Discovery and spectroscopic confirmation of DELVE 8/Gemini I as an ultra-faint compact Milky Way satellite at 120 kpc with low metallicity upper limit.
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The MAGIC survey provides photometric metallicities for RGB stars over ~3000 deg² using CaHK narrow-band imaging plus DELVE g,r,i data, recovering 13/14 known ultra-faint dwarfs and confirming a distant Reticulum II member.
Segue 1 has a metallicity distribution with mean [Fe/H] = -2.52 dex and dispersion 0.59 dex showing no subpopulations, consistent with continuous star formation lasting less than 1 Gyr before reionization.
citing papers explorer
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Discovery and Spectroscopic Characterization of a Distant, Compact Milky Way Satellite in Gemini
Discovery and spectroscopic confirmation of DELVE 8/Gemini I as an ultra-faint compact Milky Way satellite at 120 kpc with low metallicity upper limit.
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The Metallicity Distribution of the Ultra-Faint Dwarf Galaxy Segue 1
Segue 1 has a metallicity distribution with mean [Fe/H] = -2.52 dex and dispersion 0.59 dex showing no subpopulations, consistent with continuous star formation lasting less than 1 Gyr before reionization.