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The MATLAS deep imaging survey has uncovered a plethora of dwarf galaxies inthe low density environment it has mapped. A fraction of them are unusuallyextended and have a low-surface brightness. Among these so-called ultra-diffusegalaxies, a few seem to host an excess of globular clusters. With theintegral-field unit spectrograph MUSE we have observed one of these galaxies -MATLAS J15052031+0148447 (MATLAS-2019) - located towards the nearby group NGC5846 and measured its systemic velocity,age, and metallicity, and that of itsglobular clusters candidates. For the stellar body of MATLAS-2019 we derive ametallicity of -1.33+0.19-0.01 dex and an age of 11.2+1.8-0.8 Gyr. For some ofthe individual GCs and the stacked GC population, we derive consistent ages andmetallicities. From the 11 confirmed globular clusters and using a Markov ChainMonte Carlo approach we derived a dynamical mass-to-light ratio of4.2+8.6-3.4M/L. This is at the lower end of the luminosity-mass scalingrelation defined by the Local Group dwarf galaxies. Furthermore, we couldn'tconfirm nor reject the possibility of a rotational component of the GC system.If present, this would further modify the inferred mass. Follow-up observationsof the globular cluster population and of the stellar body of the galaxy areneeded to assess whether this galaxy is lacking dark matter like it wassuggested for the pair of dwarf galaxies in the field of NGC 1052, or if thisis a miss-interpretation arising from systematic uncertainties of the methodcommonly used for these systems and the large uncertainties of the individualglobular cluster velocities.

A spectroscopic study of MATLAS-2019 with MUSE: an ultra-diffuse galaxy with an excess of old globular clusters