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Cosmic Web Imager (CWI) Technical Specifications
View the original specsheet.
The Cosmic Web Imager (CWI) is a P200 instrument and prototype developed by Chris Martin and colleagues at Caltech. CWI is available for science observing in a semi-private mode (potential users must contact/work with the CWI team).
| Parameter | Value |
|---|---|
| Status | Semi-private (contact cmartin@srl.caltech.edu) |
| Field of view | 60″ × 40″ |
| Spatial resolution | 2.5 × 1″ |
| Field orientation | Adjustable 0° to 90° |
| Available Gratings | 385 – 560 nm: MedRez/Richardson 460 – 550 nm: Blue 555 – 690 nm: Yellow 640 – 770 nm: Red |
| Available Filters | Asahi/UV g'/Blue r'/Red i'/IR |
| Spectral bandpass | ~
15 nm Nod & Shuffle ~ 45 nm unmasked |
| Spectral resolution (R = λ/Δλ) | 5000 (Δλ ~ 0.1 nm) |
| Estimated efficiency | 10% [a] |
| CCD format | 4096 × 4096 |
| Pixel size | 15 µm |
| Pixel binning | 1 × 1, 2 × 2 |
| Read noise | < 2.8 e− |
| Readout time (2x2) | 2, 1, or 0.5 min (through 1, 2, or 4 amplifers) |
| Scripted Nod & Shuffle | Yes |
| [a] Estimated efficiency: ~10−18 ergs/cm2/s/arcsec2 after 3 hours on target and 3 hours on background. | |
An expanded CWI observer's writeup has been provided by the CWI team, and a CWI web-page is also available.
Questions? We've answered many common observing and operations questions in our observer FAQ page.
Please share your feedback on this page or any other Palomar topic at the
COO Feedback portal.
CWI Specs / v 2.0.1
Last updated: 17 November 2019 KMR
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