New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions

The VISTA Variables in the Via Lactea Extended Survey (VVVX) is a public near-IR survey of our Galaxy, continuation of the VVV Survey (http://vvvsurvey.org). We present our latest results on the globular cluster (GC) system of the Milky Way (MW) bulge. In particular, the deep VVVX near-IR images hav...

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Detalles Bibliográficos
Autores principales: Minniti, D., Palma, T., Clariá, J. J.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Ciencias Astronómicas
galaxies: individual (Milky Way)
galaxy: structure
globular clusters: general
stars: evolution
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/167790
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-167790
record_format dspace
spelling I19-R120-10915-1677902024-07-04T20:02:58Z http://sedici.unlp.edu.ar/handle/10915/167790 New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions Minniti, D. Palma, T. Clariá, J. J. 2021 2024-07-04T18:21:14Z en Ciencias Astronómicas galaxies: individual (Milky Way) galaxy: structure globular clusters: general stars: evolution The VISTA Variables in the Via Lactea Extended Survey (VVVX) is a public near-IR survey of our Galaxy, continuation of the VVV Survey (http://vvvsurvey.org). We present our latest results on the globular cluster (GC) system of the Milky Way (MW) bulge. In particular, the deep VVVX near-IR images have allowed the discovery of new GC candidates in the inner MW, previously hidden by heavy extinction and crowding. The deep near-IR PSF photometry and multi-epoch observations also produced millions of variable stars and accurate proper motions. We use RR Lyrae and red clump giants to measure the physical parameters for dozens of new GCs (sizes, extinctions, distances, ages, luminosities, etc.). The VVVX observations of the innermost GCs contribute to characterize the formation and evolution of the MW bulge. The confirmation of new GCs in the bulge is very difficult, and we present a few specific examples. The candidate GC VVV-CL04 was originally discarded, but we confirm this as a real GC. Also, Minni 35 was a discarded candidate GC, but we confirm that this is a young open cluster in the Galactic center region. The VVV survey detected a very reddened GC in the MW plane, VVV-GC003, located beyond the bulge at 13.5 kpc. We also investigate the GCs in the central region of the MW that are severely crowded and obscured, finding that VVV-CL002 is the closest GC to the Galactic Center, with R = 0.7 kpc. Finally, we discovered a dozen GCs in the Sagittarius dwarf galaxy, which is located behind the MW bulge. El VVVX es un survey infrarrojo público de nuestra Galaxia, continuación del mapeo VVV (http://vvvsurvey.org). Presentamos los resultados más recientes sobre el sistema de cúmulos globulares (CGs) de la Vía Láctea. Las imágenes infrarrojas profundas del VVVX permitieron descubrir nuevos candidatos a CGs en las regiones internas de la Galaxia, con elevada absorción interestelar y densidad estelar. Tanto la fotometría profunda como las observaciones en épocas múltiples permitieron detectar millones de variables y medir movimientos propios con precisión. Utilizamos estrellas RR Lyrae y gigantes rojas en los diagramas color-magnitud para medir los parámetros físicos (tamaños, absorciones, distancias, edades, luminosidades) de nuevos CGs. Las observaciones de esos CGs ayudan a caracterizar el proceso de formación y evolución del bulbo Galáctico. La confirmación de la existencia de nuevos CGs en el bulbo constituye una tarea difícil, motivo por el que presentamos acá sólo unos pocos ejemplos específicos. Por ejemplo, confirmamos la realidad física del candidato VVV-CL004, originalmente descartado. Asimismo, si bien Minni 35 fue también antes descartado, lo confirmamos ahora como un cúmulo abierto joven en la región central de nuestra Galaxia. Medimos además VVV-CG003, un CG muy enrojecido ubicado en el plano Galáctico a 13.5 kpc. Hemos investigado también numerosos CGs de la región central de la Galaxia proyectados sobre las zonas más oscurecidas y densas. Encontramos que VVV-CL002 es el CG más cercano al centro Galáctico, con R = 0.7 kpc. Finalmente, descubrimos una docena de CGs en la galaxia enana Sagittarius, más allá del bulbo de la Vía Láctea. Asociación Argentina de Astronomía Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 107-112
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
galaxies: individual (Milky Way)
galaxy: structure
globular clusters: general
stars: evolution
spellingShingle Ciencias Astronómicas
galaxies: individual (Milky Way)
galaxy: structure
globular clusters: general
stars: evolution
Minniti, D.
Palma, T.
Clariá, J. J.
New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions
topic_facet Ciencias Astronómicas
galaxies: individual (Milky Way)
galaxy: structure
globular clusters: general
stars: evolution
description The VISTA Variables in the Via Lactea Extended Survey (VVVX) is a public near-IR survey of our Galaxy, continuation of the VVV Survey (http://vvvsurvey.org). We present our latest results on the globular cluster (GC) system of the Milky Way (MW) bulge. In particular, the deep VVVX near-IR images have allowed the discovery of new GC candidates in the inner MW, previously hidden by heavy extinction and crowding. The deep near-IR PSF photometry and multi-epoch observations also produced millions of variable stars and accurate proper motions. We use RR Lyrae and red clump giants to measure the physical parameters for dozens of new GCs (sizes, extinctions, distances, ages, luminosities, etc.). The VVVX observations of the innermost GCs contribute to characterize the formation and evolution of the MW bulge. The confirmation of new GCs in the bulge is very difficult, and we present a few specific examples. The candidate GC VVV-CL04 was originally discarded, but we confirm this as a real GC. Also, Minni 35 was a discarded candidate GC, but we confirm that this is a young open cluster in the Galactic center region. The VVV survey detected a very reddened GC in the MW plane, VVV-GC003, located beyond the bulge at 13.5 kpc. We also investigate the GCs in the central region of the MW that are severely crowded and obscured, finding that VVV-CL002 is the closest GC to the Galactic Center, with R = 0.7 kpc. Finally, we discovered a dozen GCs in the Sagittarius dwarf galaxy, which is located behind the MW bulge.
format Articulo
Articulo
author Minniti, D.
Palma, T.
Clariá, J. J.
author_facet Minniti, D.
Palma, T.
Clariá, J. J.
author_sort Minniti, D.
title New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions
title_short New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions
title_full New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions
title_fullStr New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions
title_full_unstemmed New Milky Way Bulge Globular Clusters From The VVVX Survey: Open Questions
title_sort new milky way bulge globular clusters from the vvvx survey: open questions
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/167790
work_keys_str_mv AT minnitid newmilkywaybulgeglobularclustersfromthevvvxsurveyopenquestions
AT palmat newmilkywaybulgeglobularclustersfromthevvvxsurveyopenquestions
AT clariajj newmilkywaybulgeglobularclustersfromthevvvxsurveyopenquestions
_version_ 1807223565939900416

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