Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1040c&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Sept. 1991, p. 1040-1048.
Astronomy and Astrophysics
Astronomy
40
Image Reconstruction, Infrared Astronomy, Infrared Imagery, Seeing (Astronomy), Telescopes, Atmospheric Attenuation, Near Infrared Radiation, Signal To Noise Ratios, Transfer Functions
Scientific paper
The image quality obtainable with shift-and-add (SAA) imaging for the recovery of diffraction-limited information is quantitatively investigated using data simulating an 8-m aperture at a site with near-IR seeing conditions as found on Mauna Kea. This is compared to the image quality obtainable from image centroiding and wavefront tip-tilt correction. For good seeing conditions, image centroiding and SAA, which tracks the image peak, show similar performance containing about 30 percent of the image power in a diffraction-limited component. However, as the seeing degrades, SAA consistently yields improved resolution maintaining significantly greater diffraction-limited information. This enhances the detection threshold by about 2 magnitudes over the seeing-limited case for the seeing range studied. By comparison, the gain due to image centroiding decreases to less than 1 magnitude at the same poor seeing limit.
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