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A Faint New Milky Way Satellite in Bootes

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arxiv astro-ph/0604355 v2 pith:QQKL5Y5G submitted 2006-04-17 astro-ph

classification astro-ph
keywords bootesbranchmilkysatelliteabsoluteannouncecolor-magnitudeconstellation
verification ladder T0 review T1 audit T2 compute T3 formal
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In this Letter, we announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of 60 kpc. It was found in a systematic search for stellar overdensities in the North Galactic Cap using Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The color-magnitude diagram shows a well-defined turn-off, red giant branch, and extended horizontal branch. Its absolute magnitude is -5.8, which makes it one of the faintest galaxies known. The half-light radius is 220 pc. The isodensity contours are elongated and have an irregular shape, suggesting that Boo may be a disrupted dwarf spheroidal galaxy.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Dark Matter in Draco and Bo\"otes I: Hints of a Core in an Ultra-Faint Dwarf from Simulation-Based Inference

    astro-ph.GA 2026-06 unverdicted novelty 7.0 of 10

    GraphNPE recovers a significantly lower central density for Boötes I consistent with a core while Draco remains marginally cuspy, and demonstrates that higher-order velocity moments reduce bias in dynamical modeling.

  2. HI Observations of Baryon-Dominated Dwarf Galaxy Candidates

    astro-ph.GA 2026-05 unverdicted novelty 6.0 of 10

    Resolved HI observations of six baryon-dominated dwarf galaxy candidates show four are dark-matter deficient with high baryon efficiency, two in isolated environments without tidal signs.

  3. The Pristine Dwarf Galaxy Survey -- VII. The metallicity distributions of 12 Milky Way faint satellites

    astro-ph.GA 2026-06 unverdicted novelty 5.0 of 10

    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.

  4. The satellite galaxies of the Milky Way and Andromeda

    astro-ph.GA 2025-02 unverdicted novelty 2.0 of 10

    A field review of Local Group dwarf satellites, their discovery, observed properties, and use as dark matter and galaxy evolution probes.

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