The Cosmic Web Imager (CWI) --IFU And First Results

Details The Cosmic Web Imager (CWI) --IFU And First Results The Cosmic Web Imager (CWI) --IFU And First Results

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21531502c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #315.02; Bulletin of the American Astronomical Society, Vol. 42, p.315

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the Cosmic Web Imager (CWI), a new integral-field spectrograph that aims to detect and map emission from the intergalactic medium (IGM) using a unique combination of instrumental techniques. First, a mirror slicer Integral Field Unit (IFU) provides spatial as well as spectral information over a wide 60 x 40 arcsec2 field of view. Volume-Phase Holographic (VPH) gratings maximize peak diffraction efficiency and allow a single grating to cover a wide bandpass. Finally, a low read-noise large format e2v CCD combined with a source/background nod-and-shuffle observing pattern controls the systematics and allows for Poisson-limited sky subtraction. Our observations of the low surface brightness universe will focus on the strong UV resonance lines of Lyα 1216, CIV 1550, and OVI 1033 redshifted over 3800-9000 Å to trace IGM at 1 < z < 7. We will showcase our IFU design as well as present first light data.

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