AGN feeding and feedback in Fornax A: kinematical analysis of the multi-phase ISM
| Autor: | Maccagni, F. M., Serra, P., Gaspari, M., Kleiner, D., Morokuma-Matsui, K., Oosterloo, T. A., Onodera, M., Kamphuis, P., Loi, F., Thorat, K., Ramatsoku, M., Smirnov, O., White, S. V. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | A&A 656, A45 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202141143 |
| Popis: | We present a multi-wavelength study of the gaseous medium surrounding the nearby active galactic nucleus (AGN) Fornax A. Using MeerKAT, ALMA and MUSE observations we reveal a complex distribution of the atomic (HI), molecular (CO), and ionised gas in its centre and along the radio jets. By studying the multi-scale kinematics of the multi-phase gas, we reveal the presence of concurrent AGN feeding and feedback phenomena. Several clouds and an extended 3 kpc filament -- perpendicular to the radio jets and the inner disk ($r\lesssim 4.5$ kpc) -- show highly-turbulent kinematics, which likely induces nonlinear condensation and subsequent Chaotic Cold Accretion (CCA) onto the AGN. In the wake of the radio jets and in an external ($r\gtrsim 4.5$ kpc) ring, we identify an entrained massive ($\sim$ $10^7$ M$_\odot$) multi-phase outflow ($v_{\rm OUT}\sim 2000$ km s$^{-1}$). The rapid flickering of the nuclear activity of Fornax A ($\sim$ 3 Myr) and the gas experiencing turbulent condensation raining onto the AGN provide quantitative evidence that a recurrent, tight feeding and feedback cycle may be self-regulating the activity of Fornax A, in agreement with CCA simulations. To date, this is one of the most in-depth probes of such a mechanism, paving the way to apply these precise diagnostics to a larger sample of nearby AGN hosts and their multi-phase ISM. Comment: 22 pages, 20 figures, accepted for publication on Astronomy & Astrophysics |
| Databáze: | arXiv |
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