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First results from the 3D near-infrared imaging array spectrometer

We present the first astronomical results from the new 3D near IR imaging array spectrometer. These include K band (1.95 to 2.45 micrometers ) spectra and images of nearby starburst galaxies and active galactic nuclei with a spectral resolution of 1000. A special image slicer allows simultaneous spectra and imaging of an 8 arc second field of view. The background limited performance achieved by this instrument represents an order of magnitude reduction in integration time over existing near IR cameras and spectrometers. In addition, subtraction of atmospheric OH lines may be performed with far higher accuracy. We discuss the data reconstruction procedure, with special emphasis on flat fielding and calibration of the detector. This is complicated by the scrambled image format, which results in adjacent image pixels being widely separated on the detector. Small non linearities of the optical elements must also be dealt with carefully. We also discuss future improvements to instrument performance, including a low order adaptive optics system for compensating atmospheric turbulence.