Application Of A Dual-Array Self-Scanned Digicon To Faint Object Spectroscopy

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Abstract
A series of Self-Scanned Digicon image detectors has been constructed in which the target of the photoelectron imaging section is a Reticon type RL-1872F self-scanned photodiode array modified as a 2 X 936-element dual array. This paper describes an application in which the dual array is used for simultaneous spectroscopy of a faint object and a neighboring patch of skylight, Performance in this application has been tested using a Cassegrain spectrograph built for these tests and the 2.1 m Struve telescope at McDonald Observatory. Tests performedduring the course of several observing programs have demonstrated that subtraction of background skylight is complete to within limits set by photoelectron shot noise. Radial velocities of galaxies have been measured to a precision of ± 34 km/sec to v = 13,700 km/sec. The paper describes the detector, the spectrograph, the observing techniques, and the observational results.

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