DESHIMA 2.0
Development of an Integrated Superconducting Spectrometer for Science-Grade Astronomical Observations
Jochem J.A. Baselmans (SRON–Netherlands Institute for Space Research, TU Delft - Electrical Engineering, Mathematics and Computer Science)
Kenichi Karatsu (TU Delft - Electrical Engineering, Mathematics and Computer Science, SRON–Netherlands Institute for Space Research)
Nuria Llombart (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Matus Rybak (Universiteit Leiden, TU Delft - Electrical Engineering, Mathematics and Computer Science)
Juan Bueno (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Bruno T. Buijtendorp (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Shahab O. Dabironezare (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Sebastian Hähnle (SRON–Netherlands Institute for Space Research, TU Delft - Electrical Engineering, Mathematics and Computer Science)
Alejandro Pascual Laguna (TU Delft - Electrical Engineering, Mathematics and Computer Science, SRON–Netherlands Institute for Space Research)
David J. Thoen (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Stephen J.C. Yates (SRON–Netherlands Institute for Space Research, TU Delft - Electrical Engineering, Mathematics and Computer Science)
Akira Endo (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
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 μ 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 laboratory 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.