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Geometric distortion and astrometric calibration of the JWST MIRI Medium Resolution Spectrometer by Patapis, P.; Argyriou, I.; Law, D. R.; Glauser, A. M.; Glasse, A.; Labiano, A.; Álvarez-Márquez, J.; Kavanagh, P. J.; Gasman, D.; Mueller, M.; Larson, K.; Vandenbussche, B.; Klaassen, P.; Guillard, P.; Wright, G. S. is a scholarly article available to read on EtoBox.

What is Geometric distortion and astrometric calibration of the JWST MIRI Medium Resolution Spectrometer about?

The Medium-Resolution integral field Spectrometer (MRS) of MIRI on board JWST performs spectroscopy between 5 and 28~$\mu$m. The optics of the MRS introduce substantial distortion, and this needs to be rectified in order to reconstruct the observed astrophysical scene. We use data from the JWST/MIRI commissioning and cycle 1 calibration phase, to derive the MRS geometric distortion and astrometric solution, a critical step in the calibration of MRS data. These solutions come in the form of transform matrices that map the detector pixels to spatial coordinates of a local MRS coordinate system called $\alpha$/$\beta$, to the global JWST observatory coordinates V2/V3. For every MRS spectral band and each slice dispersed on the detector, the transform of detector pixels to $\alpha$/$\beta$ is fit by a two-dimensional polynomial, using a raster of point source observations. A polynomial transform is used to map the coordinates from $\alpha$/$\beta$ to V2/V3. We calibrated the distortion of all 198 discrete slices of the MIRI/MRS IFUs, and derived an updated Field of View (FoV) for each MRS spectral band. The precision of the distortion solution is estimated to be better than one tenth o

Author

Patapis, P.; Argyriou, I.; Law, D. R.; Glauser, A. M.; Glasse, A.; Labiano, A.; Álvarez-Márquez, J.; Kavanagh, P. J.; Gasman, D.; Mueller, M.; Larson, K.; Vandenbussche, B.; Klaassen, P.; Guillard, P.; Wright, G. S.

Published

2023

Language

EN