The relative throughput of MegaPrime versus CFH12K in its current environment,
with the current BVRIz' filters.
No U on CFH12K, and a big overlap between I and z'.
Same thing (without 12K and MegaCam QE), this time with the SDSS filter
set.
u' is poor in shape compared to the other filters.
A possible new u' filter for MegaPrime. The lower and upper cuts can be easily changed without modifying the overall transmission characteristics of the filter.
NAME CENTER(nm) FWHM(nm) TMAX(%) DIMENSIONS(mm) TRACE -------------------------------------------------------------- u' 350 600 0.778 76x76x3 N/A g' 480 140 0.919 76x76x3 N/A r' 625 140 0.976 76x76x3 N/A i' 770 150 0.987 76x76x3 N/A z' 910 120 0.980 76x76x3 N/A
Filters | effective wavelength | full width at half maximum | Wavelength range | limiting magnitude for S/N 5:1 |
u' | 3540 | 570 | 3250-3800 | 22.3 |
g' | 4770 | 1370 | 4085-5455 | 23.3 |
r' | 6230 | 1370 | 5550-6915 | 23.1 |
i' | 7630 | 1530 | 6850-8400 | 22.5 |
z' | 9130 | 950 | 8650-9600 | 20.8 |
Table 1: filter characteristics of the SDSS.