A 3D model for the stellar populations in the nuclei of NGC 1433, NGC 1566, and NGC 1808 NIR photometry, CO absorption lines, and line-of-sight velocity and its dispersion

0574034 - ASÚ 2024 RIV FR eng J - Journal Article
Vermot, Pierre - Palouš, Jan - Barna, B. - Ehlerová, Soňa - Morris, M. - Wünsch, Richard
A 3D model for the stellar populations in the nuclei of NGC 1433, NGC 1566, and NGC 1808 NIR photometry, CO absorption lines, and line-of-sight velocity and its dispersion.
Astronomy & Astrophysics. Roč. 674, June (2023), č. článku A135. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : astronomical databases * miscellaneous * galaxies
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access

We aim to characterize the properties of the stellar populations in the central few hundred parsecs of nearby galactic nuclei, specifically their age, mass, and 3D geometry. We use spatially resolved spectroscopic observations of NGC 1433, NGC 1566, and NGC 1808 obtained with SINFONI to constrain a 3D model composed of a spherically symmetric nuclear star cluster (NSC) and an extended thick stellar disk. We computed UV to mid-infrared single stellar population (UMISSP) spectra to determine the age of the stellar populations and construct synthetic observations for our model. To overcome degeneracies between key parameters, we simultaneously fit the spatially resolved line-of-sight velocity, line-of-sight-velocity-dispersion, low-spectral-resolution NIR continuum, and high-spectral-resolution CO absorption features for each pixel. For the three objects, we derive the age and mass of the young and old stellar populations in the NSC and surrounding disk, as well as their 3D geometry: radius for the NSC, thickness, inclination, and position angle for the disk. These results are consistent with published independent measurements when available. The proposed method allows us to derive a consistent 3D model of the stellar populations in nearby galactic centers solely based on a near-infrared IFU observation.
Permanent Link: https://hdl.handle.net/11104/0344395