Other
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.273..221c&link_type=abstract
In ESA, ESA Workshop on Optical Interferometry in Space p 221-225 (SEE N88-10613 01-74)
Other
1
Active Galactic Nuclei, Imaging Techniques, Photonics, Active Galaxies, Algorithms, Angular Resolution, Cross Correlation
Scientific paper
It is shown that recentering, selecting, and adding up sharp short-exposure images obtained with a photon-counting detector working in time-resolved mode can yield a gain in angular resolution better than a factor of 2. A cross-correlation selection algorithm, appropriate for faint and extended objects, is developed and compared with other image sharpness criteria. The limiting magnitude of the technique is 15 under normal conditions (seeing = 1 arcsec). Selecting the moments of best seeing during the night improves this limit by two or three magnitudes. Thus, a large number of extragalactic objects can be easily imaged with a resolution of a few tenths of an arcsec. Results for a sample of bright active galaxies are presented.
Campos-Aguilar Ana
Carranza J. M.
Perez-Fournon Ismael
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