| Issue |
A&A
Volume 674, June 2023
|
|
|---|---|---|
| Article Number | A135 | |
| Number of page(s) | 16 | |
| Section | Catalogs and data | |
| DOI | https://doi.org/10.1051/0004-6361/202245627 | |
| Published online | 13 June 2023 | |
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★
1
Astronomical Institute of the Czech Academy of Sciences,
Boční II 1401/1,
140 00
Prague, Czech Republic
e-mail: pierre.vermot@asu.cas.cz
2
Department of Physics and Astronomy, University of California,
Los Angeles, CA
90095-1547, USA
3
Physics Institute, University of Szeged,
Dóm tér 9,
Szeged
6723, Hungary
Received:
6
December
2022
Accepted:
23
April
2023
Aims. 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.
Methods. 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.
Results. 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.
Conclusions. 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.
Key words: astronomical databases: miscellaneous / galaxies: star clusters: general / stars: formation
Spectral libraries are available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/674/A135
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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