Calibration of HST wide field camera for quantitative analysis of faint galaxy images

Details Calibration of HST wide field camera for quantitative analysis of faint galaxy images Calibration of HST wide field camera for quantitative analysis of faint galaxy images

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.2362r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 108, no. 6, p. 2362-2372

Astronomy and Astrophysics

Astronomy

17

Astronomical Photometry, Calibrating, Cameras, Faint Objects, Hubble Space Telescope, Image Enhancement, Background Noise, Bias, Computer Programs, Error Analysis, Sky Brightness, Sky Surveys (Astronomy)

Scientific paper

We present the methods adopted to optimize the calibration of images obtained with the Hubble Space Telescope (HST) Wide Field Camera (WFC) (1991-1993). Our main goal is to improve quantitative measurement of faint images, with special emphasis on the faint (I approximately 20-24 mag) stars and galaxies observed as a part of the Medium-Deep Survey. Several modifications to the standard calibration procedures have been introduced, including improved bias and dark images, and a new super-sky flatfield obtained by combining a large number of relatively object-free Medium-Deep Survey exposures of random fields. The super-sky flat has a pixel-to-pixel rms error of about 2.0% in F555W and of 2.4% in F785LP; large-scale variations are smaller than 1% rms. Overall, our modifications improve the quality of faint images with respect to the standard calibration by about a factor of five in photometric accuracy and about 0.3 mag in sensitivity, corresponding to about a factor of two in observing time. The relevant calibration images have been made available to the scientific community.

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