Universität zu Köln

Busch, Gerold ORCID: 0000-0001-6679-5481, Eckart, Andreas ORCID: 0000-0001-6049-3132, Valencia-S, Monica, Fazeli, Nastaran, Scharwachter, Julia, Combes, Francoise ORCID: 0000-0003-2658-7893 and Garcia-Burillo, Santiago ORCID: 0000-0003-0444-6897 (2017). Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI. Astron. Astrophys., 598. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

Full text not available from this repository.

Abstract

NGC 1808 is a nearby barred spiral galaxy which hosts young stellar clusters in a patchy circumnuclear ring with a radius of similar to 240 pc. In order to study the gaseous and stellar kinematics and the star formation properties of the clusters, we perform seeing-limited H + Kband near-infrared integral-field spectroscopy with SINFONI of the inner similar to 600 pc. From the M-BH - sigma(*) relation, we find a black hole mass of a few 10(7) M-circle dot. We estimate the age of the young stellar clusters in the circumnuclear ring to be less than or similar to 10 Myr. No age gradient along the ring is visible. However, the starburst age is comparable to the travel time along the ring, indicating that the clusters almost completed a full orbit along the ring during their lifetime. In the central similar to 600 pc, we find a hot molecular gas mass of similar to 730 M-circle dot which, with standard conversion factors, corresponds to a large cold molecular gas reservoir of several 10(8) M-circle dot , in agreement with CO measurements from the literature. The gaseous and stellar kinematics show several deviations from pure disc motion, including a circumnuclear disc and signs of a nuclear bar potential. In addition, we confirm streaming motions on the similar to 200 pc scale that have recently been detected in CO(1-0) emission. Thanks to the enhanced angular resolution of < 1 '', we find further streaming motion within the inner arcsecond that had not been detected until now. Despite the flow of gas towards the centre, no signs of significant AGN activity are found. This raises the question: will the infalling gas fuel an AGN or star formation?

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Busch, Gerold UNSPECIFIED orcid.org/0000-0001-6679-5481 UNSPECIFIED Eckart, Andreas UNSPECIFIED orcid.org/0000-0001-6049-3132 UNSPECIFIED Valencia-S, Monica UNSPECIFIED UNSPECIFIED UNSPECIFIED Fazeli, Nastaran UNSPECIFIED UNSPECIFIED UNSPECIFIED Scharwachter, Julia UNSPECIFIED UNSPECIFIED UNSPECIFIED Combes, Francoise UNSPECIFIED orcid.org/0000-0003-2658-7893 UNSPECIFIED Garcia-Burillo, Santiago UNSPECIFIED orcid.org/0000-0003-0444-6897 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-240230
DOI:	10.1051/0004-6361/201629440
Journal or Publication Title:	Astron. Astrophys.
Volume:	598
Date:	2017
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INTEGRAL FIELD SPECTROSCOPY; SUPERMASSIVE BLACK-HOLES; ACTIVE GALACTIC NUCLEI; MOLECULAR-HYDROGEN EXCITATION; 1.644 MICRON EMISSION; FE-II; NEARBY GALAXIES; TRANSITION-PROBABILITIES; INFRARED GALAXIES; RADIO-CONTINUUM Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24023