SMASHing the LMC: Mapping a Ring-like Stellar Overdensity in the LMC Disk

SMASHing the LMC: Mapping a Ring-like Stellar Overdensity in the LMC Disk

We explore the stellar structure of the Large Magellanic Cloud (LMC) disk using data from the Survey of the MAgellanic Stellar History and the Dark Energy Survey. We detect a ring-like stellar overdensity in the red clump star count map at a radius of ∼6° (∼5.2 kpc at the LMC distance) that is conti...

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Veröffentlicht in:The Astrophysical journal 2018-12, Vol.869 (2), p.125
Hauptverfasser: Choi, Yumi, Nidever, David L., Olsen, Knut, Besla, Gurtina, Blum, Robert D., Zaritsky, Dennis, Cioni, Maria-Rosa L., van der Marel, Roeland P., Bell, Eric F., Johnson, L. Clifton, Vivas, A. Katherina, Walker, Alistair R., de Boer, Thomas J. L., Noël, Noelia E. D., Monachesi, Antonela, Gallart, Carme, Monelli, Matteo, Stringfellow, Guy S., Massana, Pol, Martinez-Delgado, David, Muñoz, Ricardo R.
Format: Artikel
Sprache:eng
Schlagworte:
Astrophysics
Dark energy
galaxies: dwarf
galaxies: interactions
galaxies: structure
Magellanic Clouds
Main sequence stars
Mapping
Milky Way
Sky surveys (astronomy)
Spiral wrapping
Star clusters
Stellar age
Stellar populations
Stellar structure
Tidal interaction
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Beschreibung
Zusammenfassung:We explore the stellar structure of the Large Magellanic Cloud (LMC) disk using data from the Survey of the MAgellanic Stellar History and the Dark Energy Survey. We detect a ring-like stellar overdensity in the red clump star count map at a radius of ∼6° (∼5.2 kpc at the LMC distance) that is continuous over ∼270° in position angle and is only limited by the current data coverage. The overdensity shows an amplitude up to 2.5 times higher than that of the underlying smooth disk. This structure might be related to the multiple arms found by de Vaucouleurs. We find that the overdensity shows spatial correlation with intermediate-age star clusters, but not with young (
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aaed1f