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A Hero's Dark Horse: Discovery of an Ultra-faint Milky Way Satellite in Pegasus

Kim, Dongwon; Jerjen, Helmut; Mackey, Douglas; Da Costa, Gary; Milone, Antonino

Description

We report the discovery of an ultra-faint Milky Way satellite galaxy in the constellation of Pegasus. The concentration of stars was detected by applying our overdensity detection algorithm to the SDSS-DR 10 and confirmed with deeper photometry from the Dark Energy Camera at the 4 m Blanco telescope. Fitting model isochrones indicates that this object, Pegasus III, features an old and metal-poor stellar population ([Fe/H] ∼ -2.1) at a heliocentric distance of 205 ± 20 kpc. The new stellar...[Show more]

CollectionsANU Research Publications
Date published: 2015
Type: Journal article
URI: http://hdl.handle.net/1885/102600
Source: Astrophysical Journal Letters
DOI: 10.1088/2041-8205/804/2/L44

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