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WFC3/HST photometric calibration: color terms for the ultra-violet filters
Published online by Cambridge University Press: 03 March 2020
Extract
Color term corrections for magnitudes measured on the UVIS2 relative to the UVIS1 detector of the WFC3 camera on board Hubble Space Telescope are needed for three ultra-violet filters, namely F218W, F225W, and F275W. The two WFC3 detectors have different quantum efficiencies in the ultra-violet regime (λ < 4,000 Å), resulting in different count rate ratios as a function of the spectral type of the source. In the worst case, for cool red sources measured on UVIS2, there is a magnitude offset relative to UVIS1 up to ∼ 0.08 mag, while the offset is negligible for hot (Teff ≳ 30,000 K) blue sources.
- Type
- Contributed Papers
- Information
- Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 492
- Copyright
- © International Astronomical Union 2020