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

  • Authors: Pieter van Dokkum, Roberto Abraham, Jean Brodie, Charlie Conroy, Shany Danieli, Allison Merritt, Lamiya Mowla, Aaron Romanowsky, and Jielai Zhang

2016 The Astrophysical Journal Letters 828 L6.

  • Provider: AAS Journals

Caption: Figure 2.

Deep (33.5 hr) spectrum of Dragonfly 44 obtained with DEIMOS on the Keck II telescope. The top panel shows the 2D spectrum. The main panel is the collapsed 1D spectrum, with the ﹩1\sigma ﹩ uncertainties indicated in gray. A flexible model was fitted to the spectrum to determine the stellar velocity dispersion. The best-fitting model, with a dispersion ﹩\sigma ={47}_{-6}^{+8}﹩ ﹩\mathrm{km}\,{{\rm{s}}}^{-1}﹩, is shown in red.

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