Cluster gravitational redshifts: uncertainties and survey requirements

Clicks: 1
ID: 315876
2026
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal

Ranked #632 of 900 articles by views in monthly notices of the royal astronomical society

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 900 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Abstract We investigate the impact of observational and modelling uncertainties in cluster gravitational redshifts as a probe of modified gravity using an end-to-end forecasting pipeline. We use a generative model to build a halo catalogue with M500 ≥ 3 × 1013 M⊙, populate haloes with member galaxies via a five-parameter halo occupation distribution (HOD), assign projected positions from radial density profiles, apply survey-like selections, and infer a linear rescaling of the gravitational potential, αMG, to parameterise modifications to general relativity (GR). We vary redshift uncertainties, radial and mass–redshift completeness, member abundance, minimum mass and maximum redshift, as well as mis-specify the clusters density and velocity profiles, centres, and mass function. We find that the intracluster velocity dispersion sets an effective floor: improving redshift precision beyond σz ~ 10−4(1 + z) brings no improvement in the precision of αMG. Realistic redshift and mass cuts primarily remove low-mass haloes and have minimal impact on the αMG precision. In this setting, we find that shallow, narrower spectroscopic surveys are preferable to deep, wide photometric ones for precise constraints on αMG. We further find that mis-centring can mimic significant departures from GR. Baryonic deviations from a Navarro-Frenk-White profile and velocity anisotropies do not introduce appreciable biases. In the high-S/N regime of upcoming surveys, accurate determination of cluster centres will be essential to avoid interpreting systematic effects as new physics. The Spectroscopic Stage-5 Experiment and the Wide Field Spectroscopic Telescope provide a promising route toward establishing gravitational redshifts as a valuable and complementary probe of modified gravity.
Reference Key
openalex_W7163555902 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Eleni Tsaprazi, Giorgio F Lesci, Federico Marulli, Alan Heavens, Enrico Maraboli
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1049
URL
https://doi.org/10.1093/mnras/stag1049
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.