Introduction to Image Reduction
Introduction to Image Reduction
Introduction to Image Reduction
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Motivation & background Instrumental Signature Removal Combining multiple images Pho<strong>to</strong>metric calibration<br />
Ground-based vs space-based<br />
Ground Space<br />
Background high ∗<br />
low<br />
CR rate low high<br />
Charge transfer efficiency good degrades with time †<br />
Pho<strong>to</strong>metric stability variable stable<br />
Angular resolution limited by atmospheric “seeing” can be very good ‡<br />
Wavelength limitations some none<br />
Cost low high<br />
Typical reduction mode do-it-yourself (software provided) more au<strong>to</strong>mated<br />
∗ most galaxies are much fainter than “blank” sky!<br />
† result: streaking as shown at right<br />
‡ depends greatly on observa<strong>to</strong>ry parameters
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