Signal-to-Noise Ratios in IUE Low-Dispersion Spectra. II. Photometrically-Corrected Images

Abstract

The character of detector noise is explored in photometrically-corrected images from the shortwavelength and longwavelength prime intensified vidicon cameras of the International Ultraviolet Explorer. A protocol is proposed for deriving realistic "noise models"--crucial to the application of Optimal extraction algorithms like that of Kinney, Bohlin, and Neill (1991)--from the available collections of UV-Flood calibration images. The protocol includes evaluation of the "noise-filtering" properties of the SWP and LWP cameras through 2-D spatial power spectrum analysis. (SECTION: Instrumentation and Data Analysis)