Terahertz atmospheric windows for high angular resolution terahertz astronomy from Dome A
at : Dec 18, 2018 09:47:09  (view:138)

Authors: Hiroshi Matsuo1, Sheng-Cai Shi2, Scott Paine3, Qi-Jun Yao2, Zhen-Hui Lin2

1National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan;

2Purple Mountain Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210034, China;

3Smithsonian Astrophysical Observatory, Cambridge 02138, Massachusetts, USA.

Corresponding author: h.matsuo@nao.ac.jp

Abstract: Atmospheric transmission from Dome A, Antarctica, presents new possibilities in the field of terahertz astronomy, where space telescopes have been the only observational tools until now. Using atmospheric transmission measurements from Dome A with a Fourier transform spectrometer, transmission spectra and long-term stabilities have been analyzed at 1.461 THz, 3.393 THz, 5.786 THz and 7.1 THz, which show that important atmospheric windows for terahertz astronomy open for a reasonable length of time in winter season. With large aperture terahertz telescopes and interferometers in Dome A, high angular resolution terahertz observations are foreseen for atomic fine-structure lines from ionized gas and a water ice feature from protoplanetary disks.

Keywords: Terahertz astronomy, Atmospheric window, Fourier transform spectroscopy, Terahertz telescope, Terahertz interferometry