And yet it moves: the dangers of artificially fixing the Milky Way center of mass in the presence of a massive large Magellanic Cloud

Autores
Gómez, Facundo A.; Besla, Gurtina; Carpintero, Daniel Diego; Villalobos, Álvaro; O’Shea, Brian W.; Bell, Eric F.
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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 significantly affect the orbit and phase space distribution of tidal debrisfrom 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.
Fil: Gómez, Facundo A.. Gobierno de la Republica Federal de Alemania. Max Planck Institut Fur Astrophysik; Alemania. Michigan State University; Estados Unidos
Fil: Besla, Gurtina. University Of Arizona; Estados Unidos
Fil: Carpintero, Daniel Diego. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Villalobos, Álvaro. Astronomical Observatory of Trieste; Italia
Fil: O’Shea, Brian W.. Michigan State University; Estados Unidos. Joint Institute for Nuclear Astrophysics; Estados Unidos
Fil: Bell, Eric F.. University Of Michigan; Estados Unidos
Materia
Formation of Galaxies
Galaxy
Halos
Numerical Methods
Statistical Methods
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/13776

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spelling And yet it moves: the dangers of artificially fixing the Milky Way center of mass in the presence of a massive large Magellanic CloudGómez, Facundo A.Besla, GurtinaCarpintero, Daniel DiegoVillalobos, ÁlvaroO’Shea, Brian W.Bell, Eric F.Formation of GalaxiesGalaxyHalosNumerical MethodsStatistical Methodshttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1Motivated 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 significantly affect the orbit and phase space distribution of tidal debrisfrom 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.Fil: Gómez, Facundo A.. Gobierno de la Republica Federal de Alemania. Max Planck Institut Fur Astrophysik; Alemania. Michigan State University; Estados UnidosFil: Besla, Gurtina. University Of Arizona; Estados UnidosFil: Carpintero, Daniel Diego. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; ArgentinaFil: Villalobos, Álvaro. Astronomical Observatory of Trieste; ItaliaFil: O’Shea, Brian W.. Michigan State University; Estados Unidos. Joint Institute for Nuclear Astrophysics; Estados UnidosFil: Bell, Eric F.. University Of Michigan; Estados UnidosIop Publishing2015-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/13776Gómez, Facundo A.; Besla, Gurtina; Carpintero, Daniel Diego; Villalobos, Álvaro; O’Shea, Brian W.; et al.; And yet it moves: the dangers of artificially fixing the Milky Way center of mass in the presence of a massive large Magellanic Cloud; Iop Publishing; Astrophysical Journal; 802; 2; 4-2015; 128-1440004-637Xenginfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/802/2/128info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/802/2/128/metainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:39:49Zoai:ri.conicet.gov.ar:11336/13776instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:39:49.77CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv 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 And yet it moves: the dangers of artificially fixing the Milky Way center of mass in the presence of a massive large Magellanic Cloud
spellingShingle And yet it moves: the dangers of artificially fixing the Milky Way center of mass in the presence of a massive large Magellanic Cloud
Gómez, Facundo A.
Formation of Galaxies
Galaxy
Halos
Numerical Methods
Statistical Methods
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
dc.creator.none.fl_str_mv Gómez, Facundo A.
Besla, Gurtina
Carpintero, Daniel Diego
Villalobos, Álvaro
O’Shea, Brian W.
Bell, Eric F.
author Gómez, Facundo A.
author_facet Gómez, Facundo A.
Besla, Gurtina
Carpintero, Daniel Diego
Villalobos, Álvaro
O’Shea, Brian W.
Bell, Eric F.
author_role author
author2 Besla, Gurtina
Carpintero, Daniel Diego
Villalobos, Álvaro
O’Shea, Brian W.
Bell, Eric F.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Formation of Galaxies
Galaxy
Halos
Numerical Methods
Statistical Methods
topic Formation of Galaxies
Galaxy
Halos
Numerical Methods
Statistical Methods
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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 significantly affect the orbit and phase space distribution of tidal debrisfrom 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.
Fil: Gómez, Facundo A.. Gobierno de la Republica Federal de Alemania. Max Planck Institut Fur Astrophysik; Alemania. Michigan State University; Estados Unidos
Fil: Besla, Gurtina. University Of Arizona; Estados Unidos
Fil: Carpintero, Daniel Diego. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Villalobos, Álvaro. Astronomical Observatory of Trieste; Italia
Fil: O’Shea, Brian W.. Michigan State University; Estados Unidos. Joint Institute for Nuclear Astrophysics; Estados Unidos
Fil: Bell, Eric F.. University Of Michigan; Estados Unidos
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 significantly affect the orbit and phase space distribution of tidal debrisfrom 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.
publishDate 2015
dc.date.none.fl_str_mv 2015-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/13776
Gómez, Facundo A.; Besla, Gurtina; Carpintero, Daniel Diego; Villalobos, Álvaro; O’Shea, Brian W.; et al.; And yet it moves: the dangers of artificially fixing the Milky Way center of mass in the presence of a massive large Magellanic Cloud; Iop Publishing; Astrophysical Journal; 802; 2; 4-2015; 128-144
0004-637X
url http://hdl.handle.net/11336/13776
identifier_str_mv Gómez, Facundo A.; Besla, Gurtina; Carpintero, Daniel Diego; Villalobos, Álvaro; O’Shea, Brian W.; et al.; And yet it moves: the dangers of artificially fixing the Milky Way center of mass in the presence of a massive large Magellanic Cloud; Iop Publishing; Astrophysical Journal; 802; 2; 4-2015; 128-144
0004-637X
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/802/2/128
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/802/2/128/meta
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Iop Publishing
publisher.none.fl_str_mv Iop Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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