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H I Depletion Begins Well Beyond the Virial Radius: A FAST Stacking Study of 36 Galaxy Clusters to 5 × R200

  • Authors: Cheng Cheng, Chuan-Peng Zhang, Edo Ibar, Rory Smith, Weiwei Xu, Hyowon Kim, Jia-Sheng Huang, Wei Zhang, Pei Zuo, Hugo Méndez-Hernández, Juan Molina, Ming Zhu, Qian Yu

Cheng Cheng et al 2026 The Astrophysical Journal 1009 .

  • Provider: AAS Journals

Caption: Figure 10.

Average H I mass (top panel) and average H I-to-stellar mass ratio (bottom panel) in different radial and mass bins for galaxies in relaxed clusters (open squares) and disturbed clusters (open diamonds), compared with the full cluster sample (open circles). For clarity, data points at the same radial bin are horizontally offset by 0.1 dex to avoid overlapping error bars; the offset has no physical meaning. While the overall trends are consistent with those of the full cluster sample, the total stacked signal may fall outside the relaxed and disturbed values due to baseline subtraction and the exclusion of five galaxy clusters from the stack, although the associated uncertainties remain self-consistent. A roughly 1σ difference is observed in the innermost radial bin, potentially indicating a mild dependence of the gas content on the cluster dynamical state. The splashback radius of clusters at ∼1.5, R200 is shown by the vertical dashed line (T. Shin et al. 2019).

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