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

Published online by Cambridge University Press:  29 March 2021

F. M. Maccagni Open the ORCID record for F. M. Maccagni [Opens in a new window] ,
P. Serra ,
M. Murgia ,
F. Govoni ,
K. Morokuma-Matsui  and
D. Kleiner
F. M. Maccagni
Affiliation:
INAF – Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy email: [email protected]
P. Serra
Affiliation:
INAF – Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy email: [email protected]
M. Murgia
Affiliation:
INAF – Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy email: [email protected]
F. Govoni
Affiliation:
INAF – Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy email: [email protected]
K. Morokuma-Matsui
Affiliation:
Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
D. Kleiner
Affiliation:
INAF – Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy email: [email protected]
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Abstract

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Sensitive (noise ∼16 μJy beam−1), high-resolution (∼10″) MeerKAT observations of 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 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 (∼3 Myr ago), a less powerful and short (≲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.

Keywords

galaxies: individual: (Fornax A, NGC 1316)galaxies: activeradio continuum: galaxiesgalaxies: jetsradiation mechanisms: non-thermal
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 141 - 146
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

Footnotes

†

This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 679627).

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