Rubin-GC1 is a faint, intermediate-age globular cluster at 31 kpc, likely accreted from the Sagittarius dwarf galaxy, discovered in Rubin Early Data Preview 2.
Sagittarius II, Draco II and Laevens 3: three new Milky Way satellites discovered in the Pan-STARRS 1 3pi Survey
4 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
We present the discovery of three new Milky Way satellites from our search for compact stellar overdensities in the photometric catalog of the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS 1, or PS1) 3pi survey. The first satellite, Laevens 3, is located at a heliocentric distance of d=67+/-3 kpc. With a total magnitude of Mv=-4.4+/-0.3 and a half-light radius rh=7+/-2 pc, its properties resemble those of outer halo globular clusters. The second system, Draco II/Laevens 4 (Dra II), is a closer and fainter satellite (d~20 kpc, Mv =-2.9+/-0.8), whose uncertain size (rh = 19 +8/-6 pc) renders its classification difficult without kinematic information; it could either be a faint and extended globular cluster or a faint and compact dwarf galaxy. The third satellite, Sagittarius II/Laevens 5 (Sgr II), has an ambiguous nature as it is either the most compact dwarf galaxy or the most extended globular cluster in its luminosity range (rh = 37 +9/-8 pc and Mv=-5.2+/-0.4). At a heliocentric distance of 67+/-5 kpc, this satellite lies intriguingly close to the expected location of the trailing arm of the Sagittarius stellar stream behind the Sagittarius dwarf spheroidal galaxy (Sgr dSph). If confirmed through spectroscopic follow up, this connection would locate this part of the trailing arm of the Sagittarius stellar stream that has so far gone undetected. It would further suggest that Sgr II was brought into the Milky Way halo as a satellite of the Sgr dSph.
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astro-ph.GA 4representative citing papers
Koposov 2 is an ancient, extremely metal-poor, compact stellar system best explained as a dissolving globular cluster, not a dwarf galaxy.
Photometric analysis yields metallicity distributions for 3917 stars across 12 faint Milky Way satellites, showing average [Fe/H] ~ -2.3 dex, 170 EMP candidates, and no gradients in ultra-faint systems.
A field review of Local Group dwarf satellites, their discovery, observed properties, and use as dark matter and galaxy evolution probes.
citing papers explorer
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Rubin Observatory Reveals a Dust-Shrouded Halo Globular Cluster in Ophiuchus
Rubin-GC1 is a faint, intermediate-age globular cluster at 31 kpc, likely accreted from the Sagittarius dwarf galaxy, discovered in Rubin Early Data Preview 2.
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The Hubble Missing Globular Clusters Survey IV. Ultra-faint compact satellites of the Milky Way. The case of Koposov 2
Koposov 2 is an ancient, extremely metal-poor, compact stellar system best explained as a dissolving globular cluster, not a dwarf galaxy.
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The Pristine Dwarf Galaxy Survey -- VII. The metallicity distributions of 12 Milky Way faint satellites
Photometric analysis yields metallicity distributions for 3917 stars across 12 faint Milky Way satellites, showing average [Fe/H] ~ -2.3 dex, 170 EMP candidates, and no gradients in ultra-faint systems.
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The satellite galaxies of the Milky Way and Andromeda
A field review of Local Group dwarf satellites, their discovery, observed properties, and use as dark matter and galaxy evolution probes.