Contrast limit . Image scale The image scale and area are summarized in Chapter 5 and in Figure 4.5. Important things to note are the small overall field of view of the SIS and the gaps between the CCDs. For an extended source or a cluster of point sources, these features may become problematic. However, this would be considered a non-standard request.
Fast mode works by continuously reading out one of the four CCDs.
The highest possible time resolution is 15.625 msec, with the following caveats. As the PSF is wider than 168 lines, some photons will be detected in the wrong time bin. This places a severe limit on the highest flux level that can be used without saturation for bursting or flaring sources. All the restrictions on imaging modes also apply. The resolution of SIS-1 without RDD, according to the above formulae, at 6 different epochs, are plotted in Figure 8.5b.