Astrophysics > Astrophysics of Galaxies
[Submitted on 3 Aug 2021 (v1), last revised 6 Jan 2022 (this version, v3)]
Title:Massive Molecular Gas as a Fuel Tank for Active Galactic Nuclei Feedback in Central Cluster Galaxies
View PDFAbstract:Massive molecular gas has been discovered in giant elliptical galaxies at the centers of galaxy clusters. To reveal its role in active galactic nucleus (AGN) feedback in those galaxies, we construct a semianalytical model of gas circulation. This model especially focuses on the massive molecular gas (interstellar cold gas on a scale of ~ 10 kpc) and the circumnuclear disk (~< 0.5 kpc). We consider the destruction of the interstellar cold gas by star formation and the gravitational instability for the circumnuclear disk. Our model can reproduce the basic properties of the interstellar cold gas and the circumnuclear disk, such as their masses. We also find that the circumnuclear disk tends to stay at the boundary between stable and unstable states. This works as an 'adjusting valve' that regulates mass accretion toward the supermassive black hole. On the other hand, the interstellar cold gas serves as a 'fuel tank' in the AGN feedback. Even if the cooling of the galactic hot gas is prevented, the interstellar cold gas can sustain the AGN activity for ~> 0.5 Gyr. We also confirm that the small entropy of the hot gas (~< 30 keV cm^2) or the short cooling time (~< 1 Gyr) is a critical condition for the existence of the massive amounts of molecular gas in the galaxy. The dissipation time of the interstellar cold gas may be related to the critical cooling time. The galaxy behavior is described by a simple relation among the disk stability, the cloud dissipation time, and the gas cooling rate.
Submission history
From: Yutaka Fujita [view email][v1] Tue, 3 Aug 2021 18:00:00 UTC (1,215 KB)
[v2] Wed, 20 Oct 2021 06:23:42 UTC (1,246 KB)
[v3] Thu, 6 Jan 2022 21:29:53 UTC (1,246 KB)
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