Spiral structure of the third galactic quadrant and the solution to the Canis Major debate

Autores
Moitinho, A.; Vazquez, Ruben Angel; Carraro, Giovanni; Baume, Gustavo Luis; Giorgi, Edgard Ervar Salvador; Lyra, W.
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
With the discoveryofthe Sagittarius dwarf spheroidal, agalaxy caughtinthe processofmerging with the Milky Way, the hunt for other such accretion events has become a very active field of astrophysical research. The identification of a stellar ring-like structure in Monoceros, spanning more than 100°, and the detection of an overdensity of stars in the direction of the constellation of Canis Major (CMa), apparently associated to the ring, has led to the widespread belief that a second galaxy being cannibalized by the Milky Way had been found. In this scenario, the overdensity would be the remaining core of the disrupted galaxy and the ring would be the tidal debris left behind. However, unlike the Sagittarius dwarf, which is well below the Galactic plane and whose orbit, and thus tidal tail, is nearly perpendicular to the plane of the Milky Way, the putative CMa galaxy and ring are nearly co-planar with the Galactic disc. This severely complicates the interpretation of observations. In this Letter, we show that our new description of the Milky Way leads to a completely different picture. We argue that the Norma-Cygnus spiral arm defines a distant stellar ring crossing Monoceros and the overdensity is simply a projection effect of looking along the nearby local arm. Our perspective sheds new light on a very poorly known region, the third Galactic quadrant, where CMa is located. © 2006 The Authors. Journal compilation © 2006 RAS.
Fil: Moitinho, A.. Centro de Astronomia E Astrofisica Da Universidade de Lisboa; Portugal
Fil: Vazquez, Ruben Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Carraro, Giovanni. Universidad de Chile; Chile. University of Yale; Estados Unidos
Fil: Baume, Gustavo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Giorgi, Edgard Ervar Salvador. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Lyra, W.. Uppsala Astronomical Observatory; Suecia
Materia
GALAXIES: DWARF
GALAXY: STELLAR CONTENT
GALAXY: STRUCTURE
OPEN CLUSTERS AND ASSOCIATIONS: GENERAL
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:11336/39309
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Spiral structure of the third galactic quadrant and the solution to the Canis Major debateMoitinho, A.Vazquez, Ruben AngelCarraro, GiovanniBaume, Gustavo LuisGiorgi, Edgard Ervar SalvadorLyra, W.GALAXIES: DWARFGALAXY: STELLAR CONTENTGALAXY: STRUCTUREOPEN CLUSTERS AND ASSOCIATIONS: GENERALhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1With the discoveryofthe Sagittarius dwarf spheroidal, agalaxy caughtinthe processofmerging with the Milky Way, the hunt for other such accretion events has become a very active field of astrophysical research. The identification of a stellar ring-like structure in Monoceros, spanning more than 100°, and the detection of an overdensity of stars in the direction of the constellation of Canis Major (CMa), apparently associated to the ring, has led to the widespread belief that a second galaxy being cannibalized by the Milky Way had been found. In this scenario, the overdensity would be the remaining core of the disrupted galaxy and the ring would be the tidal debris left behind. However, unlike the Sagittarius dwarf, which is well below the Galactic plane and whose orbit, and thus tidal tail, is nearly perpendicular to the plane of the Milky Way, the putative CMa galaxy and ring are nearly co-planar with the Galactic disc. This severely complicates the interpretation of observations. In this Letter, we show that our new description of the Milky Way leads to a completely different picture. We argue that the Norma-Cygnus spiral arm defines a distant stellar ring crossing Monoceros and the overdensity is simply a projection effect of looking along the nearby local arm. Our perspective sheds new light on a very poorly known region, the third Galactic quadrant, where CMa is located. © 2006 The Authors. Journal compilation © 2006 RAS.Fil: Moitinho, A.. Centro de Astronomia E Astrofisica Da Universidade de Lisboa; PortugalFil: Vazquez, Ruben Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Carraro, Giovanni. Universidad de Chile; Chile. University of Yale; Estados UnidosFil: Baume, Gustavo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Giorgi, Edgard Ervar Salvador. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Lyra, W.. Uppsala Astronomical Observatory; SueciaWiley Blackwell Publishing, Inc2006-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/39309Moitinho, A.; Vazquez, Ruben Angel; Carraro, Giovanni; Baume, Gustavo Luis; Giorgi, Edgard Ervar Salvador; et al.; Spiral structure of the third galactic quadrant and the solution to the Canis Major debate; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society: Letters; 368; 1; 5-20061745-3933CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1745-3933.2006.00163.xinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnrasl/article/368/1/L77/959430info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:09:01Zoai:ri.conicet.gov.ar:11336/39309instacron: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:34982025-10-22 11:09:01.76CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
title Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
spellingShingle Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
Moitinho, A.
GALAXIES: DWARF
GALAXY: STELLAR CONTENT
GALAXY: STRUCTURE
OPEN CLUSTERS AND ASSOCIATIONS: GENERAL
title_short Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
title_full Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
title_fullStr Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
title_full_unstemmed Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
title_sort Spiral structure of the third galactic quadrant and the solution to the Canis Major debate
dc.creator.none.fl_str_mv Moitinho, A.
Vazquez, Ruben Angel
Carraro, Giovanni
Baume, Gustavo Luis
Giorgi, Edgard Ervar Salvador
Lyra, W.
author Moitinho, A.
author_facet Moitinho, A.
Vazquez, Ruben Angel
Carraro, Giovanni
Baume, Gustavo Luis
Giorgi, Edgard Ervar Salvador
Lyra, W.
author_role author
author2 Vazquez, Ruben Angel
Carraro, Giovanni
Baume, Gustavo Luis
Giorgi, Edgard Ervar Salvador
Lyra, W.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv GALAXIES: DWARF
GALAXY: STELLAR CONTENT
GALAXY: STRUCTURE
OPEN CLUSTERS AND ASSOCIATIONS: GENERAL
topic GALAXIES: DWARF
GALAXY: STELLAR CONTENT
GALAXY: STRUCTURE
OPEN CLUSTERS AND ASSOCIATIONS: GENERAL
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv With the discoveryofthe Sagittarius dwarf spheroidal, agalaxy caughtinthe processofmerging with the Milky Way, the hunt for other such accretion events has become a very active field of astrophysical research. The identification of a stellar ring-like structure in Monoceros, spanning more than 100°, and the detection of an overdensity of stars in the direction of the constellation of Canis Major (CMa), apparently associated to the ring, has led to the widespread belief that a second galaxy being cannibalized by the Milky Way had been found. In this scenario, the overdensity would be the remaining core of the disrupted galaxy and the ring would be the tidal debris left behind. However, unlike the Sagittarius dwarf, which is well below the Galactic plane and whose orbit, and thus tidal tail, is nearly perpendicular to the plane of the Milky Way, the putative CMa galaxy and ring are nearly co-planar with the Galactic disc. This severely complicates the interpretation of observations. In this Letter, we show that our new description of the Milky Way leads to a completely different picture. We argue that the Norma-Cygnus spiral arm defines a distant stellar ring crossing Monoceros and the overdensity is simply a projection effect of looking along the nearby local arm. Our perspective sheds new light on a very poorly known region, the third Galactic quadrant, where CMa is located. © 2006 The Authors. Journal compilation © 2006 RAS.
Fil: Moitinho, A.. Centro de Astronomia E Astrofisica Da Universidade de Lisboa; Portugal
Fil: Vazquez, Ruben Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Carraro, Giovanni. Universidad de Chile; Chile. University of Yale; Estados Unidos
Fil: Baume, Gustavo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Giorgi, Edgard Ervar Salvador. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Lyra, W.. Uppsala Astronomical Observatory; Suecia
description With the discoveryofthe Sagittarius dwarf spheroidal, agalaxy caughtinthe processofmerging with the Milky Way, the hunt for other such accretion events has become a very active field of astrophysical research. The identification of a stellar ring-like structure in Monoceros, spanning more than 100°, and the detection of an overdensity of stars in the direction of the constellation of Canis Major (CMa), apparently associated to the ring, has led to the widespread belief that a second galaxy being cannibalized by the Milky Way had been found. In this scenario, the overdensity would be the remaining core of the disrupted galaxy and the ring would be the tidal debris left behind. However, unlike the Sagittarius dwarf, which is well below the Galactic plane and whose orbit, and thus tidal tail, is nearly perpendicular to the plane of the Milky Way, the putative CMa galaxy and ring are nearly co-planar with the Galactic disc. This severely complicates the interpretation of observations. In this Letter, we show that our new description of the Milky Way leads to a completely different picture. We argue that the Norma-Cygnus spiral arm defines a distant stellar ring crossing Monoceros and the overdensity is simply a projection effect of looking along the nearby local arm. Our perspective sheds new light on a very poorly known region, the third Galactic quadrant, where CMa is located. © 2006 The Authors. Journal compilation © 2006 RAS.
publishDate 2006
dc.date.none.fl_str_mv 2006-05
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/11336/39309
Moitinho, A.; Vazquez, Ruben Angel; Carraro, Giovanni; Baume, Gustavo Luis; Giorgi, Edgard Ervar Salvador; et al.; Spiral structure of the third galactic quadrant and the solution to the Canis Major debate; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society: Letters; 368; 1; 5-2006
1745-3933
CONICET Digital
CONICET
url http://hdl.handle.net/11336/39309
identifier_str_mv Moitinho, A.; Vazquez, Ruben Angel; Carraro, Giovanni; Baume, Gustavo Luis; Giorgi, Edgard Ervar Salvador; et al.; Spiral structure of the third galactic quadrant and the solution to the Canis Major debate; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society: Letters; 368; 1; 5-2006
1745-3933
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1745-3933.2006.00163.x
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnrasl/article/368/1/L77/959430
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
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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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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