| Issue |
A&A
Volume 701, September 2025
|
|
|---|---|---|
| Article Number | A256 | |
| Number of page(s) | 3 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/202555988 | |
| Published online | 18 September 2025 | |
Redshift ∼2.7 is not special
Comment on the Kolmogorov analysis of JWST deep survey galaxies
Indian Institute of Astrophysics, Bangalore 560034, India
⋆ Corresponding author: prajwel.pj@gmail.com
Received:
17
June
2025
Accepted:
17
July
2025
Galikyan et al. (2025, A&A, 696, L21) reported a statistically significant change in galaxy spectral properties at redshift z ≃ 2.7 based on a Kolmogorov Stochasticity Parameter analysis of JWST spectroscopic data of galaxies. In this comment, we demonstrate that this result is critically driven by a single outlier in the dataset that was employed. This outlier arises from the use of a questionable redshift estimate for one spectrum. When the outlier is removed or the redshift is corrected, the claimed transition at z ≃ 2.7 disappears entirely. By independently reproducing the previous analysis, we demonstrate that the claimed feature is not a robust statistical signal, but an artefact of this anomalous data point.
Key words: methods: data analysis / methods: statistical / galaxies: high-redshift
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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