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Portrait of a Dark Horse: a Photometric and Spectroscopic Study of the Ultra-faint Milky Way Satellite Pegasus III

Kim, Dongwon; Jerjen, Helmut; Geha, Marla; Chiti, Anirudh; Milone, Antonino; Da Costa, Gary; Mackey, Dougal; Frebel, Anna; Conn, Blair


Pegasus III (Peg III) is one of the few known ultra-faint stellar systems in the outer halo of the Milky Way. We present the results from a follow-up campaign with Magellan/IMACS and Keck/DEIMOS. Deep stellar photometry down to {r}0≈ 25 mag at 50% completeness level has allowed accurate measurements of its photometric and structural properties. The color-magnitude diagram of Peg III confirms that the stellar system is well described by an old (≳12 Gyr) and metal-poor ([Fe/H] ≲ -2.0 dex) stellar...[Show more]

CollectionsANU Research Publications
Date published: 2016
Type: Journal article
Source: The Astrophysical Journal
DOI: 10.3847/0004-637X/833/1/16
Access Rights: Open Access


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