I will present preliminary results from our Hubble Space Telescope follow-up imaging of the faintest candidate dwarf, Virgo I. Virgo I has a Galactocentric radius of approximately 90 kpc and an estimated absolute visual magnitude of -0.8 which makes it the least luminous galaxy discovered to date. This dwarf galaxy could be identified as a prototype "hyper" faint galaxy and give way to a new class of objects. The data from the HST allows us to derive a color-magnitude diagram that is ~3 mag deeper than the Hyper Suprime-Cam discovery data, and thus to assess Virgo I's real nature. The characterization of the smallest inhabited dark matter subhalos is crucial to further our understanding of hierarchal galaxy formation.
American Astronomical Society Meeting Abstracts #235
- Pub Date:
- January 2020