Optical throughput and sensitivity of JWST NIRSpec
Publikation: Bidrag til tidsskrift › Konferenceartikel › Forskning › fagfællebedømt
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Optical throughput and sensitivity of JWST NIRSpec. / Giardino, Giovanna; Bhatawdekar, Rachana; Birkmann, Stephan M.; Ferruit, Pierre; Rawle, Timothy; Alves de Oliveira, Catarina; Boker, Torsten; Jakobsen, Peter; Kumari, Nimisha; Lopez-Caniego, Marcos; Lutzgendorf, Nora; Manjavacas, Elena; Proffitt, Charles; Sirianni, Marco; Te Plate, Maurice; Zeidler, Peter.
I: Proceedings of SPIE, Bind 12180, 121800X, 27.09.2022.Publikation: Bidrag til tidsskrift › Konferenceartikel › Forskning › fagfællebedømt
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TY - GEN
T1 - Optical throughput and sensitivity of JWST NIRSpec
AU - Giardino, Giovanna
AU - Bhatawdekar, Rachana
AU - Birkmann, Stephan M.
AU - Ferruit, Pierre
AU - Rawle, Timothy
AU - Alves de Oliveira, Catarina
AU - Boker, Torsten
AU - Jakobsen, Peter
AU - Kumari, Nimisha
AU - Lopez-Caniego, Marcos
AU - Lutzgendorf, Nora
AU - Manjavacas, Elena
AU - Proffitt, Charles
AU - Sirianni, Marco
AU - Te Plate, Maurice
AU - Zeidler, Peter
PY - 2022/9/27
Y1 - 2022/9/27
N2 - To achieve its ambitious scientific goals, the Near-Infrared Spectrograph, NIRSpec, on board the Webb Space Telescope, needs to meet very demanding throughput requirements, here quantified in terms of photon-conversion efficiency (PCE). During the calibration activities performed for the instrument commissioning, we have obtained the first in-flight measurements of its PCE and also updated the modeling of the light losses occurring in the NIRSpec slit devices.The measured PCE of NIRSpec fixed-slit and multi-object spectroscopy modes overall meets or exceeds the pre-launch model predictions. The results are more contrasted for the integral-field spectroscopy mode, where the differences with the model can reach -20%, above 4 mu m, and exceed +30%, below 2 mu m. Additionally, thanks to the high quality of the JWST point-spread function, our slit-losses, at the shorter wavelength, are significantly decreased with respect to the pre-flight modeling.These results, combined with the confirmed low noise performance of the detectors, make of NIRSpec an exceptionally sensitive spectrograph.
AB - To achieve its ambitious scientific goals, the Near-Infrared Spectrograph, NIRSpec, on board the Webb Space Telescope, needs to meet very demanding throughput requirements, here quantified in terms of photon-conversion efficiency (PCE). During the calibration activities performed for the instrument commissioning, we have obtained the first in-flight measurements of its PCE and also updated the modeling of the light losses occurring in the NIRSpec slit devices.The measured PCE of NIRSpec fixed-slit and multi-object spectroscopy modes overall meets or exceeds the pre-launch model predictions. The results are more contrasted for the integral-field spectroscopy mode, where the differences with the model can reach -20%, above 4 mu m, and exceed +30%, below 2 mu m. Additionally, thanks to the high quality of the JWST point-spread function, our slit-losses, at the shorter wavelength, are significantly decreased with respect to the pre-flight modeling.These results, combined with the confirmed low noise performance of the detectors, make of NIRSpec an exceptionally sensitive spectrograph.
KW - JWST
KW - NIRSpec
KW - near-infrared spectrograph
KW - INFRARED SPECTROGRAPH NIRSPEC
U2 - 10.1117/12.2628980
DO - 10.1117/12.2628980
M3 - Conference article
VL - 12180
JO - Progress in Biomedical Optics and Imaging
JF - Progress in Biomedical Optics and Imaging
SN - 1605-7422
M1 - 121800X
T2 - Conference on Space Telescopes and Instrumentation - Optical, Infrared, and Millimeter Wave
Y2 - 17 July 2022 through 22 July 2022
ER -
ID: 325336278