Optical throughput and sensitivity of JWST NIRSpec
| Autor: | Giovanna Giardino, Rachana Bhatawdekar, Stephan M. Birkmann, Pierre Ferruit, Tim Rawle, Catarina Alves de Oliveira, Torsten Böker, Peter Jakobsen, Nimisha Kumari, Marcos Lopez-Caniego, Nora Lützgendorf, Elena Manjavacas, Charles Proffitt, Marco Sirianni, Maurice Te Plate, Peter Zeidler |
|---|---|
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Giardino, G, Bhatawdekar, R, Birkmann, S M, Ferruit, P, Rawle, T, Alves de Oliveira, C, Boker, T, Jakobsen, P, Kumari, N, Lopez-Caniego, M, Lutzgendorf, N, Manjavacas, E, Proffitt, C, Sirianni, M, Te Plate, M & Zeidler, P 2022, ' Optical throughput and sensitivity of JWST NIRSpec ', Proceedings of SPIE, vol. 12180, 121800X . https://doi.org/10.1117/12.2628980 |
| DOI: | 10.48550/arxiv.2208.04876 |
| Popis: | 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 micron, and exceed +30%, below 2 micron. 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. Comment: 7 pages, 6 figures - to appear in Proceedings of SPIE conference "Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave" |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|