Flux Calibration of the ACS CCD Cameras II. Encircled Energy Correction

Details Flux Calibration of the ACS CCD Cameras II. Encircled Energy Correction Flux Calibration of the ACS CCD Cameras II. Encircled Energy Correction

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acs..rept....2b&link_type=abstract

Instrument Science Report ACS 2011-02, 10 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Acs

Scientific paper

In order to convert a point source flux calibration into a surface brightness calibration, the total response to a point source in an infinite aperture is required. In practice, infinite is defined as an aperture with a radius of 5.5". However, aperture photometry for such a large radius is exquisitely sensitive to the measured sky background level. In order to minimize uncertainties, corrections from one arcsec to infinity (5.5") are derived from averages over as many heavily exposed, isolated stellar images as possible. Calibrations, such as the change in sensitivity with time or flux calibrations from specific standard stars, utilize the low noise photometry for one arcsec radius; and the average correction to infinite aperture is used only as required. This ISR deals with the ACS encircled energy for one arcsec relative to infinity for the HRC and WFC.

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