Exposure Time & S/N Calculators for NICMOS

Details Exposure Time & S/N Calculators for NICMOS Exposure Time & S/N Calculators for NICMOS

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996nicm.rept...15s&link_type=abstract

Instrument Science Report NICMOS-015, 12 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

We describe a small suite of tools which have been developed to assist in the estimation of S/N ratios and exposure times for NICMOS observations. Included are tools for determining S/N as a function of time for observing a known source, and tools for determining flux as a function of time for a fixed S/N, and tools to determine, as a function of time, the range of fluxes for which an observations is neither detector noise limited nor saturated. All these tools are available in versions for either point sources or extended sources. Finally, a similar set of tools is available for Multi-Object Spectroscopy using NICMOS’s grisms. We provide a detailed description of the physical basis and techniques for each of the tools, as well as a brief description of how to use them.

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