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Title:
The Milky Way like galaxy NGC 6384 and its nuclear star cluster at high NIR spatial resolution using LBT/ARGOS commissioning data
Authors:
Georgiev, Iskren Y.; Neumayer, Nadine; Gässler, Wolfgang; Rabien, Sebastian; Busoni, Lorenzo; Bonaglia, Marco; Ziegleder, Julian; Orban de Xivry, Gilles; Peter, Diethard; Kulas, Martin; Borelli, Jose; Rahmer, Gustavo; Lefebvre, Michael; Baumgardt, Holger
Affiliation:
AA(Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AB(Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AC(Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AD(Max-Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany), AE(Arcetri Astrophysical Observatory, Largo Enrico Fermi 5, I-50125 Florence, Italy), AF(Arcetri Astrophysical Observatory, Largo Enrico Fermi 5, I-50125 Florence, Italy), AG(Max-Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany), AH(Université de Liège, Institut d'Astrophysique et de Géophysique (Bât. B5c), Quartier Agora, Allée du 6 août, 19C, B-4000 Liège 1 (Sart-Tilman), Belgium 0000-0002-4790-415X), AI(Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AJ(Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AK(Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AL(LBT Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721, USA), AM(LBT Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721, USA), AN(University of Queensland, St. Lucia, Brisbane, QLD 4068, Australia 0000-0002-1959-6946)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 484, Issue 3, p.3356-3375 (MNRAS Homepage)
Publication Date:
04/2019
Origin:
OUP
Astronomy Keywords:
galaxies: nuclei; galaxies: individual: NGC6384
Abstract Copyright:
2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stz227
Bibliographic Code:
2019MNRAS.484.3356G

Abstract

We analyse high spatial resolution near infrared (NIR) imaging of NGC 6384, a Milky Way like galaxy, using ARGOS commissioning data at the Large Binocular Telescope (LBT). ARGOS provides a stable PSFFWHM = 0{^''.}2-0{^''.}3 AO correction of the ground layer across the LUCI 2 NIR camera 4 × 4 arcmin field by using six laser guide stars (three per telescope) and a natural guide star for tip-tilt sensing and guiding. Enabled by this high spatial resolution, we analyse the structure of the nuclear star cluster (NSC) and the central kiloparsec of NGC 6384. We find via 2D modelling that the NSC (reff ~= 10 pc) is surrounded by a small (reff ~= 100 pc) and a larger Sersic (reff ~= 400 pc), all embedded within the NGC 6384 large-scale boxy/X-shaped bulge and disc. This proof-of-concept study shows that with the high spatial resolution achieved by ground-layer AO we can push such analysis to distances previously only accessible from space. SED-fitting to the NIR and optical HST photometry allowed to leverage the age-metallicity-extinction degeneracies and derive the effective NSC properties of an young to old population mass ratio of 8 per cent with M_{\star ,old} ˜eq 3.5× 10^7 M_&sun;, Ageold, young = 10.9 ± 1.3 Gyr and 226 Myr ± 62 per cent, metallicity [M/H] = -0.11 ± 0.16, and 0.33± 39 per cent dex, and E(B - V) = 0.63 and 1.44 mag.
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