Sky noise removal for submillimeter spectroscopy based on statistical methods

Abstract

Removing sky emission is essential to extract astronomical signals for submillimeter spectroscopy with ground-based single-dish telescopes, however, conventional switching methods not only cause baseline instability but result in low observing efficiency of on-source. Here we present two statistical approaches to efficient sky removal. For a heterodyne receiver, we develop an off-point-less observing method by a frequency-modulating local oscillator (FMLO; Taniguchi et al., PASJ, in press), which is three times more efficient than the conventional method. For an ultra-wideband spectrometer (DESHIMA; Endo et al. 2019a, 2019b), we develop a sky removal method applicable to continuum observations by using an atmospheric model.

Authors 15

1. Akio Taniguchi

   Nagoya University

   Affiliation as printed

   Nagoya University, Japan

2. Yoichi Tamura

   Nagoya University

   Affiliation as printed

   Nagoya University, Japan

3. Kotaro Kohno

   The University of Tokyo

   Affiliation as printed

   The University of Tokyo , Japan

4. Shigeru Takahashi

   National Astronomical Observatory of Japan

   Affiliation as printed

   National Astronomical Observatory of Japan (Japan)

5. Osamu Horigome
   Affiliation as printed

   Zero Co. Ltd. (Japan)

6. Jun Maekawa

   National Astronomical Observatory of Japan

   Affiliation as printed

   National Astronomical Observatory of Japan (Japan)

7. Nario Kuno

   University of Tsukuba

   Affiliation as printed

   Univ. of Tsukuba (Japan)

8. Tetsuhiro Minamidani

   National Astronomical Observatory of Japan

   Affiliation as printed

   National Astronomical Observatory of Japan (Japan)

9. Tom J. L. C. Bakx

   Nagoya University

   Affiliation as printed

   Nagoya University, Japan

10. Koyo Suzuki

    Nagoya University

    Affiliation as printed

    Nagoya University, Japan

11. Tatsuya Takekoshi

    The University of Tokyo

    Affiliation as printed

    The University of Tokyo , Japan

12. Takashi Tsukagoshi

    National Astronomical Observatory of Japan

    Affiliation as printed

    National Astronomical Observatory of Japan (Japan)

13. Tai Oshima

    National Astronomical Observatory of Japan

    Affiliation as printed

    National Astronomical Observatory of Japan (Japan)

14. Akira Endo

    Delft University of Technology

    Affiliation as printed

    Technische Univ. Delft (Netherlands)

15. K. Karatsu Aachen Netherlands Institute for Space Research

    Space Research Organisation Netherlands

    Affiliation as printed

    SRON, Netherlands Institute for Space Research (Netherlands))