Universität zu Köln

Fazeli, Nastaran, Busch, Gerold, Valencia-S, Monica, Eckart, Andreas, Zajacek, Michal ORCID: 0000-0001-6450-1187, Combes, Francoise ORCID: 0000-0003-2658-7893 and Garcia-Burillo, Santiago ORCID: 0000-0003-0444-6897 (2019). Near-infrared observations of star formation and gas flows in the NUGA galaxy NGC 1365. Astron. Astrophys., 622. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

In the framework of understanding the gas and stellar kinematics and their relations to AGNs and galaxy evolution scenarios, we present spatially resolved distributions and kinematics of the stars and gas in the central similar to 800 pc radius of the nearby Seyfert galaxy NGC 1365. We obtained H + K- and K-band near-infrared (NIR) integral-field observations from VLT/SINFONI. Our results reveal strong broad and narrow emission-line components of ionized gas (hydrogen recombination lines Pa alpha and Br gamma) in the nuclear region, as well as hot dust with a temperature of similar to 1300 K, both typical for type-1 AGNs. From M-BH - sigma(*) and the broad components of hydrogen recombination lines, we find a black-hole mass of (5-10) x 10(6) M-circle dot. In the central similar to 800 pc, we find a hot molecular gas mass of similar to 615 M-circle dot, which corresponds to a cold molecular gas reservoir of (2-8) x 10(8) M-circle dot. However, there is a molecular gas deficiency in the nuclear region. The gas and stellar-velocity maps both show rotation patterns consistent with the large-scale rotation of the galaxy. However, the gaseous and stellar kinematics show deviations from pure disk rotation, which suggest streaming motions in the central <200 pc and a velocity twist at the location of the ring which indicates deviations in disk and ring rotation velocities in accordance with published CO kinematics. We detect a blueshifted emission line split in Pa alpha, associated with the nuclear region only. We investigate the star-formation properties of the hot spots in the circumnuclear ring which have starburst ages of less than or similar to 10 Myr and find indications for an age gradient on the western side of the ring. In addition, our high-resolution data reveal further substructure within this ring which also shows enhanced star forming activity close to the nucleus.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fazeli, Nastaran UNSPECIFIED UNSPECIFIED UNSPECIFIED Busch, Gerold UNSPECIFIED UNSPECIFIED UNSPECIFIED Valencia-S, Monica UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 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:38-156805
DOI:	10.1051/0004-6361/201834255
Journal or Publication Title:	Astron. Astrophys.
Volume:	622
Date:	2019
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; 1.644 MICRON EMISSION; MOLECULAR-HYDROGEN EXCITATION; BLACK-HOLE MASS; FE-II; SEYFERT-GALAXIES; IFU OBSERVATIONS; LOW-LUMINOSITY; SPECTRAL LIBRARY Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15680