CGS4 Arc Maps

CGS4 Arc Maps

List of available arc spectra.

Below is a list of arc spectra obtained with CGS4 at UKIRT. You may use these to help wavelength calibrate your CGS4 data both during and after your run. Currently, only low resolution spectra (75 l/mm grating, short focal length camera) are available on the web.

Lamp lines in the 3 to 5 micron region cannot be observed due to absorption by the lamp bulb glass. However, you can obtain lines in this region by observing 1 and 2 micron arc lines in 2nd order. In the spectra listed below, we have not indicated the wavelength value in 1st order for lines beyond 3 microns. If you are interested in this number, simply divide the indicated value by 2.

PNG files: