Measured Throughput and Bandpass of the Ramp Filters

Details Measured Throughput and Bandpass of the Ramp Filters Measured Throughput and Bandpass of the Ramp Filters

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000acs..rept....5b&link_type=abstract

Instrument Science Report ACS 00-05, 6 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Stsci

Scientific paper

ACS has 12 narrow band ramp filters with 2% bandpasses of dl/l and three ramps with medium bandpasses of 9%. Both the narrow and medium bandpass sets cover the range 3700-10700Å with a nominal 40x70 arcsec field of view. The transmission of the bandpasses have been measured as a function of wavelength and are fit with analytic functions. These characterizations are used to generate a uniform grid of 11 transmission curves over the wavelength range of each of the 15 ramp filters. This grid of transmission curves has been formatted and delivered to the STScI Synphot data base for use in the ACS Exposure Time Calculator and for instrumental absolute flux calibrations. Synphot computes the transmission curve at any wavelength in the range of a ramp filter by interpolation between the shapes of the two curves nearest in wavelength from the grid of 11.

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