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The two-phase gas outflow in the Circinus Galaxy

Published online by Cambridge University Press:  29 March 2021

M. A. Fonseca-Faria Open the ORCID record for M. A. Fonseca-Faria [Opens in a new window]  and
A. Rodríguez-Ardila Open the ORCID record for A. Rodríguez-Ardila [Opens in a new window]
M. A. Fonseca-Faria
Affiliation:
Instituto Nacional de Pesquisas Espaciais, Av. dos Astronautas, CEP 12227-010, São José dos Campos - SP, Brazil email: marcosfonsecafaria@gmail.com
A. Rodríguez-Ardila
Affiliation:
Instituto Nacional de Pesquisas Espaciais, Av. dos Astronautas, CEP 12227-010, São José dos Campos - SP, Brazil email: marcosfonsecafaria@gmail.com Laboratório Nacional de Astrofísica, R. dos Estados Unidos, CEP 37504-364, Itajubá - MG, Brazil
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Abstract

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We employ Multi Unit Spectroscopic Explorer (MUSE) data to study the ionized and very ionized gas phase of the feedback in Circinus, the closest Seyfert 2 galaxy. The analysis of the nebular emission allowed us to detect a remarkable high-ionization gas outflow, out of the galaxy plane, traced by the coronal lines [Fe viii] 6089Å and [Fe x] 6374Å, extending up to 700 parsecs north-west from the nucleus. The gas kinematics reveal expanding gas shells with velocities of a few hundred km s-1, spatially coincident with prominent hard X-ray emission detected by Chandra. Density and temperature sensitive line ratios show that the extended high-ionization gas is characterized by a temperature of up to 18000 K and a gas density of ne > 102 cm−3. We propose two scenarios consistent with the observations to explain the high-ionization component of the outflow: an active galactic nuclei (AGN) ejection that took place ⁓105 yr ago or local gas excitation by shocks produced by the passage of a radio jet.

Keywords

active galaxy nucleiSeyfertemission linesspectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 272 - 273
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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