Image sharpening observations of active galactic nuclei

Bibcode
1987ESASP.273..221C
Campos-Aguilar, A.; Perez-Fournon, I.; Carranza, J. M.
Bibliographical reference

In ESA, ESA Workshop on Optical Interferometry in Space p 221-225 (SEE N88-10613 01-74)

Advertised on:
8
1987
Number of authors
3
IAC number of authors
0
Citations
1
Refereed citations
1
Description
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.
Type
Non-refereed
Active galactic nuclei
Active galaxies

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