High-resolution imaging in the visible from the ground without adaptive optics: new techniques and results

Details High-resolution imaging in the visible from the ground without adaptive optics: new techniques and results High-resolution imaging in the visible from the ground without adaptive optics: new techniques and results

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5492..128m&link_type=abstract

Ground-based Instrumentation for Astronomy. Edited by Alan F. M. Moorwood and Iye Masanori. Proceedings of the SPIE, Volume 5492

Astronomy and Astrophysics

Astronomy

8

Scientific paper

Many astronomical imaging studies, such as those of weak gravitational lensing, call for better angular resolution than is normally possible from the ground over wide fields of view . For many of these studies astronomers need images which show a consistent point spread function across the field even if this comes at the expense of the ultimate in angular resolution at the centre of the field. Adaptive Optics does not show any prospect of being able to achieve fields of view as large as are needed at visible wavelengths and therefore a new technique of delivering high resolution images from the ground must be developed. Electron multiplying CCDs are available that allow images to be taken at high speed without the usual penalty of read noise. We have developed a new technique called Lucky Imaging which achieves high resolution by selecting the better images from a sequence of images, then shifting and adding each to give a much higher resolution output image. Resolutions in the range 0.1-0.2 arc seconds can be obtained routinely under relatively good conditions on a 2.5 metre telescope working in I band (850 nanometres) and using as much as 30% of the images taken. Even under poorer conditions we find that image selection allows the final resolution to be better than the traditional seeing value by a factor of as much as three. This paper describes the technique and some of the results obtained using this method.

Affiliated with

Also associated with

No associations

Rating

High-resolution imaging in the visible from the ground without adaptive optics: new techniques and results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-resolution imaging in the visible from the ground without adaptive optics: new techniques and results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-resolution imaging in the visible from the ground without adaptive optics: new techniques and results will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1821551