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The Formation History of the Ultra-Faint Dwarf Galaxies

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arxiv 1310.0824 v1 pith:H6DTZBVW submitted 2013-10-02 astro-ph.CO astro-ph.GA

Thomas M. Brown , Jason Tumlinson , Marla Geha , Evan Kirby , Don A. VandenBerg , Jason S. Kalirai , Joshua D. Simon , Roberto J. Avila
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Ricardo R. Munoz Puragra Guhathakurta Alvio Renzini Henry C. Ferguson Luis C. Vargas Mario Gennaro
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keywords galaxiessurveydwarfultra-faintdominatedearlyhistoriesleast
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We present early results from a Hubble Space Telescope survey of the ultra-faint dwarf galaxies. These Milky Way satellites were discovered in the Sloan Digital Sky Survey, and appear to be an extension of the classical dwarf spheroidals to low luminosities, offering a new front in the efforts to understand the missing satellite problem. Because they are the least luminous, most dark matter dominated, and least chemically evolved galaxies known, the ultra-faint dwarfs are the best candidate fossils from the early universe. The primary goal of the survey is to measure the star-formation histories of these galaxies and discern any synchronization due to the reionization of the universe. We find that the six galaxies of our survey have very similar star-formation histories, and that each is dominated by stars older than 12 Gyr.

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Cited by 2 Pith papers

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

  1. Tidal pre-conditioning and ram-pressure stripping in NGC 1427A. Deep VLT/MUSE spectroscopy and FUV-to-radio observations trace a Fornax Cluster dwarf in transformation

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

    Multi-phase observations of NGC 1427A indicate tidal torquing from a dwarf fly-by has pre-conditioned its gas for ram-pressure stripping by the Fornax intracluster medium, placing the galaxy at the onset of environmen...

  2. Tidal pre-conditioning and ram-pressure stripping in NGC 1427A. Deep VLT/MUSE spectroscopy and FUV-to-radio observations trace a Fornax Cluster dwarf in transformation

    astro-ph.GA 2026-05 unverdicted novelty 4.0 of 10

    NGC 1427A exhibits ram-pressure stripping that has reached its ISM after tidal torquing by a nearby dwarf, marking the onset of cluster-driven gas loss and declining star formation.

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