Image sharpening observations of active galactic nuclei

Campos-Aguilar, A.; Perez-Fournon, I.; Carranza, J. M.
Referencia bibliográfica

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

Fecha de publicación:
8
1987
Número de autores
3
Número de autores del IAC
0
Número de citas
1
Número de citas referidas
1
Descripción
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.