A high throughput imager at near-ultraviolet wavelengths for a ground-based telescope

Hiroshi Akitaya; Tomoki Morokuma; Koji S. Kawabata

doi:10.1117/12.3013630

18 July 2024 A high throughput imager at near-ultraviolet wavelengths for a ground-based telescope

Hiroshi Akitaya, Tomoki Morokuma, Koji S. Kawabata

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130963G (2024) https://doi.org/10.1117/12.3013630
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We are developing an imager with high throughput in near-ultraviolet wavelengths (300-400 nm) for a ground-based telescope. The transmittance in this wavelength range has been given the highest priority by optimizing the optical design and detector selection. Including the atmosphere and telescope optics, we expect the peak efficiency of the imager as around 32 percent in the u-band from model calculations. The expected limiting magnitude with a signal-to-noise ratio of five is about 20.2 AB magnitudes for 100 seconds of exposure in the u-band. This allows us to detect NUV emission from nearby transient objects, for example, a kilonova from a neutron star merger closer than 130 Mpc within a day after its collapse. In March 2024, we conducted the first on-sky observations of the imager at the 1.5-m Kanata Telescope at Higashi-Hiroshima Observatory. Some of the instrument specifications have been confirmed to be as designed through preliminary analyses.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Hiroshi Akitaya, Tomoki Morokuma, and Koji S. Kawabata "A high throughput imager at near-ultraviolet wavelengths for a ground-based telescope", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130963G (18 July 2024); https://doi.org/10.1117/12.3013630

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