Gravitational redshifting of galaxies in the SPIDERS cluster catalogue

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dc.contributor.authorMpetha, C. T.
dc.contributor.authorCollins, C. A.
dc.contributor.authorClerc, N.
dc.contributor.authorFinoguenov, A.
dc.contributor.authorPeacock, J. A.
dc.contributor.authorComparat, J.
dc.contributor.authorSchneider, D.
dc.contributor.authorCapasso, R.
dc.contributor.authorDamsted, S.
dc.contributor.authorFurnell, K.
dc.contributor.authorMerloni, A.
dc.contributor.authorPadilla, N. D.
dc.contributor.authorSaro, A.
dc.date.accessioned2025-01-20T23:53:04Z
dc.date.available2025-01-20T23:53:04Z
dc.date.issued2021
dc.description.abstractData from the SPectroscopic IDentification of ERosita Sources (SPIDERS) are searched for a detection of the gravitational redshifting of light from similar to 20 000 galaxies in similar to 2500 galaxy clusters using three definitions of the cluster centre: its Brightest Cluster Galaxy (BCG), the redMaPPer identified Central Galaxy (CG), or the peak of X-ray emission. Distributions of velocity offsets between galaxies and their host cluster's centre, found using observed redshifts, are created. The quantity (Delta) over cap, the average of the radial velocity difference between the cluster members and the cluster systemic velocity, reveals information on the size of a combination of effects on the observed redshift, dominated by gravitational redshifting. The change of (Delta) over cap with radial distance is predicted for SPIDERS galaxies in General Relativity (GR), and f(R) gravity, and compared to the observations. The values of (Delta) over cap = -13.5 +/- 4.7 kms(-1), (Delta) over cap = -12.5 +/- 5.1 kms(-1), and (Delta) over cap = -18.6 +/- 4.8 kms(-1) for the BCG, X-ray, and CG cases, respectively, broadly agree with the literature. There is no significant preference of one gravity theory over another, but all cases give a clear detection (>2.5 sigma) of (Delta) over cap. The BCG centroid is deemed to be the most robust method in this analysis, due to no well-defined central redshift when using an X-ray centroid, and CGs identified by redMaPPer with no associated spectroscopic redshift. For future gravitational redshift studies, an order-of-magnitude more galaxies, similar to 500 000, will be required - a possible feat with the forthcoming Vera C. Rubin Observatory, Euclid and eROSITA.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stab544
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stab544
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94939
dc.identifier.wosidWOS:000641987400048
dc.issue.numero1
dc.language.isoen
dc.pagina.final678
dc.pagina.inicio669
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgravitation
dc.subjectgalaxies: clusters: general
dc.subjectgalaxies: kinematics and dynamics
dc.titleGravitational redshifting of galaxies in the SPIDERS cluster catalogue
dc.typeartículo
dc.volumen503
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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