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Resolution and Noise Properties of the Goddard High Resolution Spectrograph

Ebbets, Dennis C.; Morris, Simon L.; Gilliland, Ronald L. +2 more

The Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) provides an unprecedented capability for ultraviolet spectroscopy of a wide range of astronomical targets. The combination of high resolution (to R 100,000), good sensitivity (maximum total system quantum efficiency of 1%), low background noise (order 0.01 counts s…

Astrometric Performance Characteristics of the Hubble Space Telescope Fine Guidance Sensors

Benedict, G. F.; Franz, O. G.; Hemenway, P. D. +10 more

Each of the three Fine Guidance Sensors for the Hubble Space Telescope constitutes a sixth science instrument to be used for astrometry. We detail the tests and results used in choosing one of the three sensors to be the prime astrometer. The Astrometry Science team has chosen Fine Guidance Sensor (FGS) 3. FGS 3 produces position measurements on a…

A Deconvolution Technique for Hubble Space Telescope FGS Fringe Analysis

Hershey, John L.

A technique has been developed for directly transforming interferometer fringe visibility functions (``S-curves") from the HST Fine Guidance Sensors (FGSs) into intensity profiles of the program object. In a process analogous to Fourier transform image deconvolution, an S-curve from a double star yields a pair of narrow profiles containing informa…

High Resolution Imaging of QSO 2305+187 (=4C 18.68)

Hutchings, J. B.; Neff, S. G.; Crabtree, D. +1 more

We present optical imaging of QSO 2305+187 with resolution ranging from 0.1 to 1.0 arcsec, in continuum and line emission. The data are from FOCAM and the HR Cam of the Canada-France-Hawaii telescope, and the Wide Field Camera of the Hubble Space Telescope. These are compared with previously published optical and radio images. The QSO host galaxy …