Delft University of Technology
DESHIMA: Integrated Superconducting Spectrometer for Wideband Submillimeter Astronomy
Endo, A.
Publication date 2020
Document Version Final published version Citation (APA)
Endo, A. (2020). DESHIMA: Integrated Superconducting Spectrometer for Wideband Submillimeter Astronomy. Abstract from Research Center for the Early Universe Colloquium, .
Important note
To cite this publication, please use the final published version (if applicable). Please check the document version above.
Copyright
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons. Takedown policy
Please contact us and provide details if you believe this document breaches copyrights. We will remove access to the work immediately and investigate your claim.
This work is downloaded from Delft University of Technology.
東京大学大学院理学系研究科 附属ビッグバン宇宙国際研究センター
日 時： 2020 年 12 月 1 0 日（木） 17 : 00 〜18 : 00
場 所： オンライン (Zoom)
講
師：
Akira Endo
氏
(Delft University of Technology, on behalf of the DESHIMA collaboration)DESHIMA: Integrated Superconducting Spectrometer for
Wideband Submillimeter Astronomy
Abstract
The integrated superconducting spectrometer (ISS) enables ultra-wideband, large field-of-view integral-field-spectrometer designs for mm-submm wave astronomy. DESHIMA (Deep Spectroscopic High-redshift Mapper) is a single-pixel ISS spectrometer for the ASTE 10-m telescope, designed to observe the 220-440 GHz band in a single shot, corresponding to a [CII]-line redshift range of z=3.3-7.6.
In this colloquium I will present the instrument concept, design, and first on-sky results of DESHIMA, obtained from October to December 2017 on the ASTE telescope. On the ISS chip of DESHIMA, the signal is captured by a lens-antenna and subsequently travels through a coplanar waveguide made of superconducting NbTiN, from which NbTiN bandpass filters branch out to divide the signal into separate frequency channels. At the output of each filter is a NbTiN/Al hybrid
microwave kinetic inductance detector (MKID). The first generation of DESHIMA (DESHIMA 1.0) is a 1-pixel spectrometer that covers the 332-377 GHz band with 49 spectral channels, offering a spectral resolution F/dF ~ 380. We present detection of molecular emission lines from various sources, including a weakly redshifted CO line from the luminous infrared galaxy VV 114. The on-sky performance shows excellent agreement between the design and laboratory measurement in terms of the sensitivity, optical efficiency and beam pattern. In addition, we present wideband spectral maps of extended sources to demonstrate the potential of the ISS technology towards spectroscopic direct imaging.
Ongoing upgrades towards the octave-bandwidth full system (DESHIMA 2.0) include the development of a filterbank chip with ~350 channels and higher optical efficiency, a wideband quasioptical design, and observing methods for efficiently removing the atmosphere.
DESHIMA is a collaboration between the Netherlands (TU Delft, SRON, Leiden University, +) and Japan (University of Tokyo, Nagoya University, Kitami Institute of Technology, NAOJ, +).
興味をお持ちの方の聴講を歓迎致します。
