The case for hot-mode accretion in Abell 2029

Deovrat, Prasad, Voit, G. Mark and O'Shea, Brian W. 2024. The case for hot-mode accretion in Abell 2029. Monthly Notices of the Royal Astronomical Society 531 (1) , pp. 259-266. 10.1093/mnras/stae1203

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Abstract

Radiative cooling and active galactic nucleus heating are thought to form a feedback loop that regulates the evolution of low-redshift cool-core galaxy clusters. Numerical simulations suggest that the formation of multiphase gas in the cluster core imposes a floor on the ratio of cooling time (tcool) to free-fall time (tff) at min(tcool/tff) ≈ 10. Observations of galaxy clusters show evidence for such a floor, and usually the cluster cores with min(tcool/tff) ≲ 30 contain abundant multiphase gas. However, there are important outliers. One of them is Abell 2029 (A2029), a massive galaxy cluster (M200 ≳ 1015 M⊙) with min(tcool/tff) ∼ 20, but little apparent multiphase gas. In this paper, we present high-resolution 3D hydrodynamic adaptive mesh refinement simulations of a cluster similar to A2029 and study how it evolves over a period of 1–2 Gyr. Those simulations suggest that A2029 self-regulates without producing multiphase gas because the mass of its central black hole (⁠ ⁠) is great enough for Bondi accretion of hot ambient gas to produce enough feedback energy to compensate for radiative cooling.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Oxford University Press
ISSN:	0035-8711
Date of First Compliant Deposit:	3 May 2024
Date of Acceptance:	29 April 2024
Last Modified:	05 Jul 2024 10:40
URI:	https://orca.cardiff.ac.uk/id/eprint/168712

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