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25 September 2022
 
  » arxiv » 2008.04917

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Constraints on precipitation-limited hot halos from massive galaxies to galaxy clusters
Priyanka Singh ; G. M. Voit ; Biman B. Nath ;
Date 11 Aug 2020
AbstractWe present constraints on a simple analytical model for hot diffuse halo gas, derived from a fit spanning two orders of magnitude in halo mass ($M_{500} sim 10^{12.5}-10^{14.5} M_{odot}$). The model is motivated by the observed prevalence of a precipitation limit, and its main free parameter is the central ratio of gas cooling timescale to free-fall timescale ($t_{ m cool}/t_{ m ff}$). Using stacked X-ray and thermal Sunyaev-Zel’dovich observations of the environments around massive galaxies, galaxy groups and clusters, we obtain the best-fitting model parameters. We find $t_{ m cool}/t_{ m ff} sim 50-110$, depending on the model extrapolation beyond the halo virial radius and possibly on biases present in the data-sets used in the fitting analysis. The model adequately describes the entire mass range, except for intermediate mass halos ($M_{500} sim 10^{13.5} M_{odot}$) which systematically fall below the model predictions. However, the best fits for $t_{ m cool}/t_{ m ff}$ substantially exceed the values typically derived from X-ray observations of individual systems ($t_{ m cool}/t_{ m ff} sim 10-30$). We consider several explanations for those discrepancies, including X-ray selection biases and a potential anti-correlation between X-ray luminosity and the central galaxy’s stellar mass.
Source arXiv, 2008.04917
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