Keck Adaptive Optics

Galaxies are difficult targets for adaptive optics because the extension of the nuclei and the reduced contrast of the nucleus with respect to the disk and/or bulge means that artefacts can easily appear. The sharper and more contrasted the nucleus the better the resulting correction. NGC 7469, which has an unresolved nucleus in HST images provides a good example of such an object.

The close environment of the Seyfert 1 galaxy NGC 7469.

These images of NGC 7499 were obtained by locking the loop on the nucleus of the galaxy itself, a magnitude 13.5.