How Dark the Sky: The JWST Backgrounds
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 performan...
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| Veröffentlicht in: | Publications of the Astronomical Society of the Pacific 2023-04, Vol.135 (1046), p.48002 |
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| creator | Rigby, Jane R. Lightsey, Paul A. García Marín, Macarena Bowers, Charles W. Smith, Erin C. Glasse, Alistair McElwain, Michael W. Rieke, George H. Chary, Ranga-Ram Liu, Xiang (Cate) Clampin, Mark Kimble, Randy A. Kinzel, Wayne Laidler, Vicki Mehalick, Kimberly I. Noriega-Crespo, Alberto Shivaei, Irene Skelton, Dennis Stark, Christopher Temim, Tea Wei, Zongying Willott, Chris J. |
| description | 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 |
| doi_str_mv | 10.1088/1538-3873/acbcf4 |
| format | Article |
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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.</description><identifier>ISSN: 0004-6280</identifier><identifier>ISSN: 1538-3873</identifier><identifier>EISSN: 1538-3873</identifier><identifier>DOI: 10.1088/1538-3873/acbcf4</identifier><language>eng</language><publisher>Goddard Space Flight Center: The Astronomical Society of the Pacific</publisher><subject>Astronomical instrumentation ; Astrophysics ; Infrared astronomy ; Observatories ; Sky brightness ; Wavelengths</subject><ispartof>Publications of the Astronomical Society of the Pacific, 2023-04, Vol.135 (1046), p.48002</ispartof><rights>2023. The Author(s). 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| source | IOP Publishing Journals; NASA Technical Reports Server; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Astronomical instrumentation Astrophysics Infrared astronomy Observatories Sky brightness Wavelengths |
| title | How Dark the Sky: The JWST Backgrounds |
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