The paper presents evidence that a 72 pc wide, 2 kpc long tidal feature in HST and CFHT images of UGC9050-Dw1 is an extragalactic globular cluster stream, and uses it to infer a massive dark matter halo.
A shallow dark matter halo in Ultra Diffuse Galaxy AGC 242019: are UDGs structurally similar to low surface brightness galaxies?
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abstract
A central question regarding Ultra Diffuse Galaxies (UDGs) is whether they are a separate category to Low Surface Brightness (LSB) galaxies, or just their natural continuation towards low stellar masses. In this letter, we show that the rotation curve of the gas rich UDG AGC 242019 is well fit by a dark matter halo with inner slope that asymptotes to -0.54, and that such fit provides a concentration parameter that matches theoretical expectations. This finding, together with previously works in which shallow inner profiles are derived for UDGs, shows that the structural properties of these galaxies are like other observed LSBs. UDGs show slowly rising rotation curves and this favours formation scenarios in which internal processes, such as SNae driven gas outflows, are acting to modify UDGs profiles.
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Evidence for the First Globular Cluster Stellar Stream beyond the Milky Way
The paper presents evidence that a 72 pc wide, 2 kpc long tidal feature in HST and CFHT images of UGC9050-Dw1 is an extragalactic globular cluster stream, and uses it to infer a massive dark matter halo.