Yuan, TianTian; Nanayakkara, Themiya; Kacprzak, Glenn; Tran, Kim-Vy; Glazebrook, Karl; Kewley, Lisa; Spitler, Lee R.; Poole, Gregory B; Labbe, Ivo; Straatman, Caroline; Tomczak, Adam
We present spectroscopic confirmation of a galaxy cluster at z = 2.095 in the COSMOS field. This galaxy cluster was first reported in the ZFOURGE survey as harboring evolved massive galaxies using photometric redshifts derived with deep near-infrared (NIR) medium-band filters. We obtain medium-resolution (R ∼ 3600) NIR spectroscopy with MOSFIRE on the Keck 1 telescope and secure 180 redshifts in a 12′ x 12′ region. We find a prominent spike of 57 galaxies at z = 2.095 corresponding to the...[Show more]
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