And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive large magellanic cloud

Motivated by recent studies suggesting that the Large Magellanic Cloud (LMC) could be significantly more massive than previously thought, we explore whether the approximation of an inertial Galactocentric reference frame is still valid in the presence of such a massive LMC. We find that previous est...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Gómez, F. A., Besla, G., Carpintero, Daniel Diego, Villalobos, Á., O'Shea, B. W., Bell, E. F.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Astronómicas
Galaxies: formation
Galaxy: formation
Galaxy: halo
Methods: analytical
Methods: numerical
Methods: statistical
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86406
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86406
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: formation
Galaxy: formation
Galaxy: halo
Methods: analytical
Methods: numerical
Methods: statistical
spellingShingle Ciencias Astronómicas
Galaxies: formation
Galaxy: formation
Galaxy: halo
Methods: analytical
Methods: numerical
Methods: statistical
Gómez, F. A.
Besla, G.
Carpintero, Daniel Diego
Villalobos, Á.
O'Shea, B. W.
Bell, E. F.
And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive large magellanic cloud
topic_facet Ciencias Astronómicas
Galaxies: formation
Galaxy: formation
Galaxy: halo
Methods: analytical
Methods: numerical
Methods: statistical
description Motivated by recent studies suggesting that the Large Magellanic Cloud (LMC) could be significantly more massive than previously thought, we explore whether the approximation of an inertial Galactocentric reference frame is still valid in the presence of such a massive LMC. We find that previous estimates of the LMC's orbital period and apocentric distance derived assuming a fixed Milky Way (MW) are significantly shortened for models where the MW is allowed to move freely in response to the gravitational pull of the LMC. Holding other parameters fixed, the fraction of models favoring first infall is reduced. Due to this interaction, the MW center of mass within the inner 50 kpc can be significantly displaced in phase-space in a very short period of time that ranges from 0.3 to 0.5 Gyr by as much as 30 kpc and 75 km s -1 . Furthermore, we show that the gravitational pull of the LMC and response of the MW are likely to signi ficantly affect the orbit and phase space distribution of tidal debris from the Sagittarius dwarf galaxy (Sgr). Such effects are larger than previous estimates based on the torque of the LMC alone. As a result, Sgr deposits debris in regions of the sky that are not aligned with the present-day Sgr orbital plane. In addition, we find that properly accounting for the movement of the MW around its common center of mass with the LMC significantly modifies the angular distance between apocenters and tilts its orbital pole, alleviating tensions between previous models and observations. While these models are preliminary in nature, they highlight the central importance of accounting for the mutual gravitational interaction between the MW and LMC when modeling the kinematics of objects in the MW and Local Group.
format Articulo
Articulo
author Gómez, F. A.
Besla, G.
Carpintero, Daniel Diego
Villalobos, Á.
O'Shea, B. W.
Bell, E. F.
author_facet Gómez, F. A.
Besla, G.
Carpintero, Daniel Diego
Villalobos, Á.
O'Shea, B. W.
Bell, E. F.
author_sort Gómez, F. A.
title And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive large magellanic cloud
title_short And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive large magellanic cloud
title_full And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive large magellanic cloud
title_fullStr And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive large magellanic cloud
title_full_unstemmed And yet it moves: The dangers of artificially fixing the Milky Way center of mass in the presence of a massive large magellanic cloud
title_sort and yet it moves: the dangers of artificially fixing the milky way center of mass in the presence of a massive large magellanic cloud
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86406
work_keys_str_mv AT gomezfa andyetitmovesthedangersofartificiallyfixingthemilkywaycenterofmassinthepresenceofamassivelargemagellaniccloud
AT beslag andyetitmovesthedangersofartificiallyfixingthemilkywaycenterofmassinthepresenceofamassivelargemagellaniccloud
AT carpinterodanieldiego andyetitmovesthedangersofartificiallyfixingthemilkywaycenterofmassinthepresenceofamassivelargemagellaniccloud
AT villalobosa andyetitmovesthedangersofartificiallyfixingthemilkywaycenterofmassinthepresenceofamassivelargemagellaniccloud
AT osheabw andyetitmovesthedangersofartificiallyfixingthemilkywaycenterofmassinthepresenceofamassivelargemagellaniccloud
AT bellef andyetitmovesthedangersofartificiallyfixingthemilkywaycenterofmassinthepresenceofamassivelargemagellaniccloud
bdutipo_str Repositorios
_version_ 1764820489656598528

Ejemplares similares