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Lucas, Simona Mei, Steven L. Finkelstein","submitted_at":"2014-03-28T20:00:04Z","abstract_excerpt":"We present the discovery of two galaxy overdensities in the Hubble Space Telescope UDF: a proto-cluster, HUDFJ0332.4-2746.6 at $z = 1.84 \\pm 0.01$, and a group, HUDFJ0332.5-2747.3 at $z =1.90 \\pm 0.01$. Assuming viralization, the velocity dispersion of HUDFJ0332.4-2746.6 implies a mass of $M_{200}= (2.2 \\pm 1.8) \\times 10^{14} M_{\\odot}$, consistent with the lack of extended X-ray emission. Neither overdensity shows evidence of a red sequence. About $50\\%$ of their members show interactions and/or disturbed morphologies, which are signatures of merger remnants or disk instability. 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