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CHAPTER 6
Exposure Time Calculations

In This Chapter...

Overview / 89
Calculating NICMOS Imaging Sensitivities / 92
WWW Access to Imaging Tools / 97
Examples / 97

In this chapter we provide NICMOS-specific performance information needed to prepare a NICMOS Phase I proposal for Cycle 7-NICMOS. First, we discuss various parameters that affect performance, and the extent to which they are known. Next, we describe how to determine the system sensitivity. We then describe the ways in which you can determine the exposure time required for a given observation and the signal to noise that will be achieved; examples are provided. We describe several computer programs that will perform these calculations and which are available on the WWW. These programs may be used to calculate the sensitivity and exclusion curves for the NICMOS filters, polarizers, and grisms, discussed elsewhere in this Handbook. We also describe how to calculate signal to noise ratios and exposure times by hand for NICMOS.

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CHAPTER 6 Exposure Time Calculations

CHAPTER 6
Exposure Time Calculations