Three candidate globular clusters discovered in the Galactic bulge
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Archivos
Fecha
2019-03-21
Autores
Camargo, D.
Minniti, D.
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Monthly Notices of the Royal Astronomical Society: Letters
Nombre de Curso
Licencia CC
Licencia CC
Resumen
This work reports the discovery of three new globular clusters (GCs) towards the Galactic bulge - Camargo 1107, 1108, and 1109. The discovery was made using the WISE, 2MASS, VVV, and Gaia-DR2 photometry. The new findings are old (12.0-13.5 Gyr) and metal-poor GCs ([Fe/H] < -1.5 dex) located in the bulge area close to the Milky Way (MW) mid-plane. Although the old ages and low metallicities suggest that the newly discovered GCs are likely associated with the inner halo, the possibility of these clusters being part of a primordial bulge GC subpopulation cannot be ruled out. Camargo 1107, for instance, presents a metallicity of [Fe/H] = -2.2 ± 0.4 dex and an age of 13.5 ± 2 Gyr, which may suggest that this cluster formed just after the big bang in the very early Universe. The discovery of GCs such as the new findings is crucial to built a coherent picture of the inner Galaxy. It is likely that at least a few more dozens of GCs are still to be discovered in the bulge.
Notas
Indexación Scopus
Palabras clave
(Galaxy:) bulge, catalogues, Galaxy: globular clusters: general, Galaxy: globular clusters: individual, surveys
Citación
Monthly Notices of the Royal Astronomical Society: Letters Volume 484, Issue 1, Pages L90 - L94 21 March 2019