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DESHIMA on ASTE: On-Sky Responsivity Calibration of the Integrated Superconducting Spectrometer

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Abstract

We are developing an ultra-wideband spectroscopic instrument, DESHIMA (DEep Spectroscopic HIgh-redshift MApper), based on the technologies of an on-chip filter bank and microwave kinetic inductance detector (MKID) to investigate dusty starburst galaxies in the distant universe at millimeter and submillimeter wavelengths. An on-site experiment of DESHIMA was performed using the ASTE 10-m telescope. We established a responsivity model that converts frequency responses of the MKIDs to line-of-sight brightness temperature. We estimated two parameters of the responsivity model using a set of skydip data taken under various precipitable water vapor (PWV 0.4–3.0 mm) conditions for each MKID. The line-of-sight brightness temperature of sky is estimated using an atmospheric transmission model and the PWVs. As a result, we obtain an average temperature calibration uncertainty of \(1\sigma =4\)%, which is smaller than other photometric biases. In addition, the average forward efficiency of 0.88 in our responsivity model is consistent with the value expected from the geometrical support structure of the telescope. We also estimate line-of-sight PWVs of each skydip observation using the frequency response of MKIDs and confirm the consistency with PWVs reported by the Atacama Large Millimeter/submillimeter Array.

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Acknowledgements

This research was supported by the Netherlands Organization for Scientific Research NWO (Vidi Grant No. 639.042.423, NWO Medium Investment Grant No. 614.061.611 DESHIMA), the European Research Council ERC (ERC-CoG-2014—Proposal n\(^\circ\) 648135 MOSAIC), the Japan Society for the Promotion of Science JSPS (KAKENHI Grant Numbers JP25247019, JP17H06130 and JP19K14754) and the Grant for Joint Research Program of the Institute of Low Temperature Science, Hokkaido University. Y.T. and T.J.L.C.B. are supported by NAOJ ALMA Scientific Research Grant Number 2018-09B. P.J.d.V. is supported by the NWO (Veni Grant 639.041.750). T.M.K. is supported by the ERC Advanced Grant No. 339306 (METIQUM) and the Russian Science Foundation (Grant No. 17-72-30036). N.L. is supported by ERC (Starting Grant No. 639749). J.S. and M.N. are supported by the JSPS Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers (Program No. R2804). T.J.L.C.B was supported by the European Union Seventh Framework Programme (FP7/2007–2013, FP7/2007–2011) under Grant Agreement No. 607254. Data analysis was, in part, carried out on the open-use data analysis computer system at the Astronomy Data Center of NAOJ. The ASTE telescope is operated by the National Astronomical Observatory of Japan (NAOJ).

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Takekoshi, T., Karatsu, K., Suzuki, J. et al. DESHIMA on ASTE: On-Sky Responsivity Calibration of the Integrated Superconducting Spectrometer. J Low Temp Phys 199, 231–239 (2020). https://doi.org/10.1007/s10909-020-02338-0

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