The Epoch-of-Reionization Spectrometer, EoR-Spec: A Spectrometer Instrument Module for Prime-Cam on FYST

The EoR-Spec (Epoch of Reionization Spectrometer) is an instrument module for Prime-Cam, which is the main direct detection instrument on the 6 meter aperture FYST (Fred Young Submillimeter Telescope) located near the summit of Cerro Chajnantor in the Atacama desert in northern Chile above the ALMA plateau. Two of the seven instrument modules of Prime-Cam are planned to be EoR-Spec modules.

With a spectral resolving power of $R\sim100$, a frequency coverage of 210 to 420 GHz, and a field of view of about 1.3$^{\circ}$ each of the EoR-Spec modules is optimized for Line Intensity Mapping of the red-shifted CII 158 $\mu$m fine structure line from the epoch of reionization by generating many redshift slices over the range z=3.5 to 8.

The CII emission traces the signal of star formation from aggregation of galaxies and thus tracks the morphology of the ionization of the interstellar and intergalactic medium in this epoch. The E-COSMOS and E-CDFS fields have been selected as the target survey fields for studying the epoch of reionization.