COSMOS2020: Discovery of a protocluster of massive quiescent galaxies at $z=2.77$

Abstract

Protoclusters of galaxies have been found in the last quarter century. However, most of them have been found through the overdensity of star-forming galaxies, and there had been no known structures identified by multiple spectroscopically confirmed quiescent galaxies at $z>2.5$. In this letter, we report the discovery of an overdense structure of massive quiescent galaxies with the spectroscopic redshift $z=2.77$ in the COSMOS field, QO-1000. We first photometrically identify this structure as a $4.2\sigma$ overdensity with 14 quiescent galaxies in $7\times 4\mathrm{pMp}{\mathrm{c}}^2$ from the COSMOS2020 catalog. We then securely confirm the spectroscopic redshifts of 4 quiescent galaxies by detecting multiple Balmer absorption lines with Keck/MOSFIRE. All the spectroscopically confirmed members are massive ($\log (M_{\star }/M_{\odot })>11.0$) and located in a narrow redshift range ($2.76<z<2.79$). Moreover, three of them are in the $1\times 1\mathrm{pMp}{\mathrm{c}}^2$ in the transverse direction at the same redshift ($z=2.760-2.763$). Such a concentration of four spectroscopically confirmed quiescent galaxies implies that QO-1000 is $>68$ times denser than in the general field. In addition, we confirm that they form a red sequence in the $J-K_s$ color. This structure's halo mass is estimated as $\log (M_{\mathrm{halo}}/M_{\odot })>13.2$ from their stellar mass. Similar structures found in the IllustrisTNG simulation are expected to evolve into massive galaxy clusters with $\log (M_{\mathrm{halo}}/M_{\odot })\ge 14.8$ at $z=0$. These results suggest that QO-1000 is a more mature protocluster than the other known protoclusters. It is likely in a transition phase between the star-forming protoclusters and the quenched galaxy clusters.

arXiv comment11 pages, 4 figures, 1 table, accepted for publication in ApJL

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