Three candidate globular clusters discovered in the Galactic bulge

D. Camargo, D. Minniti

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)L90-L94
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume484
Issue number1
DOIs
Publication statusPublished - 21 Mar 2019

Keywords

  • (Galaxy:) bulge
  • catalogues
  • Galaxy: globular clusters: general
  • Galaxy: globular clusters: individual
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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