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Astrophysics > Astrophysics of Galaxies

arXiv:2006.00897 (astro-ph)
[Submitted on 1 Jun 2020]

Title:The recurrent nuclear activity of Fornax A and its interaction with the cold gas

Authors:F. M. Maccagni, P. Serra, M. Murgia, F. Govoni, K. Morokuma-Matsui, D. Kleiner
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Abstract:Sensitive (noise $\sim 16\,\mu$\Jyb), high-resolution ($\sim 10''$) MeerKAT observations of Fornax A show that its giant lobes have a double-shell morphology, where dense filaments are embedded in a diffuse and extended cocoon, while the central radio jets are confined within the host galaxy. The spectral radio properties of the lobes and jets of Fornax A reveal that its nuclear activity is rapidly flickering. Multiple episodes of nuclear activity must have formed the radio lobes, for which the last stopped $12$ Myr ago. More recently ($\sim 3$ Myr ago), a less powerful and short ($\lesssim 1$ Myr) phase of nuclear activity generated the central jets. The distribution and kinematics of the neutral and molecular gas in the centre give insights on the interaction between the recurrent nuclear activity and the surrounding interstellar medium.
Comments: 5 pages, 3 figures; proceedings of IAU Symposium No. 359, 2020 -- Galaxy Evolution and Feedback Across Different Environments
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2006.00897 [astro-ph.GA]
  (or arXiv:2006.00897v1 [astro-ph.GA] for this version)
  https://doi.org/10.48550/arXiv.2006.00897
Related DOI: https://doi.org/10.1017/S1743921320004287

Submission history

From: Filippo Marcello Maccagni [view email]
[v1] Mon, 1 Jun 2020 12:49:49 UTC (1,941 KB)
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