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Intrinsic redshifts were proposed by astronomer Halton Arp as a catch-all description for redshifts that are those that are presumed to have not been caused by one of three generally accepted causes (i.e. 1. Cosmological, 2. Doppler and 3. Gravitational). Arp proposed the idea having studied quasars and being a proponent during the controversies about the nature of those objects that they were not as distant as the Hubble Law distances implied. Arp concluded that an additional "intrinsic" component to quasars had to be present due to a physical mechanism other than quasars being distant .

Simultaneous with this, Arp advocates that the Big Bang model of physical cosmology is incorrect. He believes that nonstandard cosmologies are unjustily discriminated against in the astronomical community. One idea he has championed has been Jayant Narlikar's "variable mass" hypothesis which is said to provide for a mechanism for intrinsic redshifts . Arp has promoted his ideas heavily on an internet website and discussion board and has published a number of popular books attacking the astronomical community.

With improved telescopes, the host galaxies for many quasars have been found at the same redshift as the quasars themselves, thus convincing most astronomers that quasars really are the core of distant active galactic nuclei and do not have a significant intrinsic component. Arp continues to maintain that there are discrepancies and "discordant redshifts" observed and does not accept the general consensus due to what he perceives as systemic bias in the scientific community.

References

• Arp, H., Anomalous redshifts in galaxies and quasars (1977)

• Arp, Halton C., Catalogue of discordant redshift associations (2003)

• Narlikar, J. V., Non-Cosmological Redshifts (1977)