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Structural Parameters and Possible Association of the Ultra-faint Dwarfs Pegasus III and Pisces II from Deep Hubble Space Telescope Photometry
2022
Astrophysical Journal
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf (UFD) galaxies Pegasus III (Peg III) and Pisces II (Psc II), two of the most distant satellites in the halo of the Milky Way (MW). We measure the structure of both galaxies, derive mass-to-light ratios with newly determined absolute magnitudes, and compare our findings to expectations from UFD-mass simulations. For Peg III, we find an elliptical half-light radius of a h = 1 .′ 88 − 0.33 + 0.42 ( 118 − 30 + 31 pc)
doi:10.3847/1538-4357/ac7226
fatcat:y2ldaovz5rbepp6yaoxiscqlcu