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Wide-Field Spectrograph (WiFeS)
WiFeS is an integral-field, or imaging, spectrograph, which means that it records a range from each pixel for the area that is imaged. WiFeS ended up being created and built at RSAA and set up during the telescope that is 2.3m might 2009. The look attracts upon the history of both the RSAA’s Dual-Beam Spectrograph (DBS), together with concentric image-slicer concept for the Near-infrared Integral-Field Spectrograph (NIFS) that has been produced by RSAA for the Gemini Observatory.
WiFeS was designed to deliver as numerous spectra that is simultaneous feasible over a consistent area associated with the sky, each covering since wide a spectral range as you can. It runs throughout the complete wavelength range that is optical. Two split digital digital cameras are widely used to record the spectra, each optimised for a part that is particular of wavelength range. Extra information about spectroscopy and exactly how WiFeS works can be obtained into this article WiFeS plus the art work of spectroscopy.
WiFeS has been useful for a range that is wide of applications, including:
- Findings of enigmatic, extremely remote Gamma-Ray Bursts
- Studies of old movie stars within our Galaxy that will offer information regarding exactly how it absolutely was put together
- Studies of mass being ejected from young movie movie stars which are nevertheless being created and generally are much like our Sun, to know exactly just how planets form
- Dimensions regarding the interior motions in galaxies to look for black colored holes within their cores and dark matter in their exterior components
- Studies regarding the motions of gas around remote quasars and radio galaxies.
Fundamental specs
- Field of view: 38 x 25 arcsec (25 slitlets which are 1 arcsec wide and 38 arcsec long)
- Wavelength protection: 330 – 900 nm
- Detectors: 4096 x 4096 pixel Fairchild Imaging CCD in each digital digital camera
- Pixel size: 15 microns
- Pixel scale: 1 arcsec (slitlet width) x 0.5 arcsec (spatial sampling along slitlets)
Information for observers
WiFeS is really a double-beam, image-slicing, integral-field spectrograph that records optical spectra more than a contiguous 25 arcsec x 38 arcsec industry of view. This spatial industry is divided in to twenty-five 1 arcsec wide “slitlets” with 0.5 arcsec sampling over the 38 arcsec lengths.
Both associated with the digital digital cameras for the blue and red networks are built with a x that is 4k pixel CCD detector. The spectrum of the tool runs from 330 to 920nm. This range may be noticed in a solitary publicity of every of the red and blue digital digital digital cameras utilising the low-resolution grating setup (R=3000) as well as in two exposures with the group of four high-resolution gratings (R=7000).
Specs
- Nasmyth focus, instrument de-rotator
- Concentric image-slicing IFU
- Field of view: 38 x 25 arcsec (25 slitlets which are 1 arcsec wide and 38 arcsec long)
- Wavelength protection: 330 – 920 nm
- Detectors: 4096×4096 pixel Fairchild Imaging CCDs (red and cameras that are blue
- Pixel size: 15 microns
- Pixel scale: 1 arcsec (slitlet width) x 0.5 arcsec (spatial sampling along slitlets)
To find out more concerning the specifications and use regarding the WiFeS tool, please down load the documents exhibited in the right hand part regarding the web page and also you may additionally find useful listed here website:
WiFeS gratings
| Grating | Ruling density (lines/mm) | Blaze wavelength (micron) | quality | Simultaneous coverage (nm) | Wavelength period (nm) | Wave. Offset (pix) | Y offset | |
|---|---|---|---|---|---|---|---|---|
| U7000 | 1948 | 0.385 | 7000 | 0.109 | 0.329 | 0.438 | 0 | 0 |
| B7000 | 1530 | 0.49 | 7000 | 0.14 | 0.418 | 0.558 | 0 | 0 |
| R7000 | 1210 | 0.62 | 7000 | 0.177 | 0.529 | 0.706 | 0 | 0 |
| I7000 | 937 | 0.8 | 7000 | 0.229 | 0.683 | 0.91 | 0 | 0 |
| B3000 | 708 | 0.468 | 3000 | 0.27 | 0.32 | 0.59 | 0 | 0 |
| R3000 | 398 | 0.742 | 3000 | 0.45 | 0.53 | 0.98 | 0 | 0 |
Performance
See the book Dopita et al. (2009) for detailed information on the performance of this tool.
Measured throughput
The calculated throughput that is final of tool (and telescope) are plotted below for every single grating (aside from U7000).