2014/07/08 by Simona Lombardo, G. Aldering, Greg Aldering +10
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Calibration #Computer science #Field (mathematics) #Flux (metallurgy) #Geology #Geophysics and Gravity Measurements #Integral field spectrograph #Materials science #Mathematics #Optics #Physics #Remote sensing #Solar and Space Plasma Dynamics #Spectrograph #astro-ph.IM
paper · pdf · doi:10.1117/12.2055066
published as Proc. of SPIE Vol. 9147 91474R-1, 07/2014 · 11 pages, 6 figures
openalex publication_date 2014/07/08 · arxiv created 2014/11/12 · arxiv updated 2014/12/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Observational cosmology employing optical surveys often require precise flux calibration. In this context we present SNIFS Calibration Apparatus (SCALA), a flux calibration system developed for the SuperNova Integral Field Spectrograph (SNIFS), operating at the University of Hawaii 2.2 m telescope. SCALA consists of a hexagonal array of 18 small parabolic mirrors distributed over the face of, and feeding parallel light to, the telescope entrance pupil. The mirrors are illuminated by integrating spheres and a wavelength-tunable (from UV to IR) light source, generating light beams with opening angles of 1°. These nearly parallel beams are flat and flux-calibrated at a subpercent level, enabling us to calibrate our “telescope + SNIFS system” at the required precision.