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Article overview
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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