Information for observers
WiFeS is a double-beam, image-slicing, integral-field spectrograph that records optical spectra over a contiguous 25 arcsec x 38 arcsec field of view. This spatial field is divided into twenty-five 1 arcsec wide “slitlets” with 0.5 arcsec sampling along the 38 arcsec lengths.
Both of the cameras for the blue and red channels are equipped with a 4k x 4k pixel CCD detector. The spectral range of the instrument extends from 330 to 920nm. This range can be observed in a single exposure of each of the red and blue cameras using the low-resolution grating configuration (R=3000) and in two exposures using the set of four high-resolution gratings (R=7000).
- Nasmyth focus, instrument de-rotator
- Concentric image-slicing IFU
- Field of view: 38 x 25 arcsec (25 slitlets that are 1 arcsec wide and 38 arcsec long)
- Wavelength coverage: 330 - 920 nm
- Detectors: 4096x4096 pixel Fairchild Imaging CCDs (red and blue cameras)
- Pixel size: 15 microns
- Pixel scale: 1 arcsec (slitlet width) x 0.5 arcsec (spatial sampling along slitlets)
For more information about the specifications and use of the WiFeS instrument, please download the following manuals:
|Grating||Ruling density (lines/mm)||Blaze wavelength (micron)||Resolution||Simultaneous coverage (nm)||Wavelength interval (nm)||Wave. Offset (pix)||Y offset|
See the publication Dopita et al. (2009) for detailed information about the performance of the instrument.
The measured final throughput of the instrument (and telescope) are plotted below for each grating (other than U7000).