The Resolved Sunyaev--Zel'dovich Profiles of Nearby Galaxy Groups

Abstract

Much of the baryons in galaxy groups are thought to have been driven out to large distances ($\gtrsim$$R_{500}$) by feedback, but there are few constraining observations of this extended gas. This work presents the resolved Sunyaev--Zel'dovich (SZ) profiles for a stacked sample of 10 nearby galaxy groups within the mass range log${}_{10}(M_{500}[M_{\odot }])=13.6-13.9$. We measured the SZ profiles using the publicly available $y$-map from the Planck Collaboration as well as our own $y$-maps constructed from more recent versions of $Planck$ data. The $y$-map extracted from the latest data release yielded a significant SZ detection out to 3 $R_{500}$. In addition, the stacked profile from these data were consistent with simulations that included AGN feedback. Our best-fit model using the latest $Planck$ data suggested a baryon fraction $\approx 5.6\%$ within $R_{500}$. This is significantly lower than the cosmic value of $\approx 16\%$, supporting the idea that baryons have been driven to large radii by AGN feedback. Lastly, we discovered a significant ($\sim 3\sigma$) "bump" feature near $\sim 2$ $R_{500}$ that is most likely the signature of internal accretion shocks.

15 pages, 10 figures, 1 table, published in ApJ

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• Hot Extended Galaxy Halos Around Local L* Galaxies From Sunyaev-Zeldovich Measurements
• Shocks in the Stacked Sunyaev-Zel'dovich Profiles of Clusters II: Measurements from SPT-SZ + Planck Compton-y Map
• Radio Scattering Horizons for Galactic and Extragalactic Transients
• The Evolution and Mass Dependence of Galaxy Cluster Pressure Profiles at 0.05 $\le z\le$ 0.60 and $4\times 10^{14}$ M${}_{\odot }$ $\le {\text{M}}_{500}\le 30\times 10^{14}$ M${}_{\odot }$
• Synchrotron emission from virial shocks around stacked OVRO-LWA galaxy clusters
• The Circumgalactic Medium from the CAMELS Simulations: Forecasting Constraints on Feedback Processes from Future Sunyaev-Zeldovich Observations