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Main Authors: Saxena, H., Heinrich, A., Sayers, J., Zhuravleva, I., Bulbul, E., Sanders, J., Avestruz, C., Thakur, R. Basu, Battistelli, E., Botteon, A., Cacciotti, F., Columbro, F., Coppolecchia, A., Cray, S., de Bernardis, P., De Petris, M., Lamagna, L., Lau, E. T., Masi, S., Paiella, A., Piacentini, F., Rapaport, E., Rudnick, L., White, D., ZuHone, J.
Format: Preprint
Published: 2026
Subjects:
Cosmology and Nongalactic Astrophysics
High Energy Astrophysical Phenomena
Online Access:https://arxiv.org/abs/2602.21443
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author Saxena, H.
Heinrich, A.
Sayers, J.
Zhuravleva, I.
Bulbul, E.
Sanders, J.
Avestruz, C.
Thakur, R. Basu
Battistelli, E.
Botteon, A.
Cacciotti, F.
Columbro, F.
Coppolecchia, A.
Cray, S.
de Bernardis, P.
De Petris, M.
Lamagna, L.
Lau, E. T.
Masi, S.
Paiella, A.
Piacentini, F.
Rapaport, E.
Rudnick, L.
White, D.
ZuHone, J.
author_facet Saxena, H.
Heinrich, A.
Sayers, J.
Zhuravleva, I.
Bulbul, E.
Sanders, J.
Avestruz, C.
Thakur, R. Basu
Battistelli, E.
Botteon, A.
Cacciotti, F.
Columbro, F.
Coppolecchia, A.
Cray, S.
de Bernardis, P.
De Petris, M.
Lamagna, L.
Lau, E. T.
Masi, S.
Paiella, A.
Piacentini, F.
Rapaport, E.
Rudnick, L.
White, D.
ZuHone, J.
contents Galaxy clusters form through hierarchical assembly, where smaller substructures merge to build the largest gravitationally bound objects in the universe. These mergers, combined with feedback from AGN, filamentary accretion, and other energy injection processes, generate turbulence and perturbations within the intra-cluster medium (ICM). X-ray and Sunyaev-Zel'dovich (SZ) observations can be utilized to measure these ICM density and pressure inhomogeneities, in turn providing constraints on the effective Equation of State (EOS) of the perturbations and ICM velocities. In this work, we analyze deep SRG-eROSITA and Planck/SPT observations of Abell 3266 (A3266), a dynamically complex merging cluster with elongated morphology and significant substructure. We measure pressure and density fluctuations, and compute the power spectra and deprojected 3D amplitudes of these perturbations. We estimate the ratio of pressure-to-density fluctuation amplitudes as $1.00 \pm 0.55$ and non-thermal pressure support $0.068 \pm 0.050$. Density fluctuations are found to be stronger in the northern sector of the cluster compared to the south, consistent with ongoing accretion along a filamentary structure revealed by eROSITA. Further, we find the amplitude of density fluctuations increases with radius, qualitatively consistent with the trend found in cosmological simulations. Uncertainties in our results are dominated by the relatively low sensitivity of current Planck/SPT data, suggesting that improvements in SZ data quality could substantially improve our understanding of ICM energy injection, transport, and dissipation from this technique.
format Preprint
id arxiv_https___arxiv_org_abs_2602_21443
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Intracluster Medium Fluctuations on Scales up to 1 Mpc: A Combined eROSITA and SPT/Planck Analysis of Abell 3266
Saxena, H.
Heinrich, A.
Sayers, J.
Zhuravleva, I.
Bulbul, E.
Sanders, J.
Avestruz, C.
Thakur, R. Basu
Battistelli, E.
Botteon, A.
Cacciotti, F.
Columbro, F.
Coppolecchia, A.
Cray, S.
de Bernardis, P.
De Petris, M.
Lamagna, L.
Lau, E. T.
Masi, S.
Paiella, A.
Piacentini, F.
Rapaport, E.
Rudnick, L.
White, D.
ZuHone, J.
Cosmology and Nongalactic Astrophysics
High Energy Astrophysical Phenomena
Galaxy clusters form through hierarchical assembly, where smaller substructures merge to build the largest gravitationally bound objects in the universe. These mergers, combined with feedback from AGN, filamentary accretion, and other energy injection processes, generate turbulence and perturbations within the intra-cluster medium (ICM). X-ray and Sunyaev-Zel'dovich (SZ) observations can be utilized to measure these ICM density and pressure inhomogeneities, in turn providing constraints on the effective Equation of State (EOS) of the perturbations and ICM velocities. In this work, we analyze deep SRG-eROSITA and Planck/SPT observations of Abell 3266 (A3266), a dynamically complex merging cluster with elongated morphology and significant substructure. We measure pressure and density fluctuations, and compute the power spectra and deprojected 3D amplitudes of these perturbations. We estimate the ratio of pressure-to-density fluctuation amplitudes as $1.00 \pm 0.55$ and non-thermal pressure support $0.068 \pm 0.050$. Density fluctuations are found to be stronger in the northern sector of the cluster compared to the south, consistent with ongoing accretion along a filamentary structure revealed by eROSITA. Further, we find the amplitude of density fluctuations increases with radius, qualitatively consistent with the trend found in cosmological simulations. Uncertainties in our results are dominated by the relatively low sensitivity of current Planck/SPT data, suggesting that improvements in SZ data quality could substantially improve our understanding of ICM energy injection, transport, and dissipation from this technique.
title Intracluster Medium Fluctuations on Scales up to 1 Mpc: A Combined eROSITA and SPT/Planck Analysis of Abell 3266
topic Cosmology and Nongalactic Astrophysics
High Energy Astrophysical Phenomena
url https://arxiv.org/abs/2602.21443

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