Deshima 2.0: Rapid Redshift Surveys and Multi-line Spectroscopy of Dusty Galaxies

Rybak, Matus; Bakx, Tom J. L. C.; Baselmans, J. J. A.; Karatsu, K.; Kohno, Kotaro; Takekoshi, Tatsuya; Tamura, Yoichi; Taniguchi, Akio; Werf, P. van der; Endo, Akira

doi:10.1007/s10909-022-02730-y

Cited by 3 publications

(4 citation statements)

References 52 publications

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“…The importance of the alignment procedure can be appreciated in the context of the upcoming science verification campaign of DESHIMA 2.0. One science case of the campaign, rapid redshift surveys of dusty star-forming galaxies (Rybak et al 2022), predicts a 400-h observation period to yield robust redshifts of the targets. This assumes a well-aligned system, and if misalignment is present, the required observation time will increase significantly.…”

Section: Discussionmentioning

confidence: 99%

“…Wide-band submillimeter (submm) spectroscopy could serve as a powerful tool for studying a wide range of astrophysical phenomena (Stacey 2011). For single-pixel spectroscopy, one such target is the redshifted [CII] emission line, which can be used to probe star formation over cosmic time (Lagache et al 2018), study the Universe at the epoch of reionisation (Gong et al 2011), and study high-redshift dusty star-forming galaxies (Rybak et al 2022). Multi-pixel spectrometers, also called integral field units (IFUs), can spectroscopically observe wide fields of view.…”

Section: Introductionmentioning

confidence: 99%

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Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

Moerman,

Karatsu,

Yates

et al. 2024

A&A

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Integrated superconducting spectrometers (ISSs) for wide-band submillimeter (submm) astronomy use quasi-optical systems for coupling radiation from the telescope to the instrument. Misalignment in these systems is detrimental to the system performance. The common method of using an optical laser to align the quasi-optical components requires an accurate alignment of the laser to the submm beam from the instrument, which is not always guaranteed to a sufficient accuracy. We develop an alignment strategy for wide-band ISSs that directly uses the submm beam of the wide-band ISS. The strategy should be applicable in both telescope and laboratory environments. Moreover, the strategy should deliver similar quality of the alignment across the spectral range of the wide-band ISS. We measured the misalignment in a quasi-optical system operating at submm wavelengths using a novel phase and amplitude measurement scheme that is capable of simultaneously measuring the complex beam patterns of a direct-detecting ISS across a harmonic range of frequencies. The direct detection nature of the microwave kinetic inductance detectors in our device-under-test, DESHIMA 2.0, necessitates the use of this measurement scheme. Using geometrical optics, the measured misalignment, a mechanical hexapod, and an optimisation algorithm, we followed a numerical approach to optimise the positioning of corrective optics with respect to a given cost function. Laboratory measurements of the complex beam patterns were taken across a harmonic range between 205 and 391 GHz and were simulated through a model of the ASTE telescope in order to assess the performance of the optimisation at the ASTE telescope. Laboratory measurements show that the optimised optical setup corrects for tilts and offsets of the submm beam. Moreover, we find that the simulated telescope aperture efficiency is increased across the frequency range of the ISS after the optimisation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

Moerman,

Karatsu,

Yates

et al. 2024

A&A

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“…Although the center frequencies and the Q factors of some MKIDs still require to be optimized in future fabrication runs, the current chip already merits telescope observations. The feasible sensitivity taking these effects into account is shown in a separate paper [16]. The fabrication of the on-chip filterbank will be discussed in detail in [17].…”

Section: The Chip Designmentioning

confidence: 99%

“…In the data-scientific method (SPLITTER [23]), off-source spectra are modeled before subtraction, which avoids "addition" of stochastic photon noise or two-level noise of the instrument 1 3 and interstellar heating sources such as AGNs, respectively. The feasibility of the survey is studied in a separate paper [16].…”

Section: Science Casesmentioning

confidence: 99%

DESHIMA 2.0: Development of an Integrated Superconducting Spectrometer for Science-Grade Astronomical Observations

et al. 2022

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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 ultrawideband 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 μm). The firstlight 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 datascientific approach. In the paper, we show the recent status of the upgrades and the plans for the scientific observation campaign.

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Data science based efficient and automated spectroscopy for submillimeter single-dish telescopes

Taniguchi,

Tamura,

Ikeda

et al. 2023

2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)

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Deshima 2.0: Rapid Redshift Surveys and Multi-line Spectroscopy of Dusty Galaxies

Cited by 3 publications

References 52 publications

Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

DESHIMA 2.0: Development of an Integrated Superconducting Spectrometer for Science-Grade Astronomical Observations

Data science based efficient and automated spectroscopy for submillimeter single-dish telescopes

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