DESHIMA 2.0: development of an integrated superconducting spectrometer for science-grade astronomical observations

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Akio Taniguchi Tom J. L. C. Bakx Jochem J. A. Baselmans Robert Huiting Kenichi Karatsu Nuria Llombart Matus Rybak Tatsuya Takekoshi Yoichi Tamura Hiroki Akamatsu Stefanie Brackenhoff Juan Bueno Bruno T. Buijtendorp Shahab Dabironezare Anne-Kee Doing Yasunori Fujii Kazuyuki Fujita Matthijs Gouwerok Sebastian Hähnle Tsuyoshi Ishida

摘要： Integrated superconducting spectrometer (ISS) technology will enable ultra-wideband, integral-field spectroscopy for (sub)millimeter-wave astronomy, in particular, for uncovering the dust-obscured cosmic star formation and galaxy evolution over cosmic time. Here we present the development of DESHIMA 2.0, an ISS for ultra-wideband spectroscopy toward high-redshift galaxies. DESHIMA 2.0 is designed to observe the 220-440 GHz band in a single shot, corresponding to a redshift range of $z$=3.3-7.6 for the ionized carbon emission ([C II] 158 $\mu$m). The first-light experiment of DESHIMA 1.0, using the 332-377 GHz band, has shown an excellent agreement among the on-sky measurements, the lab measurements, and the design. As a successor to DESHIMA 1.0, we plan the commissioning and the scientific observation campaign of DESHIMA 2.0 on the ASTE 10-m telescope in 2023. Ongoing upgrades for the full octave-bandwidth system include the wideband 347-channel chip design and the wideband quasi-optical system. For efficient measurements, we also develop the observation strategy using the mechanical fast sky-position chopper and the sky-noise removal technique based on a novel data-scientific approach. In the paper, we show the recent status of the upgrades and the plans for the scientific observation campaign.

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