An Ancient Massive Quiescent Galaxy Found in a Gas-rich z ∼ 3 Group

Deep ALMA and HST observations reveal the presence of a quenched massive galaxy within the $z=2.91$ galaxy group RO-1001. With a mass-weighted stellar age of $1.6 \pm 0.4 \,$Gyr this galaxy is one of the oldest known at $z\sim3$, implying that most of its $10^{11}\rm \, M_{\odot}$ of stars were rapidly formed at $z>6$--8. This is a unique example of the predominantly passive evolution of a galaxy over at least $3

Keywords:

• Astrophysics
• Halo
• Physics
• accretion
• group
• Galaxy group
• Galaxy
• Stars

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