The Keck Cosmic Web Imager Integral Field Spectrograph
| Autor: | Sam Park, Jerry Cabak, Jason Weiss, Marty Crabill, Constance M. Rockosi, Bob Weber, Greg Doppman, Kirk Seaman, Luca Rizzi, Anna M. Moore, Ray Zarzaca, Shui Kwok, Donal O'Sullivan, Steve Allen, James D. Neill, Harland W. Epps, W. Deich, Justin Belicki, Kyle Lanclos, Shawn Callahan, M. Matuszewski, Michael Kokorowski, Jason Fucik, Patrick Morrissey, Steve Kaye, Sean M. Adkins, Dave Cowley, Prachi Parihar, Andrew N. Phillips, Randy Bartos, David Sheikh, Hector P. Rodriguez, Yves Salaun, Alex Delecroix, Steve Milner, Ean James, D. Christopher Martin, Behnam Darvish, David F. Hilyard |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
business.industry media_common.quotation_subject Holography FOS: Physical sciences Astronomy and Astrophysics Field of view 01 natural sciences law.invention 010309 optics Telescope Wavelength Optics Integral field spectrograph Space and Planetary Science Observatory Sky law 0103 physical sciences Spectral resolution business Astrophysics - Instrumentation and Methods for Astrophysics 010303 astronomy & astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) media_common |
| Popis: | We report on the design and performance of the Keck Cosmic Web Imager (KCWI), a general purpose optical integral field spectrograph that has been installed at the Nasmyth port of the 10 m Keck II telescope on Mauna Kea, HI. The novel design provides blue-optimized seeing-limited imaging from 350-560 nm with configurable spectral resolution from 1000 - 20000 in a field of view up to 20"x33". Selectable volume phase holographic (VPH) gratings and high performance dielectric, multilayer silver and enhanced aluminum coatings provide end-to-end peak efficiency in excess of 45% while accommodating the future addition of a red channel that will extend wavelength coverage to 1 micron. KCWI takes full advantage of the excellent seeing and dark sky above Mauna Kea with an available nod-and-shuffle observing mode. The instrument is optimized for observations of faint, diffuse objects such as the intergalactic medium or cosmic web. In this paper, a detailed description of the instrument design is provided with measured performance results from the laboratory test program and ten nights of on-sky commissioning during the spring of 2017. The KCWI team is lead by Caltech and JPL (project management, design and implementation) in partnership with the University of California at Santa Cruz (camera optical and mechanical design) and the W. M. Keck Observatory (observatory interfaces). 33 pages, 31 figures. Accepted to the Astrophysical Journal |
| Databáze: | OpenAIRE |
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