The MAGNUM survey: positive feedback in the nuclear region of NGC 5643 suggested by MUSE

Journal
Date Issued
2015
Author(s)
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Risaliti, G.
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Carniani, S.
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Maiolino, R.
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Brusa, M.
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CICONE, CLAUDIA
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Bland-Hawthorn, J.
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Nagao, T.
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Salvato, M.
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Sani, E.
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Urrutia, T.
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Venturi, G.
DOI
Description
MUSE data were obtained from observations made with the ESO Telescopes at the Paranal Observatories. We are grateful to the ESO staff for their work and support. We are grateful to C. Leipski for providing us the VLA radio data of NGC 5643. G.C., A.M., and S.Z. acknowledge support from grant PRIN-INAF 2011 “Black hole growth and AGN feedback through the cosmic time” and from grant PRIN-MIUR 2010-2011 “The dark Universe and the cosmic evolution of baryons: from current surveys to Euclid”. S.Z. and A.G. have been supported by the EU Marie Curie Integration Grant “SteMaGE” No. PCIG12-GA-2012-326466 (Call Identifier: FP7-PEOPLE-2012 CIG). A.G. acknowledges support from the European Union FP7/2007-2013 under grant agreement No. 267251 (AstroFIt). M.B. acknowledges support from the FP7 Career Integration Grant “eEASy” (CIG 321913).
Abstract
We study the ionization and kinematics of the ionized gas in the nuclear region of the barred Seyfert 2 galaxy NGC 5643 using MUSE integral field observations in the framework of the Measuring Active Galactic Nuclei Under MUSE Microscope (MAGNUM) survey. The data were used to identify regions with different ionization conditions and to map the gas density and the dust extinction. We find evidence for a double-sided ionization cone, possibly collimated by a dusty structure surrounding the nucleus. At the center of the ionization cone, outflowing ionized gas is revealed as a blueshifted, asymmetric wing of the [OIII] emission line, up to projected velocity v10 ~ -450 km s-1. The outflow is also seen as a diffuse, low-luminosity radio and X-ray jet, with similar extension. The outflowing material points in the direction of two clumps characterized by prominent line emission with spectra typical of HII regions, located at the edge of the dust lane of the bar. We propose that the star formation in the clumps is due to positive feedback induced by gas compression by the nuclear outflow, providing the first candidate for outflow-induced star formation in a Seyfert-like, radio-quiet AGN. This suggests that positive feedback may be a relevant mechanism in shaping the black hole-host galaxy coevolution. This work is based on observations made at the European Southern Observatory, Paranal, Chile (ESO program 60.A-9339).
Volume
582
Start page
A63
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2015A&A...582A..63C
Rights
open.access
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