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The JWST resolved stellar populations early release science program I.: NIRCam Flux Calibration
journal contribution
posted on 2023-05-21, 19:40 authored by Boyer, ML, Anderson, J, Gennaro, M, Geha, M, Wingfield McQuinn, KB, Tollerud, E, Correnti, M, Brenner Newman, MJ, Cohen, RE, Kallivayalil, N, Beaton, R, Andrew ColeAndrew Cole, Dolphin, A, Kalirai, JS, Sandstrom, KM, Savino, A, Skillman, ED, Weisz, DR, Williams, BFWe use globular cluster data from the Resolved Stellar Populations Early Release Science (ERS) program to validate the flux calibration for the Near Infrared Camera (NIRCam) on the James Webb Space Telescope. We find a significant flux offset between the eight short wavelength detectors, ranging from 1% to 23% (~0.01-0.2 mag) that affects all NIRCam imaging observations. We deliver improved zero-points for the ERS filters and show that alternate zero-points derived by the community also improve the calibration significantly. We also find that the detector offsets appear to be time variable by up to at least 0.1 mag.
History
Publication title
American Astronomical Society. BulletinVolume
6Pagination
1-5ISSN
2330-9458Department/School
School of Natural SciencesPublisher
American Astronomical SocietyPlace of publication
United StatesRepository Status
- Restricted