The James Webb Space Telescope Absolute Flux Calibration. IV. Near-Infrared Imager and Slitless Spectrograph Imaging

• Published in: The Astronomical journal Vol. 170; no. 3; pp. 136 - 149
• Main Authors: Volk, Kevin, Goudfrooij, Paul
• Format: Journal Article
• Language: English
• Published: The American Astronomical Society 01.09.2025; IOP Publishing
• Subjects: Flux calibration; Infrared astronomy; James Webb Space Telescope

The absolute flux calibration of the Near-infrared Imager and Slitless Spectrograph (NIRISS) imaging modes is derived using observations of photometric standards with the James Webb Space Telescope (JWST). The calibration converts the ramp slope to a mean surface brightness in MJy sr −1 , and is mea...