Prasad, Deovrat and Sharma, Prateek and Babul, Arif (2017) AGN jet-driven stochastic cold accretion in cluster cores. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 471 (2). pp. 1531-1542.
Full text not available from this repository. (Request a copy)Abstract
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 less than or similar to 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.
| Item Type: | Journal Article |
|---|---|
| Publication: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| Additional Information: | Copy right for this article belongs to the OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 23 Sep 2017 05:11 |
| Last Modified: | 23 Sep 2017 05:11 |
| URI: | http://eprints.iisc.ac.in/id/eprint/57852 |
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