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 \(\upmu\)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.
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A model that includes only photon noise and quasi-particle recombination noise as noise sources.
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Acknowledgments
This research was supported by the Japan Society for the Promotion of Science JSPS (KAKENHI Grant Nos. 17H06130, 18K03704) and the Joint Research Program of the Institute of Low Temperature Science, Hokkaido University (Grant Nos. 21G024, 20G033). AE was supported by the Netherlands Organization for Scientific Research NWO (Vidi Grant No. 639.042.423). JJAB was supported by the European Research Council ERC (ERC-CoG-2014 - Proposal n\(^\circ\) 648135 MOSAIC). TT was supported by MEXT Leading Initiative for Excellent Young Researchers (Grant No. JPMXS0320200188). YT is supported by JSPS (KAKENHI Grant Nos. 20H01951, 22H04939). YT and TJLCB are supported by NAOJ ALMA Scientific Research (Grant No. 2018-09B). The ASTE telescope is operated by the National Astronomical Observatory of Japan (NAOJ).
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Taniguchi, A., Bakx, T.J.L.C., Baselmans, J.J.A. et al. DESHIMA 2.0: Development of an Integrated Superconducting Spectrometer for Science-Grade Astronomical Observations. J Low Temp Phys 209, 278–286 (2022). https://doi.org/10.1007/s10909-022-02888-5
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DOI: https://doi.org/10.1007/s10909-022-02888-5