We present a conceptual study of a large format imaging spectrograph for the Large Submillimeter Telescope (LST) and the Atacama Large Aperture Submillimeter Telescope (AtLAST). Recent observations of high-redshift galaxies indicate the onset of earliest star formation just a few 100 million years after the Big Bang (i.e., z = 12--15), and LST/AtLAST will provide a unique pathway to uncover spectroscopically-identified first forming galaxies in the pre-reionization era, once it will be equipped with a large format imaging spectrograph. We propose a 3-band (200, 255, and 350 GHz), medium resolution (R = 2,000) imaging spectrograph with 1.5 M detectors in total based on the KATANA concept (Karatsu et al. 2019), which exploits technologies of the integrated superconducting spectrometer (ISS) and a large-format imaging array. A 1-deg2 drilling survey (3,500 hr) will capture a large number of [O III] 88 um (and [C II] 158 um) emitters at z = 8--9, and constrain [O III] luminosity functions at z > 12.
@article{arxiv.2102.08280,
title = {Large format imaging spectrograph for the Large Submillimeter Telescope (LST)},
author = {K. Kohno and R. Kawabe and Y. Tamura and A. Endo and J. J. A. Baselmans and K. Karatsu and A. K. Inoue and K. Moriwaki and N. H. Hayatsu and N. Yoshida and Y. Yoshimura and B. Hatsukade and H. Umehata and T. Oshima and T. Takekoshi and A. Taniguchi and P. D. Klaassen and T. Mroczkowski and C. Cicone and F. Bertoldi and H. Dannerbauer and T. Tosaki},
journal= {arXiv preprint arXiv:2102.08280},
year = {2021}
}
Comments
Presented at SPIE Astronomical Telescopes + Instrumentation 2020. Full published paper and video available at http://dx.doi.org/10.1117/12.2561238 See also https://www.lstobservatory.org for the LST project