تقرير
How Dark the Sky: The JWST Backgrounds
| العنوان: | How Dark the Sky: The JWST Backgrounds |
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| المؤلفون: | Jane R. Rigby, Paul A. Lightsey, Macarena Garcıa Marin, Charles W. Bowers, Erin C. Smith, Alistair Glasse, Michael W. McElwain, George H. Rieke, Ranga–Ram Chary, Xiang (Cate) Liu, Mark Clampin, Randy A. Kimble, Wayne Kinzel, Vicki Laidler, Kimberly I. Mehalick, Alberto Noriega-Crespo, Irene Shivaei, Dennis Skelton, Christopher Stark, Tea Temim, Zongying Wei, Christ J. Willott |
| المصدر: | Publications of the Astronomical Society of the Pacific. 135(1046) |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2023. |
| سنة النشر: | 2023 |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | We describe the sources of stray light and thermal background that affect JWST observations; report actual backgrounds as measured from commissioning and early science observations; compare those background levels to pre-launch predictions; estimate the impact of the backgrounds on science performance; and explore how the backgrounds probe the achieved configuration of the deployed observatory. We find the observatory is limited by the irreducible astrophysical backgrounds, rather than scattered stray light and thermal self-emission, for all wavelengths λ<12.5 micron, thus meeting the level 1 requirement. This result was not assured given the open architecture and thermal challenges of JWST, and is the result of meticulous attention to stray light and thermal issues in the design, construction, integration, and test phases. From background considerations alone, JWST will require less integration time in the near-infrared compared to a system that just met the stray light requirements; as such, JWST will be even more powerful than expected for deep imaging at 1--5 micron. In the mid-infrared, the measured thermal backgrounds closely match pre-launch predictions. The background near 10 micron is slightly higher than predicted before launch, but the impact on observations is mitigated by the excellent throughput of MIRI, such that instrument sensitivity will be as good as expected pre-launch. These measured background levels are fully compatible with JWST's science goals and the Cycle 1 science program currently underway. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1538-3873 |
| DOI: | 10.1088/1538-3873/acbcf4 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20230002366 |
| ملاحظات: | 411672 NAS5-02200 GSFC - 660.0 MOU - JWST ESA NAS5-02105 NAS5-03127 |
| رقم الأكسشن: | edsnas.20230002366 |
| قاعدة البيانات: | NASA Technical Reports |
Full Text Finder | تدمد: | 15383873 |
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| DOI: | 10.1088/1538-3873/acbcf4 |