A globular cluster in the dwarf galaxy Sextans B

Abstract

We present spectroscopic observations of a massive globular cluster in the dwarf irregular galaxy Sextans B, discovered by us on Hubble Space Telescope Wide Field and Planetary Camera 2 (HST WFPC2) images. Long-slit spectra were obtained with the SCORPIO spectrograph on the the 6-m telescope at the Special Astrophysical observatory of the Russian Academy of Sciences. We determine age, metallicity and alpha-element abundance ratio for the globular cluster to be $2\pm 1$ Gyr, $-1.35\pm 0.25$ dex, and $0.1\pm 0.1$ dex, respectively. Main photometric and structural parameters of it were determined using our surface photometry on the HST images. The mass ($\sim 10^5 M \sun$), luminosity and structural parameters appear to be typical for the globular clusters in our own Galaxy. Our findings shed a new light on the evolutionary history of Sextans B.

13 pages, 4 figures, 3 tables, Astrophysical Bulletin, accepted

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• The extended structure of the dwarf irregular galaxies Sextans A and Sextans B. Signatures of tidal distortion in the outskirts of the Local Group
• DDO216-A1: a central globular cluster in a low-luminosity transition type galaxy
• SAO-6m Telescope Spectroscopic Observations of Globular Clusters in Nearby Galaxies
• LBT/MODS spectroscopy of globular clusters in the irregular galaxy NGC 4449
• A nearby isolated dwarf: star formation and structure of ESO 006-001
• TRAPUM pulsar and transient search in the Sextans A and B galaxies and discovery of background FRB 20210924D