HK-band illumination correction. Constant (0th) term fitted within each slitlet, some slitlets at the left edge of the array would be better fitted with higher polynomial. First column should be located few pixels to the left. Colors from 0.85 to 1.1
Before
After
1.51 μm
1.58 μm
1.67 μm
1.77 μm
2.00 μm
2.07 μm
2.20 μm
2.30 μm
2.42 μm
H-band illumination correction. Constant (0th) term fitted within each slitlet - colors from 0.8 - 1.1
Before
After
1.45 μm
1.47 μm
1.49 μm
1.51 μm
1.59 μm
1.61 μm
1.62 μm
1.67 μm
1.69 μm
1.71 μm
1.74 μm
1.77 μm
1.79 μm
1.80 μm
1.81 μm
J-band illumination correction. Constant (0th) term fitted within each slitlet - colors from 0.7 - 1.1. One of slitlets (as defined by a multiple of 64) is suffering from relatively strong odd-even effect. The later set has been reduced with two different darks for comparison. Difference can be significant, if a low minimum flux is used. Downside of using a high minimum flux in J is there are no strong OH lines beyond 1.3 μm... IN the second set, three slitlets on the left show clear emission (ghost? persistence effect?)
Before, DIT=900 s
After, DIT=900 s
Before, DIT=300 s
After, DIT=300 s Dark Mar 22
After, DIT=300s Dark Apr 02
1.10 μm
1.14 μm
1.16 μm
1.21 μm
1.23 μm
1.27 μm
1.29 μm
1.31 μm
1.32 μm
1.34 μm
1.40 μm
K-band illumination correction. Constant (0th) term fitted within each slitlet - colors from 0.85 - 1.1.
