AGN jet-driven stochastic cold accretion in cluster cores - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2017

AGN jet-driven stochastic cold accretion in cluster cores

Deovrat Prasad
  • Fonction : Auteur
Prateek Sharma
  • Fonction : Auteur

Résumé

Several arguments suggest that stochastic condensation of cold gas and its accretion on to the central supermassive black hole (SMBH) is essential for active galactic nuclei (AGNs) feedback to work in the most massive galaxies that lie at the centres of galaxy clusters. Our 3-D hydrodynamic AGN jet-ICM (intracluster medium) simulations, looking at the detailed angular momentum distribution of cold gas and its time variability for the first time, show that the angular momentum of the cold gas crossing ≲1 kpc is essentially isotropic. With almost equal mass in clockwise and counterclockwise orientations, we expect a cancellation of the angular momentum on roughly the dynamical time. This means that a compact accretion flow with a short viscous time ought to form, through which enough accretion power can be channeled into jet mechanical energy sufficiently quickly to prevent a cooling flow. The inherent stochasticity, expected in feedback cycles driven by cold gas condensation, gives rise to a large variation in the cold gas mass at the centres of galaxy clusters, for similar cluster and SMBH masses, in agreement with the observations. Such correlations are expected to be much tighter for the smoother hot/Bondi accretion. The weak correlation between cavity power and Bondi power obtained from our simulations also matches observations.

Dates et versions

hal-01584682 , version 1 (09-09-2017)

Identifiants

Citer

Deovrat Prasad, Prateek Sharma, Arif Babul. AGN jet-driven stochastic cold accretion in cluster cores. Monthly Notices of the Royal Astronomical Society, 2017, 471 (2), pp.1531-1542. ⟨10.1093/mnras/stx1698⟩. ⟨hal-01584682⟩
42 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More