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| Paper: |
The shift-and-stare technique and a large area CCD mosaic |
| Volume: |
8, CCDs in Astronomy |
| Page: |
1 |
| Authors: |
Tyson, J. A. |
| Abstract: |
New techniques for ultradeep imaging with CCDs are described. These allow detection and photometry at a level of 0.01 percent of sky background. The telescope is moved randomly between exposures, producing 30-100 disreistered images. Automated image processing on a workstation yields the final image, corrected for CCD imperfections and sky+optics systematics. Faint galaxies and stars of 30th magnitude are detected in 10 hours integration on a 4 meter telescope, corresponding to 0.02 photons/sec per pixel. Detection levels of 2 x 10 to the -5th/sq m per nm per sec per pixel photons to the -5th photons/sq m per nm per sec per pixel have been reached. This 'shift-and-stare' technique will be used with a large area CCD mosaic camera now being assembled. Deep images of fields up to 40 arcmin (5000 x 5000 pixels) will be obtained. |
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