A Massive Quiescent Galaxy Confirmed in a Protocluster at z = 3.09

@article{Kubo2021AMQ,
  title={A Massive Quiescent Galaxy Confirmed in a Protocluster at z = 3.09},
  author={Mariko Kubo and Hideki Umehata and Yuichi Matsuda and Masaru Kajisawa and Charles C. Steidel and Toru Yamada and Ichi Tanaka and Bunyo Hatsukade and Yoichi Tamura and Kouichiro Nakanishi and Kotaro Kohno and Kianhong Lee and Keiichi Matsuda},
  journal={The Astrophysical Journal},
  year={2021},
  volume={919}
}
We report a massive quiescent galaxy at zspec=3.0922−0.004+0.008 spectroscopically confirmed at a protocluster in the SSA22 field by detecting the Balmer and Ca ii absorption features with the multi-object spectrometer for infrared exploration on the Keck I telescope. This is the most distant quiescent galaxy confirmed in a protocluster to date. We fit the optical to mid-infrared photometry and spectrum simultaneously with spectral energy distribution (SED) models of parametric and… 
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