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| DOI | 10.3847/0004-637X/825/1/20 | ||||
| Año | 2016 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We present deep optical images of the Large and Small Magellanic Clouds (LMC and SMC) using a low cost telephoto lens with a wide field of view to explore stellar substructure in the outskirts of the stellar disk of the LMC (< 10 degrees from the LMC center). These data have higher resolution than existing star count maps, and highlight the existence of stellar arcs and multiple spiral arms in the northern periphery, with no comparable counterparts in the south. We compare these data to detailed simulations of the LMC disk outskirts, following interactions with its low mass companion, the SMC. We consider interaction in isolation and with the inclusion of the Milky Way tidal field. The simulations are used to assess the origin of the northern structures, including also the low density stellar arc recently identified in the Dark Energy Survey data by Mackey et al. at similar to 15 degrees. We conclude that repeated close interactions with the SMC are primarily responsible for the asymmetric stellar structures seen in the periphery of the LMC. The orientation and density of these arcs can be used to constrain the LMC's interaction history with and impact parameter of the SMC. More generally, we find that such asymmetric structures should be ubiquitous about pairs of dwarfs and can persist for 1-2 Gyr even after the secondary merges entirely with the primary. As such, the lack of a companion around a Magellanic Irregular does not disprove the hypothesis that their asymmetric structures are driven by dwarf-dwarf interactions.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Besla, Gurtina | - |
UNIV ARIZONA - Estados Unidos
The University of Arizona - Estados Unidos |
| 2 | Martinez-Delgado, D. | Hombre |
Heidelberg Univ - Alemania
Astronomisches Rechen-Institut Heidelberg - Alemania Astronomisches Rechen-Institut - Alemania |
| 3 | van der Marel, R. P. | Hombre |
Space Telescope Sci Inst - Estados Unidos
STScI - Estados Unidos Space Telescope Science Institute - Estados Unidos |
| 4 | Beletsky, Y. | Hombre |
Carnegie Inst Sci - Chile
|
| 5 | Seibert, Mark | Hombre |
Observatorio Las Campanas - Estados Unidos
Carnegie Observ - Estados Unidos |
| 6 | Schlafly, Edward | Hombre |
Lawrence Berkeley Natl Lab - Estados Unidos
Lawrence Berkeley National Laboratory - Estados Unidos |
| 7 | Baran, Andrzej S. | Hombre |
Heidelberg Univ - Alemania
Astronomisches Rechen-Institut Heidelberg - Alemania |
| 8 | Neyer, Fabian | Hombre |
ETH - Suiza
ETH Zurich - Suiza |
| Fuente |
|---|
| National Science Foundation |
| Deutsche Forschungsgemeinschaft |
| NASA |
| National Aeronautics and Space Administration |
| NASA through Space Telescope Science Institute |
| NASA through Hubble Fellowship - Space Telescope Science Institute |
| Space Telescope Science Institute |
| FAS Science Division Research Computing Group at Harvard University |
| NASA contract |
| Sonderforschungsbereich (SFB) "The Milky Way System" of the German Research Foundation (DFG) |
| HST AR grant |
| Directorate for Mathematical and Physical Sciences |
| Dougal Mackey and David Schminovich |
| HST AR |
| Agradecimiento |
|---|
| We thank Dougal Mackey and David Schminovich for useful conversation that have improved this manuscript. GB acknowledges support through HST AR grant # 12632. Support for program # 12632 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. DMD and EKG acknowledge support by Sonderforschungsbereich (SFB) 881 "The Milky Way System" of the German Research Foundation (DFG), particularly through subproject A2. ES acknowledges support for this work provided by NASA through Hubble Fellowship grant HST-HF2-51367.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. This paper is based on observations made at the La Silla Paranal Observatory. The simulations in this paper were produced on the Odyssey cluster supported by the FAS Science Division Research Computing Group at Harvard University. Analysis was undertaken on the El Gato cluster at the University of Arizona, which is supported by the National Science Foundation under Grant No. 1228509. |
| We thank Dougal Mackey and David Schminovich for useful conversation that have improved this manuscript. GB acknowledges support through HST AR grant #12632. Support for program #12632 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. DMD and EKG acknowledge support by Sonderforschungsbereich (SFB) 881 "The Milky Way System" of the German Research Foundation (DFG), particularly through subproject A2. ES acknowledges support for this work provided by NASA through Hubble Fellowship grant HST-HF2-51367.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. This paper is based on observations made at the La Silla Paranal Observatory. The simulations in this paper were produced on the Odyssey cluster supported by the FAS Science Division Research Computing Group at Harvard University. Analysis was undertaken on the El Gato cluster at the University of Arizona, which is supported by the National Science Foundation under Grant No. 1228509. |