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A wide field-of-view low-resolution spectrometer at APEX: Instrument design and scientific forecast

Ade, P., Aravena, M., Barria, E., Beelen, A., Benoit, A., Béthermin, M., Bounmy, J., Bourrion, O., Bres, G., De Breuck, C., Calvo, M., Cao, Y., Catalano, A., Désert, F.-X., Durán, C.A., Fasano, A., Fenouillet, T., Garcia, J., Garde, G., Goupy, J., Groppi, C., Hoarau, C., Lagache, G., Lambert, J.-C., Leggeri, J.-P., Levy-Bertrand, F., Macías-Pérez, J., Mani, H., Marpaud, J., Mauskopf, P., Monfardini, A., Pisano, G., Ponthieu, N., Prieur, L., Roni, S., Roudier, S., Tourres, D. and Tucker, C. 2020. A wide field-of-view low-resolution spectrometer at APEX: Instrument design and scientific forecast. Astronomy and Astrophysics 642 , A60. 10.1051/0004-6361/202038456

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Abstract

Context. Characterising the large-scale structure in the Universe from present times to the high redshift epoch of reionisation is essential to constraining the cosmology, the history of star formation, and reionisation, to measuring the gas content of the Universe, and to obtaining a better understanding of the physical processes that drive galaxy formation and evolution. Using the integrated emission from unresolved galaxies or gas clouds, line intensity mapping (LIM) provides a new observational window to measure the larger properties of structures. This very promising technique motivates the community to plan for LIM experiments. Aims. We describe the development of a large field-of-view instrument, named CONCERTO (for CarbON CII line in post-rEionisation and ReionisaTiOn epoch), operating in the range 130–310 GHz from the APEX 12-m telescope (5100 m above sea level). CONCERTO is a low-resolution spectrometer based on the lumped element kinetic inductance detectors (LEKID) technology. Spectra are obtained using a fast Fourier transform spectrometer (FTS), coupled to a dilution cryostat with a base temperature of 0.1 K. Two two kilo-pixel arrays of LEKID are mounted inside the cryostat that also contains the cold optics and the front-end electronics. Methods. We present, in detail, the technological choices leading to the instrumental concept, together with the design and fabrication of the instrument and preliminary laboratory tests on the detectors. We also give our best estimates for CONCERTO sensitivity and give predictions for two of the main scientific goals of CONCERTO, that is, a [CII]-intensity mapping survey and observations of galaxy clusters. Results. We provide a detailed description of the instrument design. Based on realistic comparisons with existing instruments developed by our group (NIKA, NIKA2, and KISS), and on the laboratory characterisation of our detectors, we provide an estimate for CONCERTO sensitivity on the sky. Finally, we describe, in detail, two of the main scientific goals offered by CONCERTO at APEX. Key words: instrumentation: detectors / instrumentation: spectrographs / telescopes / cosmology: observations © The CONCERTO collaboration 2020

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Additional Information: Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 6 November 2020
Date of Acceptance: 24 July 2020
Last Modified: 09 Nov 2020 09:30
URI: http://orca.cardiff.ac.uk/id/eprint/136165

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