Redshift quantization, also referred to as redshift periodicity, redshift discretization, preferred redshifts and redshift-magnitude bands, is the hypothesis that the redshifts of cosmologically distant objects (in particular galaxies and quasars) tend to cluster around multiples of some particular value.
In standard inflationary cosmological models, the redshift of cosmological bodies is ascribed to the expansion of the universe, with greater redshift indicating greater cosmic distance from the Earth (see Hubble's Law). This is referred to as cosmological redshift. Ruling out errors in measurement or analysis, quantized redshift of cosmological objects would either indicate that they are physically arranged in a quantized pattern around the Earth, or that there is an unknown mechanism for redshift unrelated to cosmic expansion, referred to as "intrinsic redshift" or "non-cosmological redshift".
In 1973, astronomer William G. Tifft was the first to report evidence of this pattern. Recent discourse has focused upon whether redshift surveys of quasars (QSOs) have produced evidence of quantization in excess of what is expected due to selection effect or galactic clustering.
Some scientists who espouse nonstandard cosmological models, including those who reject the Big Bang theory, have referred to evidence of redshift quantization as reason to reject conventional accounts of the origin and evolution of the universe.
Redshift quantization is a controversial topic considered to be in the fringes of modern astronomy. Though the idea is generally discounted by the large majority of astronomers, peer-reviewed publications and discourse on the topic still continue to the present day.
Original investigation by William G. TifftEdit
- "Using more than 200 redshifts in Coma, Perseus, and A2199, the presence of a distinct band-related periodicity in redshifts is indicated. Finally, a new sample of accurate redshifts of bright Coma galaxies on a single band is presented, which shows a strong redshift periodicity of 220 km s−1. An upper limit of 20 km s−1 is placed on the internal Doppler redshift component of motion in the Coma cluster".
Tifft, now Professor Emeritus at the University of Arizona, suggested that this observation conflicted with standard cosmological scenarios. He states in summary:
- "Throughout the development of the program it has seemed increasingly clear that the redshift has properties inconsistent with a simple velocity and/or cosmic scale change interpretation. Various implications have been pointed out from time to time, but basically the work is observationally driven."
Studies performed in the 1980s and early 1990s produced confirmatory results:
- In 1989, Martin R. Croasdale reported finding a quantization of redshifts using a different sample of galaxies in increments of 72 km/s or Δz = 2.4×10−4 (where Δz denotes shift in frequency expressed as a proportion of initial frequency).
- In 1990, Bruce Guthrie and William Napier reported finding a "possible periodicity" of the same magnitude for a slightly larger data set limited to bright spiral galaxies and excluding other types.
- In 1992, Guthrie and Napier proposed the observation of a different periodicity in increments of Δz = 1.24×10−4 in a sample of 89 galaxies.
- In 1992, Paal et al. and Holba et al. concluded that there was an unexplained periodicity of redshifts in a reanalysis of a large sample of galaxies.
- In 1997, Guthrie and Napier concluded the same:
- "So far the redshifts of over 250 galaxies with high-precision HI profiles have been used in the study. In consistently selected sub-samples of the datasets of sufficient precision examined so far, the redshift distribution has been found to be strongly quantized in the galactocentric frame of reference. ... The formal confidence levels associated with these results are extremely high."
Most recent discourse has focused upon whether redshift surveys of quasars (QSOs) produce evidence of quantization beyond that explainable by selection effect. This has been assisted by advances in cataloging in the late 1990s that have increased substantially the sample sizes involved in astronomical measurements.
- refers to the magnitude of redshift (shift in frequency as a proportion of initial frequency).
- is an integer with values 1, 2, 3, 4 ...
A 2001 study by Burbidge and Napier found the pattern of periodicity predicted by Karlsson's formula to be present at a high confidence level in three new samples of quasars, concluding that their findings are inexplicable by spectroscopic or similar selection effects.
In 2002, Hawkins et al. found no evidence for redshift quantization in a sample of 1647 galaxy-quasar pairs from the 2dF Galaxy Redshift Survey:
- "Given that there are almost eight times as many data points in this sample as in the previous analysis by Burbidge & Napier (2001), we must conclude that the previous detection of a periodic signal arose from the combination of noise and the effects of the window function."
In response, Napier and Burbidge (2003) argue that the methods employed by Hawkins et al. to remove noise from their samples amount to "excessive data smoothing" which could hide a true periodicity. They publish an alternate methodology for this that preserves the periodicity observed in earlier studies.
Arp et al. (2005) examined sample areas in the 2dF and SDSS surveys in detail, noting that quasar redshifts:
- "... fit very closely the long standing Karlsson formula and strongly suggest the existence of preferred values in the distribution of quasar redshifts."
A 2006 study of 46,400 quasars in the SDSS by Bell and McDiarmid discovered 6 peaks in the redshift distribution consistent with the decreasing intrinsic redshift (DIR) model. They conclude that this correlation is unlikely to be a selection effect, given the method used to determine intrinsic redshift relations.
Schneider et al. (2007) and Richards et al. (2006) report that the periodicity reported by Bell and McDiarmid disappears after correcting for selection effects. However, Bell and Comeau (2010) have since argued that this correction removes nearly half of the sample and does not explain how selection effects give rise to redshift peaks. The same study also concludes that a "filter gap footprint" renders it impossible to verify or falsify the presence of a true redshift peak at Δz = 0.60.
A 2006 review by Bajan et al. discovered weak effects of redshift periodization in data from the Local Group of galaxies and the Hercules Supercluster. They conclude that "galaxy redshift periodization is an effect which can really exist", but that the evidence is not well established pending study of larger databases.
A 2007 absorption spectroscopic analysis of quasars by Ryabinkov et al. observed a pattern of statistically significant alternating peaks and dips in the redshift range Δz = 0.0 − 3.7, though they noted no statistical correlation between their findings and Karlsson's formula.
In 2019, Karlsson's formula was applied to show that redshifts result from a Stimulated Raman Loss (SRL) of frequencies of light propagating in 2P state atomic hydrogen, so that Hubble's rule does not evaluate distances but column density of H in state 2P <ref>https://hal.archives-ouvertes.fr/hal-02184296<\ref>. Thus, there is no need to introduce dark matter: As spiral galaxies contain a lot of hot stars, which excite H atom, their distances are over-evaluated. Thus their sizes must be reduced, so that they are stable without dark matter.
- Tifft, W. G. (2006). "Redshift periodicities, The Galaxy-Quasar Connection". Astrophysics and Space Science. 285 (2): 429–449. Bibcode:2003Ap&SS.285..429T. doi:10.1023/A:1025457030279.
- Karlsson, K. G. (1970). "Possible Discretization of Quasar Redshifts". Astronomy and Astrophysics. 13: 333. Bibcode:1971A&A....13..333K.
- Arp, H.; Russel, D. (2001). "A Possible Relationship between Quasars and Clusters of Galaxies". Astrophysical Journal. 549 (2): 802. Bibcode:2001ApJ...549..802A. doi:10.1086/319438.
The clusters and the galaxies in them tend to be strong X-ray and radio emitters, and their redshifts occur at preferred redshift values.
- Tifft, W. G. (1973). "Properties of the redshift-magnitude bands in the Coma cluster". Astrophysical Journal. 179: 29. Bibcode:1973ApJ...179...29T. doi:10.1086/151844.
- Nanni, D.; Pittella, G.; Trevese, D.; Vignato, A. (1981). "An analysis of the redshift-magnitude band phenomenon in the Coma Cluster". Astronomy and Astrophysics. 95 (1): 188. Bibcode:1981A&A....95..188N.
- Trimble, V.; Aschwanden, M. J.; Hansen, C. J. (2007). "Astrophysics in 2006". Space Science Reviews. 132 (1): 1–182. arXiv:0705.1730. Bibcode:2007SSRv..132....1T. doi:10.1007/s11214-007-9224-0.
- Bell, M. B.; McDiarmid, D. (2006). "Six Peaks Visible in the Redshift Distribution of 46,400 SDSS Quasars Agree with the Preferred Redshifts Predicted by the Decreasing Intrinsic Redshift Model". Astrophysical Journal. 648 (1): 140–147. arXiv:astro-ph/0603169. Bibcode:2006ApJ...648..140B. doi:10.1086/503792.
- Godłowski, W.; Bajan, K.; Flin, P. (2006). "Weak redshift discretisation in the Local Group of galaxies?". Astronomische Nachrichten. 387 (1): 103. arXiv:astro-ph/0511260. Bibcode:2006AN....327..103G. doi:10.1002/asna.200510477.
- Tang, S. M.; Zhang, S. N. (2005). "Critical Examinations of QSO Redshift Periodicities and Associations with Galaxies in Sloan Digital Sky Survey Data". Astrophysical Journal. 633 (1): 41–51. arXiv:astro-ph/0506366. Bibcode:2005ApJ...633...41T. doi:10.1086/432754.
- For examples, see references by nonstandard cosmology proponents
- Ratcliffe, Hilton (2009). "A Review of Anomalous Redshift Data". 2nd Crisis in Cosmology Conference, CCC-2 ASP Conference Series. 413: 109. Bibcode:2009ASPC..413..109R.
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- Laviolette, P. A. (1986). "Is the universe really expanding?". The Astrophysical Journal. 301: 544. Bibcode:1986ApJ...301..544L. doi:10.1086/163922.
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- Arp, H. (1998). "Quantization of Redshifts". Seeing Red. ISBN 978-0-9683689-0-9. Archived from the original on 2006-10-20. Cite uses deprecated parameter
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- Babu, G. Jogesh; Feigelson, Eric D. (1996). Astrostatistics. p. 183. ISBN 978-0412983917.
- Tifft, W. G. (1980). "Periodicity in the redshift intervals for double galaxies". Astrophysical Journal. 236: 70. Bibcode:1980ApJ...236...70T. doi:10.1086/157719.
- Tifft, W. G. (1974). Shakeshaft, J. R (ed.). "Fine Structure Within the Redshift-Magnitude Correlation for Galaxies". Proceedings of the 58th IAU Symposium: The Formation and Dynamics of Galaxies. 58: 255–256. Bibcode:1974IAUS...58..243T.
- Tifft, W .G. (1995). "Redshift Quantization - A Review". Astrophysics and Space Science. 227 (1–2): 25–39. Bibcode:1995Ap&SS.227...25T. doi:10.1007/BF00678064.
- Croasdale, Martin R. (1989). "Periodicities in galaxy redshifts". The Astrophysical Journal. 345: 72. Bibcode:1989ApJ...345...72C. doi:10.1086/167882.
- Guthrie, B. N. G.; Napier, W. M. (1990). "The Virgo cluster as a test for quantization of extragalactic redshifts". Monthly Notices of the Royal Astronomical Society. 243: 431–442. Bibcode:1990MNRAS.243..431G.
- Guthrie, B. N. G.; Napier, W. M. (1991). "Evidence for redshift periodicity in nearby field galaxies". Monthly Notices of the Royal Astronomical Society. 253 (3): 533–544. Bibcode:1991MNRAS.253..533G. doi:10.1093/mnras/253.3.533.
- Paal, G. (1992). "Inflation and compactification from Galaxy redshifts?". Astrophysics and Space Science. 191 (1): 107–124. Bibcode:1992Ap&SS.191..107P. doi:10.1007/BF00644200.
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- Karlsson, K. G. (1990). "Quasar redshifts and nearby galaxies". Astron Astrophys. 239: 50. Bibcode:1990A&A...239...50K.
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- Hawkins; Maddox; Merrifield (2002). "No Periodicities in 2dF Redshift Survey Data". Monthly Notices of the Royal Astronomical Society. 336 (13): L13–L16. arXiv:astro-ph/0208117. Bibcode:2002MNRAS.336L..13H. doi:10.1046/j.1365-8711.2002.05940.x.
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