Observational Evidence for Large-Scale Gas Heating in a Galaxy Protocluster at z=2.30

Chenze Dong, Khee-Gan Lee, Metin Ata +2

We report a $z=2.30$ galaxy protocluster (COSTCO-I) in the COSMOS field, where the Lyman-$\alpha$ forest as seen in the CLAMATO IGM tomography survey does not show significant absorptio…