Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..367g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 675, May 1992, p. 367-382.
Astronomy and Astrophysics
Astronomy
31
Astronomical Spectroscopy, Hubble Space Telescope, Satellite-Borne Instruments, Spectrographs, Ultraviolet Spectroscopy, Absorption Spectra, Background Noise, High Resolution, Lagrange Multipliers, Signal To Noise Ratios
Scientific paper
The Goddard High-Resolution Spectrograph (GHRS) observation characteristics and data analysis procedures, including deconvolution, are discussed. Particular attention is given to the detection of weak absorption lines in low-signal-to-noise observations. It is found that observations with the GHRS large aperture provide greater sensitivity for the detection of weak, isolated spectral features than does the small aperture for equal observing times. The noise characteristics are well represented by a Poisson distribution at low signal-to-noise characteristics. It is proposed that GHRS observations should be routinely structured with the use of comb-addition, quarter-substepping, FP-SPLITS, and multiple repeats to enable the proper discrimination against noise events capable of mimicking spectral features.
Ebbets Dennis C.
Gilliland Ronald L.
Lindler Don J.
Morris Simon L.
Weymann Ray J.
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