Universität zu Köln

Combes, F., Garcia-Burillo, S., Casasola, V., Hunt, L. K., Krips, M., Baker, A. J., Boone, F., Eckart, A., Marquez, I., Neri, R., Schinnerer, E. and Tacconi, L. J. (2014). ALMA reveals the feeding of the Seyfert 1 nucleus in NGC 1566. Astron. Astrophys., 565. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

Full text not available from this repository.

Abstract

We report ALMA observations of CO(3-2) emission in the Seyfert 1 galaxy NGC 1566, at a spatial resolution of 25 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central kpc, and to probe nuclear fueling and feedback phenomena. NGC 1566 has a nuclear bar of 1.7 kpc radius and a conspicuous grand design spiral starting from this radius. The ALMA field of view, of diameter 0.9 kpc, lies well inside the nuclear bar and reveals a molecular trailing spiral structure from 50 to 300 pc in size, which is contributing to fuel the nucleus, according to its negative gravity torques. The spiral starts with a large pitch angle from the center and then winds up in a pseudo-ring at the inner Lindblad resonance (ILR) of the nuclear bar. This is the first time that a trailing spiral structure is clearly seen driving the gas inwards inside the ILR ring of the nuclear bar. This phenomenon shows that the massive central black hole has a significant dynamical influence on the gas, triggering its fueling. The gaseous spiral is well correlated with the dusty spiral seen through extinction in HST images, and also with a spiral feature emitting 0.87 mm continuum. This continuum emission must come essentially from cold dust heated by the interstellar radiation field. The HCN(4-3) and HCO+(4-3) lines were simultaneously mapped and detected in the nuclear spiral. The HCO+(4-3) line is 3 times stronger than the HCN(4-3), as expected when star formation excitation dominates over active galactic nucleus (AGN) heating. The CO(3-2)/HCO+(4-3) integrated intensity ratio is similar to 100. The molecular gas is in remarkably regular rotation, with only slight non-circular motions at the periphery of the nuclear spiral arms. These perturbations are quite small, and no outflow nor AGN feedback is detected.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Combes, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia-Burillo, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Casasola, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hunt, L. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krips, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Baker, A. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boone, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Marquez, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Neri, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schinnerer, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tacconi, L. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-438782
DOI:	10.1051/0004-6361/201423433
Journal or Publication Title:	Astron. Astrophys.
Volume:	565
Date:	2014
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 ACTIVE GALACTIC NUCLEI; EDGE-ON GALAXIES; CENTRAL 100 PC; MOLECULAR GAS; BLACK-HOLES; CIRCUMNUCLEAR DUST; COSMOLOGICAL SIMULATIONS; BURE INTERFEROMETER; INACTIVE GALAXIES; SPIRAL GALAXIES Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43878