Shocks in the stacked Sunyaev-Zel’dovich profiles of clusters II: Measurements from SPT-SZ +  Planck Compton- y map

Journal Article · Thu May 19 00:00:00 EDT 2022 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stac1376· OSTI ID:1873188

Anbajagane, D. ; Chang, C. ; Jain, B. ; Adhikari, S. ; Baxter, E. J. ; Benson, B. A. ; Bleem, L. E. ; Bocquet, S. ; Calzadilla, M. S. ; Carlstrom, J. E. ; Chang, C. L. ; Chown, R. ; Crawford, T. M. ; Crites, A. T.; Cui, W. ; de Haan, T.; Mascolo, L. Di ; Dobbs, M. A.; Everett, W. B. ; George, E. M. ; Grandis, S.; Halverson, N. W. ; Holder, G. P.; Holzapfel, W. L.; Hrubes, J. D.; Lee, A. T. ; Luong-Van, D.; McDonald, M. A.; McMahon, J. J.; Meyer, S. S.; Millea, M.; Mocanu, L. M.; Mohr, J. J. ; Natoli, T.; Omori, Y.; Padin, S.; Pryke, C.; Reichardt, C. L. ; Ruhl, J. E.; Saro, A. ; Schaffer, K. K.; Shirokoff, E. ; Staniszewski, Z.; Stark, A. A. ; Vieira, J. D. ; Williamson, R.

Our team searches for the signature of cosmological shocks in stacked gas pressure profiles of galaxy clusters using data from the South Pole Telescope (SPT). Specifically, we stack the latest Compton-y maps from the 2500 deg² SPT-SZ survey on the locations of clusters identified in that same dataset. The sample contains 516 clusters with mean mass $$\langle$$M_200m$$\rangle$$ = 10^14.9 M_⊙ and redshift $$\langle$$z$$\rangle$$ = 0.55. We analyse in parallel a set of zoom-in hydrodynamical simulations from THE THREE HUNDRED project. The SPT-SZ data show two features: (i) a pressure deficit at R/R_200m = 1.08 ± 0.09, measured at 3.1σ significance and not observed in the simulations, and; (ii) a sharp decrease in pressure at R/R_200m = 4.58 ± 1.24 at 2.0σ significance. The pressure deficit is qualitatively consistent with a shock-induced thermal non-equilibrium between electrons and ions, and the second feature is consistent with accretion shocks seen in previous studies. We split the cluster sample by redshift and mass, and find both features exist in all cases. There are also no significant differences in features along and across the cluster major axis, whose orientation roughly points towards filamentary structure. As a consistency test, we also analyse clusters from the Planck and Atacama Cosmology Telescope Polarimeter surveys and find quantitatively similar features in the pressure profiles. Finally, we compare the accretion shock radius (R_{sh, acc}) with existing measurements of the splashback radius (R_sp) for SPT-SZ and constrain the lower limit of the ratio, R_{sh, acc}/R_sp > 2.16 ± 0.59.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: SC0007901; AC02-07CH11359; AC02-05CH11231
• OSTI ID: 1873188
• Alternate ID(s): OSTI ID: 1839577; OSTI ID: 1923895
• Report Number(s): FERMILAB-PUB-21-731-PPD; arXiv:2111.04778
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 514 Journal Issue: 2; ISSN 0035-8711
• Publisher: Oxford University Press
• Country of Publication: United Kingdom
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
galaxies: clusters: intracluster medium
large-scale structure of Universe