4.6 Article

A HIGH STELLAR VELOCITY DISPERSION AND ∼100 GLOBULAR CLUSTERS FOR THE ULTRA-DIFFUSE GALAXY DRAGONFLY 44

Journal

ASTROPHYSICAL JOURNAL LETTERS
Volume 828, Issue 1, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.3847/2041-8205/828/1/L6

Keywords

galaxies: clusters: individual (Coma); galaxies: evolution; galaxies: structure

Funding

  1. Direct For Mathematical & Physical Scien
  2. Division Of Astronomical Sciences [1312376] Funding Source: National Science Foundation

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Recently a population of large, very low surface brightness, spheroidal galaxies was identified in the Coma cluster. The apparent survival of these Ultra Diffuse Galaxies (UDGs) in a rich cluster suggests that they have very high masses. Here we present the stellar kinematics of Dragonfly 44, one of the largest Coma UDGs, using a 33.5 hr integration with DEIMOS on the Keck II telescope. We find a velocity dispersion of sigma = 47(-6)(+8) km s(-1), which implies a dynamical mass of M-dyn (

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