VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge

Autores
McDonald, I.; Zijlstra, A. A.; Sloan, G. C.; Kerins, E. J.; Lagadec, E.; Minniti, Dante; Santucho, María Victoria; Gurovich, Sebastian; Dominguez Romero, Mariano Javier de Leon
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present the deepest near-infrared (ZJKs) photometry yet obtained of the Sagittarius dwarf spheroidal (Sgr dSph), using Visible and Infrared Survey Telescope for Astronomy (VISTA) to survey 11 square degrees centred on its core. We list locations and ZJKs-band magnitudes for over 2.9 million sources in the field. We discuss the isolation of the Sgr dSph from the foreground and Galactic Bulge populations, identify the Sgr dSph's horizontal branch in the near-infrared for the first time and map the density of the galaxy's stars. We present isochrones for the Sgr dSph and Bulge populations. These are consistent with the previously reported properties of the Sgr dSph core: namely that it is dominated by a population between [Fe/H] ≈ −1 dex and solar, with a significant [α/Fe] versus [Fe/H] gradient. While strong contamination from the Galactic Bulge prevents accurate measurement of the (Galactic) north side of the Sgr dSph, the dwarf galaxy can be well approximated by a roughly ovaloid projection of characteristic size 4° × 2°, beyond which the projected stellar density is less than half that of the region surrounding the core. The galaxy's major axis is perpendicular to the Galactic Plane, as in previous studies. We find slight evidence to confirm a metallicity gradient in the Sgr dSph and use isochrones to fit a distance of 24.3 ± 2.3 kpc. We were unable to fully constrain the metallicity distribution of the Sgr dSph due to the Bulge contamination and strong correlation of [α/Fe] with metallicity; however, we find that metal-poor stars ([Fe/H] ≲ −1) make up ≲29 per cent of the Sgr dSph's upper red giant branch population. The Bulge population is best fitted by a younger population with [Fe/H] ≈ 0 and [α/Fe] ≈ 0 or slightly higher. We find no evidence for a split, peanut- or X-shaped Bulge population in this line of sight (l = 5$ $_{.}^{\circ}$$6 ± ∼1°, b = −14$ $_{.}^{\circ}$$1 ± ∼3°).
Fil: McDonald, I.. Jodrell Bank Centre for Astrophysics; Reino Unido
Fil: Zijlstra, A. A.. Jodrell Bank Centre for Astrophysics; Reino Unido
Fil: Sloan, G. C.. Cornell University; Estados Unidos
Fil: Kerins, E. J.. Jodrell Bank Centre for Astrophysics; Reino Unido
Fil: Lagadec, E.. Cornell University; Estados Unidos
Fil: Minniti, Dante. Pontificia Universidad Católica de Chile; Chile
Fil: Santucho, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
Fil: Gurovich, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
Fil: Dominguez Romero, Mariano Javier de Leon. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
Materia
stars: late type
stars: post-AGB
stars: evolution
stars: fundamental parameters
Galaxy: bulge
Galaxies: individual
Galaxies: Sgr dSph
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:11336/26997
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic BulgeMcDonald, I.Zijlstra, A. A.Sloan, G. C.Kerins, E. J.Lagadec, E.Minniti, DanteSantucho, María VictoriaGurovich, SebastianDominguez Romero, Mariano Javier de Leonstars: late typestars: post-AGBstars: evolutionstars: fundamental parametersGalaxy: bulgeGalaxies: individualGalaxies: Sgr dSphWe present the deepest near-infrared (ZJKs) photometry yet obtained of the Sagittarius dwarf spheroidal (Sgr dSph), using Visible and Infrared Survey Telescope for Astronomy (VISTA) to survey 11 square degrees centred on its core. We list locations and ZJKs-band magnitudes for over 2.9 million sources in the field. We discuss the isolation of the Sgr dSph from the foreground and Galactic Bulge populations, identify the Sgr dSph's horizontal branch in the near-infrared for the first time and map the density of the galaxy's stars. We present isochrones for the Sgr dSph and Bulge populations. These are consistent with the previously reported properties of the Sgr dSph core: namely that it is dominated by a population between [Fe/H] ≈ −1 dex and solar, with a significant [α/Fe] versus [Fe/H] gradient. While strong contamination from the Galactic Bulge prevents accurate measurement of the (Galactic) north side of the Sgr dSph, the dwarf galaxy can be well approximated by a roughly ovaloid projection of characteristic size 4° × 2°, beyond which the projected stellar density is less than half that of the region surrounding the core. The galaxy's major axis is perpendicular to the Galactic Plane, as in previous studies. We find slight evidence to confirm a metallicity gradient in the Sgr dSph and use isochrones to fit a distance of 24.3 ± 2.3 kpc. We were unable to fully constrain the metallicity distribution of the Sgr dSph due to the Bulge contamination and strong correlation of [α/Fe] with metallicity; however, we find that metal-poor stars ([Fe/H] ≲ −1) make up ≲29 per cent of the Sgr dSph's upper red giant branch population. The Bulge population is best fitted by a younger population with [Fe/H] ≈ 0 and [α/Fe] ≈ 0 or slightly higher. We find no evidence for a split, peanut- or X-shaped Bulge population in this line of sight (l = 5$ $_{.}^{\circ}$$6 ± ∼1°, b = −14$ $_{.}^{\circ}$$1 ± ∼3°).Fil: McDonald, I.. Jodrell Bank Centre for Astrophysics; Reino UnidoFil: Zijlstra, A. A.. Jodrell Bank Centre for Astrophysics; Reino UnidoFil: Sloan, G. C.. Cornell University; Estados UnidosFil: Kerins, E. J.. Jodrell Bank Centre for Astrophysics; Reino UnidoFil: Lagadec, E.. Cornell University; Estados UnidosFil: Minniti, Dante. Pontificia Universidad Católica de Chile; ChileFil: Santucho, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; ArgentinaFil: Gurovich, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; ArgentinaFil: Dominguez Romero, Mariano Javier de Leon. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; ArgentinaOxford University Press2013-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/26997McDonald, I.; Zijlstra, A. A.; Sloan, G. C.; Kerins, E. J.; Lagadec, E.; et al.; VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 436; 1; 9-2013; 413-4290035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stt1576info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/436/1/413/973089/VISTA-s-view-of-the-Sagittarius-dwarf-spheroidalinfo:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1308.4323info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:04:06Zoai:ri.conicet.gov.ar:11336/26997instacron: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 10:04:06.925CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
title VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
spellingShingle VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
McDonald, I.
stars: late type
stars: post-AGB
stars: evolution
stars: fundamental parameters
Galaxy: bulge
Galaxies: individual
Galaxies: Sgr dSph
title_short VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
title_full VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
title_fullStr VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
title_full_unstemmed VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
title_sort VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge
dc.creator.none.fl_str_mv McDonald, I.
Zijlstra, A. A.
Sloan, G. C.
Kerins, E. J.
Lagadec, E.
Minniti, Dante
Santucho, María Victoria
Gurovich, Sebastian
Dominguez Romero, Mariano Javier de Leon
author McDonald, I.
author_facet McDonald, I.
Zijlstra, A. A.
Sloan, G. C.
Kerins, E. J.
Lagadec, E.
Minniti, Dante
Santucho, María Victoria
Gurovich, Sebastian
Dominguez Romero, Mariano Javier de Leon
author_role author
author2 Zijlstra, A. A.
Sloan, G. C.
Kerins, E. J.
Lagadec, E.
Minniti, Dante
Santucho, María Victoria
Gurovich, Sebastian
Dominguez Romero, Mariano Javier de Leon
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv stars: late type
stars: post-AGB
stars: evolution
stars: fundamental parameters
Galaxy: bulge
Galaxies: individual
Galaxies: Sgr dSph
topic stars: late type
stars: post-AGB
stars: evolution
stars: fundamental parameters
Galaxy: bulge
Galaxies: individual
Galaxies: Sgr dSph
dc.description.none.fl_txt_mv We present the deepest near-infrared (ZJKs) photometry yet obtained of the Sagittarius dwarf spheroidal (Sgr dSph), using Visible and Infrared Survey Telescope for Astronomy (VISTA) to survey 11 square degrees centred on its core. We list locations and ZJKs-band magnitudes for over 2.9 million sources in the field. We discuss the isolation of the Sgr dSph from the foreground and Galactic Bulge populations, identify the Sgr dSph's horizontal branch in the near-infrared for the first time and map the density of the galaxy's stars. We present isochrones for the Sgr dSph and Bulge populations. These are consistent with the previously reported properties of the Sgr dSph core: namely that it is dominated by a population between [Fe/H] ≈ −1 dex and solar, with a significant [α/Fe] versus [Fe/H] gradient. While strong contamination from the Galactic Bulge prevents accurate measurement of the (Galactic) north side of the Sgr dSph, the dwarf galaxy can be well approximated by a roughly ovaloid projection of characteristic size 4° × 2°, beyond which the projected stellar density is less than half that of the region surrounding the core. The galaxy's major axis is perpendicular to the Galactic Plane, as in previous studies. We find slight evidence to confirm a metallicity gradient in the Sgr dSph and use isochrones to fit a distance of 24.3 ± 2.3 kpc. We were unable to fully constrain the metallicity distribution of the Sgr dSph due to the Bulge contamination and strong correlation of [α/Fe] with metallicity; however, we find that metal-poor stars ([Fe/H] ≲ −1) make up ≲29 per cent of the Sgr dSph's upper red giant branch population. The Bulge population is best fitted by a younger population with [Fe/H] ≈ 0 and [α/Fe] ≈ 0 or slightly higher. We find no evidence for a split, peanut- or X-shaped Bulge population in this line of sight (l = 5$ $_{.}^{\circ}$$6 ± ∼1°, b = −14$ $_{.}^{\circ}$$1 ± ∼3°).
Fil: McDonald, I.. Jodrell Bank Centre for Astrophysics; Reino Unido
Fil: Zijlstra, A. A.. Jodrell Bank Centre for Astrophysics; Reino Unido
Fil: Sloan, G. C.. Cornell University; Estados Unidos
Fil: Kerins, E. J.. Jodrell Bank Centre for Astrophysics; Reino Unido
Fil: Lagadec, E.. Cornell University; Estados Unidos
Fil: Minniti, Dante. Pontificia Universidad Católica de Chile; Chile
Fil: Santucho, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
Fil: Gurovich, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
Fil: Dominguez Romero, Mariano Javier de Leon. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
description We present the deepest near-infrared (ZJKs) photometry yet obtained of the Sagittarius dwarf spheroidal (Sgr dSph), using Visible and Infrared Survey Telescope for Astronomy (VISTA) to survey 11 square degrees centred on its core. We list locations and ZJKs-band magnitudes for over 2.9 million sources in the field. We discuss the isolation of the Sgr dSph from the foreground and Galactic Bulge populations, identify the Sgr dSph's horizontal branch in the near-infrared for the first time and map the density of the galaxy's stars. We present isochrones for the Sgr dSph and Bulge populations. These are consistent with the previously reported properties of the Sgr dSph core: namely that it is dominated by a population between [Fe/H] ≈ −1 dex and solar, with a significant [α/Fe] versus [Fe/H] gradient. While strong contamination from the Galactic Bulge prevents accurate measurement of the (Galactic) north side of the Sgr dSph, the dwarf galaxy can be well approximated by a roughly ovaloid projection of characteristic size 4° × 2°, beyond which the projected stellar density is less than half that of the region surrounding the core. The galaxy's major axis is perpendicular to the Galactic Plane, as in previous studies. We find slight evidence to confirm a metallicity gradient in the Sgr dSph and use isochrones to fit a distance of 24.3 ± 2.3 kpc. We were unable to fully constrain the metallicity distribution of the Sgr dSph due to the Bulge contamination and strong correlation of [α/Fe] with metallicity; however, we find that metal-poor stars ([Fe/H] ≲ −1) make up ≲29 per cent of the Sgr dSph's upper red giant branch population. The Bulge population is best fitted by a younger population with [Fe/H] ≈ 0 and [α/Fe] ≈ 0 or slightly higher. We find no evidence for a split, peanut- or X-shaped Bulge population in this line of sight (l = 5$ $_{.}^{\circ}$$6 ± ∼1°, b = −14$ $_{.}^{\circ}$$1 ± ∼3°).
publishDate 2013
dc.date.none.fl_str_mv 2013-09
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/11336/26997
McDonald, I.; Zijlstra, A. A.; Sloan, G. C.; Kerins, E. J.; Lagadec, E.; et al.; VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 436; 1; 9-2013; 413-429
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/26997
identifier_str_mv McDonald, I.; Zijlstra, A. A.; Sloan, G. C.; Kerins, E. J.; Lagadec, E.; et al.; VISTA’s view of the Sagittarius dwarf spheroidal galaxy and southern Galactic Bulge; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 436; 1; 9-2013; 413-429
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stt1576
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/436/1/413/973089/VISTA-s-view-of-the-Sagittarius-dwarf-spheroidal
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1308.4323
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
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
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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score 13.070432

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