Universität zu Köln

Fazeli, Nastaran, Busch, Gerold, Eckart, Andreas ORCID: 0000-0001-6049-3132, Combes, Francoise, Misquitta, Persis and Straubmeier, Christian (2020). Central kiloparsec of NGC 1326 observed with SINFONI: A nuclear molecular disc inside the starburst ring. Astron. Astrophys., 638. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

Full text not available from this repository.

Abstract

Gas inflow processes in the vicinity of galactic nuclei play a crucial role in galaxy evolution and supermassive black hole growth. Exploring the central kiloparsec of galaxies is essential to shed more light on this subject. We present near-infrared H- and K-band results of the nuclear region of the nearby galaxy NGC 1326, observed with the integral-field spectrograph SINFONI mounted on the Very Large Telescope. The field of view covers 9 '' x9 '' (650x650 pc(2)). Our work is concentrated on excitation conditions, morphology, and stellar content. The nucleus of NGC 1326 was classified as a LINER, however in our data we observed an absence of ionised gas emission in the central r similar to 3 ''. We studied the morphology by analysing the distribution of ionised and molecular gas, and thereby detected an elliptically shaped, circum-nuclear star-forming ring at a mean radius of 300 pc. We estimate the starburst regions in the ring to be young with dominating ages of < 10 Myr. The molecular gas distribution also reveals an elongated east to west central structure about 3 '' in radius, where gas is excited by slow or mild shock mechanisms. We calculate the ionised gas mass of 8x10(5)M(circle dot) completely concentrated in the nuclear ring and the warm molecular gas mass of 187 M-circle dot, from which half is concentrated in the ring and the other half in the elongated central structure. The stellar velocity fields show pure rotation in the plane of the galaxy. The gas velocity fields show similar rotation in the ring, but in the central elongated H-2 structure they show much higher amplitudes and indications of further deviation from the stellar rotation in the central 1 '' aperture. We suggest that the central 6 '' elongated H-2 structure might be a fast-rotating central disc. The CO(3-2) emission observations with the Atacama Large Millimeter/submillimeter Array reveal a central 1 '' torus. In the central 1 '' of the H-2 velocity field and residual maps, we find indications for a further decoupled structure closer to a nuclear disc, which could be identified with the torus surrounding the supermassive black hole.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fazeli, Nastaran UNSPECIFIED UNSPECIFIED UNSPECIFIED Busch, Gerold UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, Andreas UNSPECIFIED orcid.org/0000-0001-6049-3132 UNSPECIFIED Combes, Francoise UNSPECIFIED UNSPECIFIED UNSPECIFIED Misquitta, Persis UNSPECIFIED UNSPECIFIED UNSPECIFIED Straubmeier, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-330192
DOI:	10.1051/0004-6361/201936451
Journal or Publication Title:	Astron. Astrophys.
Volume:	638
Date:	2020
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; ACTIVE GALACTIC NUCLEI; SUPERMASSIVE BLACK-HOLES; CIRCUMNUCLEAR STAR-FORMATION; SOUTHERN GALAXIES; NEARBY GALAXIES; GAS; EMISSION; VELOCITY; HYDROGEN Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33019