| The 2005 HST Calibration Workshop (2009) | |||||||||||||
Abstract | |||||||||||||
| Abstract. We compared photometry for the same sources as measured by NIC-MOS and ground-based ISAAC detectors over a large dynamic range. Over a range of magnitudes from 8- 25, we find a linear offset in the F110W filter with respect to ground-based J-band once the data are corrected for differences in J-band filters. No offset or non-linearity is observed between F160W and ground-based H-band data. Comparing NICMOS photometry for faint objects in HUDF, reduced in two independent ways, we find a difference of 0.04-0.08 mag between the two datasets. This is completely independent from the filter shapes and detector sensitivities and only depends on the way the cosmic ray and sky subtraction is applied. Allowing for dependence of flat fields on zero-points, slightly increases the offset. 1. | |||||||||||||
Details der Publikation | |||||||||||||
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