each side...
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- Fall '10