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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 4.

(a) Enlargement of the color image shown in Figure 1. (b) Summed g and i image, after subtracting a 2D model for the galaxy. Black, large circles indicate compact objects brighter than the completeness limit. Gray circles are fainter objects. The broken ellipse indicates the assumed half-number semimajor axis of the globular clusters: ﹩{R}_{\mathrm{gc}}=1.5{R}_{e}=6.5\,\mathrm{kpc}﹩. (c) Magnitude distribution of compact sources with ﹩R\lt {R}_{\mathrm{gc}}﹩. The red curve indicates the expected contribution from background objects. (d) Magnitude distribution brighter than the completeness limit, after subtracting the expected background and multiplying by two to include objects with ﹩R\gt {R}_{\mathrm{gc}}﹩. The blue curves are fits to the distribution for different assumptions for the turnover magnitude. For the expected turnover ﹩{m}_{\mathrm{cen}}=27.5﹩, the total number of globular clusters is ﹩{N}_{\mathrm{gc}}={94}_{-20}^{+25}﹩.

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