SCALA upgrade: development of a light source for sub-percent calibration uncertainties - Archive ouverte HAL
Communication Dans Un Congrès Année : 2020

SCALA upgrade: development of a light source for sub-percent calibration uncertainties

Daniel Küsters
  • Fonction : Auteur
Benjamin Bastian-Querner
  • Fonction : Auteur
Greg Aldering
  • Fonction : Auteur
Summer Blot
  • Fonction : Auteur
Kyle Boone
  • Fonction : Auteur
Dustin Hebecker
  • Fonction : Auteur
Timo Karg
  • Fonction : Auteur
Marek Kowalski
  • Fonction : Auteur
Jakob Nordin
  • Fonction : Auteur
David Rubin
  • Fonction : Auteur

Résumé

The SCALA system provides a physical flux calibration for the SuperNova Integral Field Spectrograph (SNIFS) mounted to the University of Hawaii 2.2m telescope on Mauna Kea by transferring the flux scale from a NIST- traceable photodiode to SNIFS. This calibration is then applied to CALSPEC standard stars.1 We thereby remove stellar atmospheric models from the calibration chain. Measurement results for supernova cosmology are directly improved, as systematic uncertainties in the flux calibration limit them. Using the existing SCALA setup (2–5) we achieved a calibration that agrees with the CALSPEC and Hayes6 systems to within ∼ 4 mmag / 1000 ̊A over a wavelength range from 4500 ̊A to 9000 ̊A. We are now upgrading the SCALA system to reach measurement uncertainties below 0.5 %. To provide the flux references for the new system and to perform tests of the improved components, we have built a laboratory light source enabling measurements with sub-percent uncertainties. The light source provides monochromatic light (FWHM 1.8/3.6 nm) spanning UV to IR, with wavelength accuracy and reproducibility of ≤1 ̊A. Neutral density filters enable fluxes that induce photodiode currents between fA and μA. A subsystem allows linearity testing for detectors with their readout system. Using a gantry robot, we can measure our detectors’ spatial response and angular acceptance with active areas up to 0.5 m2
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Dates et versions

hal-04031861 , version 1 (16-03-2023)

Identifiants

Citer

Daniel Küsters, Benjamin Bastian-Querner, Greg Aldering, Summer Blot, Kyle Boone, et al.. SCALA upgrade: development of a light source for sub-percent calibration uncertainties. SPIE Astronomical Telescopes + Instrumentation 2020, Dec 2020, Online, United States. pp.1144771, ⟨10.1117/12.2561602⟩. ⟨hal-04031861⟩
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