Marla Geha

Rubin Observatory Reveals a Dust-shrouded Halo Globular Cluster in Ophiuchus

Abstract We present the discovery of the Milky Way satellite Rubin-GC1 (Rubin J1628−1735) using data from the NSF-DOE Vera C. Rubin Observatory’s Early Data Preview 2. The system was discovered in the direction of the Galactic bulge with ( l , b ) ∼ (359°, 21°) in a region of hig...

The Metallicity Distribution of the Ultra-Faint Dwarf Galaxy Segue 1

Ultra-faint dwarf galaxies (UFDs; stellar masses M * < 10 5 M ⊙ ) offer unique insights into early chemical evolution in low-mass systems. However, interpreting their metallicity distribution functions (MDFs) has been challenging due to limited spectroscopic samples, especially b...