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The Fornax 3D project: Thick disks in a cluster environment
- Source :
- Astronomy & Astrophysics, ASTRONOMY & ASTROPHYSICS, Astronomy and Astrophysics (0004-6361), 625, A95, Astronomy and Astrophysics, Astronomy and Astrophysics (0004-6361)
- Publisher :
- EDP Sciences
-
Abstract
- We used deep MUSE observations to perform a stellar-kinematic and population analysis of FCC 153 and FCC 177, two edge-on S0 galaxies in the Fornax cluster. The geometrical definition of the different structural components of these two galaxies allows us to describe the nature of their thick disks. These are both old, relatively metal poor and [Mg/Fe]-enhanced, and their star formation history (SFH) reveals a minor younger component whose chemical properties suggest its later accretion. Moreover, the outer regions of these geometrically defined thick disks show higher values of metallicity and lower values of [Mg/Fe]. These stars probably formed in the thin-disk region and they were dynamically heated to form the flares present in these two galaxies. We propose different formation scenarios for the three populations of these thick disks: in-situ formation, accretion and disk heating. A clear distinction in age is found between the metal poor and [Mg/Fe]-enhanced thick disks (old, $\sim 12-13$ Gyr), and the metal rich and less [Mg/Fe]-enhanced thin disks (young, $\sim 4-5$ Gyr). These two galaxies show signs of relatively recent star formation in their thin disks and nuclear regions. While the thin disks show more continuous SFHs, the nuclei display a rather bursty SFH. These two galaxies are located outside of the densest region of the Fornax cluster where FCC 170 resides. This other edge-on S0 galaxy was studied by \citet{Pinna2019}. We compare and discuss our results with this previous study. The differences between these three galaxies, at different distances from the cluster center, suggest that the environment can have a strong effect on the galaxy evolutionary path.<br />24 pages, 18 figures
- Subjects :
- METALLICITY GRADIENTS
Metallicity
INITIAL MASS FUNCTION
Population
FOS: Physical sciences
Astrophysics
IC 1963 [galaxies individual]
01 natural sciences
individual: NGC1380A [galaxies]
S0 GALAXIES
cD
STELLAR POPULATIONS
0103 physical sciences
kinematics and dynamics [galaxies]
Cluster (physics)
EARLY-TYPE GALAXIES
KINEMATICS
Fornax Cluster
galaxies: elliptical and lenticular
education
EDGE-ON GALAXIES
010303 astronomy & astrophysics
evolution [galaxies]
galaxies: kinematics and dynamics
QC
QB
Physics
education.field_of_study
010308 nuclear & particles physics
Star formation
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Accretion (astrophysics)
Galaxy
Stars
Physics and Astronomy
Space and Planetary Science
galaxies: evolution
galaxies: structure
galaxies: individual: IC 1963
galaxies: individual: NGC 1380A
Astrophysics of Galaxies (astro-ph.GA)
HALO
structure [galaxies]
SPIRAL GALAXIES
NEARBY STARS
elliptical and lenticular [galaxies]
Subjects
Details
- Language :
- English
- ISSN :
- 00046361 and 14320746
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics, ASTRONOMY & ASTROPHYSICS, Astronomy and Astrophysics (0004-6361), 625, A95, Astronomy and Astrophysics, Astronomy and Astrophysics (0004-6361)
- Accession number :
- edsair.doi.dedup.....2100016cee1e03d9a19604e4ce13ef28