Article (Scientific journals)
The Milky Way like galaxy NGC 6384 and its nuclear star cluster at high NIR spatial resolution using LBT/ARGOS commissioning data
Georgiev, Iskren Y.; Neumayer, Nadine; Gässler, Wolfgang et al.
2019In Monthly Notices of the Royal Astronomical Society, 484 (3), p. 3356-3375
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Keywords :
galaxies: nuclei; galaxies: individual: NGC6384; Astrophysics - Astrophysics of Galaxies
Abstract :
[en] 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 Sersić (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_☉, 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Georgiev, Iskren Y.;  Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg
Neumayer, Nadine
Gässler, Wolfgang
Rabien, Sebastian
Busoni, Lorenzo
Bonaglia, Marco
Ziegleder, Julian
Orban De Xivry, Gilles  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Peter, Diethard
Kulas, Martin
Borelli, Jose
Rahmer, Gustavo
Lefebvre, Michael
Baumgardt, Holger
More authors (4 more) Less
Language :
English
Title :
The Milky Way like galaxy NGC 6384 and its nuclear star cluster at high NIR spatial resolution using LBT/ARGOS commissioning data
Publication date :
2019
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
484
Issue :
3
Pages :
3356-3375
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 November 2019

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