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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 3.

(a) Relation between dynamical ﹩M/{L}_{I}﹩ ratio and dynamical mass. Open symbols are dispersion-dominated objects from Zaritsky et al. (2006) and Wolf et al. (2010). The UDGs VCC 1287 (Beasley et al. 2016) and Dragonfly 44 fall outside of the band defined by the other galaxies, having a very high M/L ratio for their mass. (b) Relation between the number of globular clusters ﹩{N}_{\mathrm{gc}}﹩ and dynamical mass. Open symbols are from the Harris et al. (2013) compilation. The UDGs are consistent with the relation defined by other galaxies in this luminosity-independent plane.

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