Optical throughput and sensitivity of JWST NIRSpec

Giovanna Giardino; Rachana Bhatawdekar; Stephan M. Birkmann; Pierre Ferruit; Timothy Rawle; Catarina Alves de Oliveira; Torsten Boker; Peter Jakobsen; Nimisha Kumari; Marcos Lopez-Caniego; Nora Lutzgendorf; Elena Manjavacas; Charles Proffitt; Marco Sirianni; Maurice Te Plate; Peter Zeidler

doi:10.1117/12.2628980

Optical throughput and sensitivity of JWST NIRSpec

Giovanna Giardino^*, Rachana Bhatawdekar, Stephan M. Birkmann, Pierre Ferruit, Timothy Rawle, Catarina Alves de Oliveira, Torsten Boker, Peter Jakobsen, Nimisha Kumari, Marcos Lopez-Caniego, Nora Lutzgendorf, Elena Manjavacas, Charles Proffitt, Marco Sirianni, Maurice Te Plate, Peter Zeidler

^*Corresponding author af dette arbejde

The Cosmic Dawn Center

Publikation: Bidrag til tidsskrift › Konferenceartikel › Forskning › peer review

8 Citationer (Scopus)

26 Downloads (Pure)

Abstract

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.

Originalsprog	Engelsk
Artikelnummer	121800X
Tidsskrift	Proceedings of SPIE
Vol/bind	12180
Antal sider	7
ISSN	0277-786X
DOI	https://doi.org/10.1117/12.2628980
Status	Udgivet - 27 sep. 2022
Begivenhed	Conference on Space Telescopes and Instrumentation - Optical, Infrared, and Millimeter Wave - Montreal, Canada Varighed: 17 jul. 2022 → 22 jul. 2022

Konference

Konference	Conference on Space Telescopes and Instrumentation - Optical, Infrared, and Millimeter Wave
Land/Område	Canada
By	Montreal
Periode	17/07/2022 → 22/07/2022

Adgang til dokumentet

10.1117/12.2628980

121800XForlagets udgivne version, 1,1 MBLicens: CC BY

Citationsformater

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, 12180, Artikel 121800X. https://doi.org/10.1117/12.2628980

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abstract = "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.",

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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

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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.

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