Direct Detection Submillimeter Spectrometer for CCAT

摘要

We present a trade study for a submillimeter direct-detection spectrometer operating at the background limit for theCornell Caltech Atacama Telescope (CCAT). In this study we compare the classical echelle spectrometer ZEUS with thewaveguide grating spectrometer Z-Spec. The science driver for this instrument is spectroscopic investigation of highredshift galaxies as their far-IR fine structure line emission is redshifted into the telluric submillimeter windows. Thebaseline detector consists of SQUID multiplexed TES bolometers and the ideal spectrometer to detect weak lines fromdistant extragalactic sources is a grating with a resolution of –103 and a large bandwidth, covering an entire telluricsubmillimeter window instantaneously. Since the density of high-z sources on the sky is ~100 within a 10'x10' field ofview and a redshift range of Δz~0.2 we also explore multi-object (~50 objects) capability, including articulated mirrorsand flexible waveguide fibers.