Since 1970 surface brightness profiles of disc galaxies were classified as Type-I, single falling exponentials, or Type-II, broken exponentials with steeper...
AOLI: Adaptive Optics Lucky Imager: diffraction limited imaging in the visible on large ground-based telescopes
The highest resolution images ever taken in the visible were obtained by combining Lucky Imaging and low order adaptive optics. This paper describes a new...
AOLI: near-diffraction limited imaging in the visible on large ground-based telescopes
The combination of Lucky Imaging with a low order adaptive optics system was demonstrated very successfully on the Palomar 5m telescope nearly 10 years ago. It...
Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrograph
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) will observe approximately 100,000 giant stars in the Milky Way with a dedicated fiber-fed...
APE: a breadboard to evaluate new phasing technologies for a future European Giant Optical Telescope
The point spread function of a segmented aperture is seriously affected by the misalignment of the segments. Stringent requirements apply to position sensors...