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Order Format:

The order format for CorMASS is roughly that of a typical 2d echelle instrument. CorMASS's main disperser is a 40 groove/mm reflection grating blazed at 4.8 microns. Eight orders are imaged onto two quadrants of a 256x256 NICMOS3 detector. These are orders 2-9. Order 2 is at the bottom of the raw image (at the top when you view it in Cormasstool) and covers the redward end of CorMASS's spectral coverage, i.e. K-band. It is the order that goes only halfway across the array and has very bright emission as it cuts off at the middle of the array. Orders 8 and 9 are in the top right corner (see figure below). Realistic order and wavelength coverage for most objects is orders 2-6, with corresponding wavelength coverage of 2.4 to 0.75 microns. All orders have significant overlap except between orders 2 and 3 (in K-band) where there is a very tiny overlap.

For additional information please e-mail John Wilson: jcw6z@virginia.edu.


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