A Hero's Little Horse: Discovery of a Dissolving Star Cluster in Pegasus
Dongwon Kim, Helmut Jerjen

TL;DR
This paper reports the discovery of Kim 1, an ultra-faint, dissolving star cluster in Pegasus, providing insights into low luminosity clusters and their tidal disruption in the Milky Way halo.
Contribution
The paper introduces Kim 1, a newly discovered ultra-faint star cluster with unique properties, expanding knowledge of low luminosity stellar systems.
Findings
Kim 1 is an old, metal-poor star cluster at 19.8 kpc.
It has a very small size and low luminosity, similar to the faintest known clusters.
Kim 1 shows signs of tidal disruption with high ellipticity.
Abstract
We report the discovery of an ultra-faint stellar system in the constellation of Pegasus. This concentration of stars was detected by applying our overdensity detection algorithm to the SDSS-DR10 and confirmed with deeper photometry from the Dark Energy Camera at the 4-m Blanco telescope. The best-fitting model isochrone indicates that this stellar system, Kim 1, features an old (12 Gyr) and metal-poor ([Fe/H]) stellar population at a heliocentric distance of kpc. We measure a half-light radius of pc using a Plummer profile. The small physical size and the extremely low luminosity are comparable to the faintest known star clusters Segue 3, Koposov 1 & 2, and Mu\~noz 1. However, Kim 1 exhibits a lower star concentration and is lacking a well defined center. It also has an unusually high ellipticity and irregular outer isophotes, which suggests that we…
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