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Synphot Data User's Guide

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2.1 Ramp filters (ACS, WFPC2)


2.1.1 ACS

Fifteen ramp filters are available for use with the WFC detector, and six are available for use with the HRC detectors. To use the ramp filters in simulations, use the keyword syntax ffff#wwww, where ffff is the filter and wwww is the desired central wavelength, specified in Angstroms, e.g., obsmode="acs,wfc,fr388n#3880".

2.1.2 WFPC2

Filter wheel 12 contains four linearly variable narrowband ramp filters, which together cover a total wavelength range of 3700 to 9800 . The FWHM of the throughput at a given wavelength is typically about 1% of the central wavelength. The ramp filters have been implemented as a parameterized component in synphot. To use the ramp filters in simulations, use the keyword syntax lrf#wwww, where wwww is the desired central wavelength,, specified in Angstroms, e.g., obsmode="wfpc2,3,lrf#4861".


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