Universität zu Köln

Audibert, A., Combes, F., Garcia-Burillo, S., Hunt, L., Eckart, A., Aalto, S., Casasola, V, Boone, F., Krips, M., Viti, S., Muller, S., Dasyra, K., van der Werf, P. and Martin, S. (2021). Black hole feeding and star formation in NGC1808. Astron. Astrophys., 656. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We report on Atacama Large Millimeter Array (ALMA) observations of CO(3-2) emission in the Seyfert2/starburst galaxy NGC1808, at a spatial resolution of 4 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central 0.5 kpc and to probe the nuclear feeding and feedback phenomena. We discovered a nuclear spiral of radius 1 '' = 45 pc. Within it, we found a decoupled circumnuclear disk or molecular torus of a radius of 0:13 '' = 6 pc. The HCN(4-3) and HCO+(4-3) and CS(7-6) dense gas line tracers were simultaneously mapped and detected in the nuclear spiral and they present the same misalignment in the molecular torus. At the nucleus, the HCN/HCO+ and HCN/CS ratios indicate the presence of an active galactic nucleus (AGN). The molecular gas shows regular rotation, within a radius of 400 pc, except for the misaligned disk inside the nuclear spiral arms. The computations of the torques exerted on the gas by the barred stellar potential reveal that the gas within a radius of 100 pc is feeding the nucleus on a timescale of five rotations or on an average timescale of similar to 60 Myr. Some non-circular motions are observed towards the center, corresponding to the nuclear spiral arms. We cannot rule out that small extra kinematic perturbations could be interpreted as a weak outflow attributed to AGN feedback. The molecular outflow detected at >= 250 pc in the NE direction is likely due to supernovae feedback and it is connected to the kpc-scale superwind.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Audibert, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Combes, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia-Burillo, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hunt, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aalto, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Casasola, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Boone, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krips, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Viti, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Muller, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dasyra, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Werf, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Martin, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-604936
DOI:	10.1051/0004-6361/202039886
Journal or Publication Title:	Astron. Astrophys.
Volume:	656
Date:	2021
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SPIRAL GALAXY NGC-1808; MOLECULAR GAS; RADIO-CONTINUUM; ALMA IMAGES; LINE; OUTFLOW; NUCLEAR; EMISSION; FEEDBACK; TORUS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/60493