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

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 star-burst galaxies in the distant universe at millimeter and submillimeter wavelength. 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.

arXiv commentAccepted for publication in the Journal of Low Temperature Physics for LTD-18 special issue

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Cited by in corpus (7)

• Applications for Microwave Kinetic Induction Detectors in Advanced Instrumentation
• DESHIMA 2.0: development of an integrated superconducting spectrometer for science-grade astronomical observations
• Large format imaging spectrograph for the Large Submillimeter Telescope (LST)
• DESHIMA 2.0: Rapid redshift surveys and multi-line spectroscopy of dusty galaxies
• TiEMPO: Open-source time-dependent end-to-end model for simulating ground-based submillimeter astronomical observations
• High-uniformity TiN/Ti/TiN multilayers for the development of Microwave Kinetic Inductance Detector
• Design of SPT-SLIM focal plane; a spectroscopic imaging array for the South Pole Telescope