SMASHing the LMC: A Tidally Induced Warp in the Outer LMC and a Large-scale Reddening Map

Yumi Choi, David L. Nidever, Knut Olsen, Robert D. Blum, Gurtina Besla, Dennis F Zaritsky, Roeland P. Van Der Marel, Eric F. Bell, Carme Gallart, Maria Rosa L. Cioni, L. Clifton Johnson, A. Katherina Vivas, Abhijit Saha, Thomas J.L. De Boer, Noelia E.D. Noël, Antonela Monachesi, Pol Massana, Blair C. Conn, David Martinez-Delgado, Ricardo R. MuñozGuy S. Stringfellow

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We present a study of the three-dimensional (3D) structure of the Large Magellanic Cloud (LMC) using ∼2.2 million red clump (RC) stars selected from the Survey of the MAgellanic Stellar History. To correct for line-of-sight dust extinction, the intrinsic RC color and magnitude and their radial dependence are carefully measured by using internal nearly dust-free regions. These are then used to construct an accurate 2D reddening map (165 deg2 area with ∼10′ resolution) of the LMC disk and the 3D spatial distribution of RC stars. An inclined disk model is fit to the 2D distance map, yielding a best-fit inclination angle degrees with random errors of ±0.°19 and line-of-nodes position angle degrees with random errors of ±0.°49. These angles vary with galactic radius, indicating that the LMC disk is warped and twisted likely due to the repeated tidal interactions with the Small Magellanic Cloud (SMC). For the first time, our data reveal a significant warp in the southwestern part of the outer disk starting at ρ ∼ 7° that departs from the defined LMC plane up to ∼4 kpc toward the SMC, suggesting that it originated from a strong interaction with the SMC. In addition, the inner disk encompassing the off-centered bar appears to be tilted up to 5°-15° relative to the rest of the LMC disk. These findings on the outer warp and the tilted bar are consistent with the predictions from the Besla et al. simulation of a recent direct collision with the SMC.

Original languageEnglish (US)
Article number90
JournalAstrophysical Journal
Volume866
Issue number2
DOIs
StatePublished - Oct 20 2018

Fingerprint

Magellanic clouds
dust
collision
extinction
clumps
spatial distribution
random errors
history
prediction
simulation
stars
line of sight
inclination
histories
color
collisions
radii
predictions

Keywords

  • galaxies: dwarf
  • galaxies: interactions
  • galaxies: ISM
  • galaxies: structure
  • Magellanic Clouds Supporting material: data behind figures

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

SMASHing the LMC : A Tidally Induced Warp in the Outer LMC and a Large-scale Reddening Map. / Choi, Yumi; Nidever, David L.; Olsen, Knut; Blum, Robert D.; Besla, Gurtina; Zaritsky, Dennis F; Van Der Marel, Roeland P.; Bell, Eric F.; Gallart, Carme; Cioni, Maria Rosa L.; Clifton Johnson, L.; Katherina Vivas, A.; Saha, Abhijit; De Boer, Thomas J.L.; Noël, Noelia E.D.; Monachesi, Antonela; Massana, Pol; Conn, Blair C.; Martinez-Delgado, David; Muñoz, Ricardo R.; Stringfellow, Guy S.

In: Astrophysical Journal, Vol. 866, No. 2, 90, 20.10.2018.

Research output: Contribution to journalArticle

Choi, Y, Nidever, DL, Olsen, K, Blum, RD, Besla, G, Zaritsky, DF, Van Der Marel, RP, Bell, EF, Gallart, C, Cioni, MRL, Clifton Johnson, L, Katherina Vivas, A, Saha, A, De Boer, TJL, Noël, NED, Monachesi, A, Massana, P, Conn, BC, Martinez-Delgado, D, Muñoz, RR & Stringfellow, GS 2018, 'SMASHing the LMC: A Tidally Induced Warp in the Outer LMC and a Large-scale Reddening Map', Astrophysical Journal, vol. 866, no. 2, 90. https://doi.org/10.3847/1538-4357/aae083
Choi, Yumi ; Nidever, David L. ; Olsen, Knut ; Blum, Robert D. ; Besla, Gurtina ; Zaritsky, Dennis F ; Van Der Marel, Roeland P. ; Bell, Eric F. ; Gallart, Carme ; Cioni, Maria Rosa L. ; Clifton Johnson, L. ; Katherina Vivas, A. ; Saha, Abhijit ; De Boer, Thomas J.L. ; Noël, Noelia E.D. ; Monachesi, Antonela ; Massana, Pol ; Conn, Blair C. ; Martinez-Delgado, David ; Muñoz, Ricardo R. ; Stringfellow, Guy S. / SMASHing the LMC : A Tidally Induced Warp in the Outer LMC and a Large-scale Reddening Map. In: Astrophysical Journal. 2018 ; Vol. 866, No. 2.
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