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The recently discovered C-19 stellar stream is a collection of kinematicallyassociated metal-poor stars in the halo of the Milky Way lacking an obviousprogenitor. The stream spans an arc of ~15 degrees in the sky, andorbit-fitting suggests an apocentric distance of ~20 kpc and a pericentre of~10 kpc. The narrow metallicity dispersion of stars with available spectra,together with light element abundance variations, suggests a globular cluster(GC) origin. The observed metallicity ([Fe/H] ~ -3.4), however, is much lowerthan that of any known GC. In addition, the width and velocity dispersion ofthe stream are similar to those expected from disrupting dwarf galaxies, andsubstantially larger than the tidal debris of GCs able to disrupt on C-19'sorbit. We propose here an unconventional model where the C-19 progenitor is adark matter-dominated stellar system with GC-like abundance patterns. We useN-body simulations to show that the tidal disruption of a ~100 pc King-modelstellar component embedded in a ~20 km/s cuspy cold dark matter halo yieldsdebris consistent with C-19's observed width and velocity dispersion. Thestellar component of the progenitor is fully disrupted, and is spread over twodistinct streams; one corresponding to C-19 and another possibly hiding behindthe Galactic plane. If such companion stream were found, it would suggest thatdark matter-dominated dwarfs may also develop GC-like enrichment patterns, afinding that would inform our theoretical understanding of the formation ofmultiple populations in GCs and dwarf galaxies alike.

The Pristine survey XVIII: C-19: Tidal debris of a dark matter-dominated globular cluster?