From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Sat Nov 02 2002 - 16:45:35 PST
I have done a little experiment based on the previously described code,
sxdf.pro wherein I have studied the improvement made if we can add
images with 0.9" seeing (or better) tonight at Subaru. I tested adding
5 exposures of 240s each to each of the five fields. Then I tested
adding 10 such exposures. From this I have reached the following
conclusion.
1) All fields will reach full depth if they each an additional have 5x240s
2) Fields 5, 2, and 3 are helped the most by 5 x 240s
3) Field 1 is also helped significantly, and since
4) It will be the most expensive to reach full depth on Field 4
From these conclusions I have developed the following recommendations,
which I present in a tiered fashion since I don't know how much i' time
there will be tonight.
1) Obtain 5 x 240s on field 1 if FWHM < 0.9" (because this has phot-z's)
2) Obtain 5 x 240s on field 2 if FWHM < 0.9"
3) Obtain 5 x 240s on field 5 if FWHM < 0.9"
4) Obtain 5 x 240s on field 3 if FWHM < 0.9"
5) Obtain additional 2 x 240s on field 1 if FWHM < 0.9"
As I was writting this, news arrived from Naoki that they are switching
to SuprimCam on Nov 4 and Nov 5. Assuming good conditions, one can see
from the above that we really only need a few more hours to reach
full depth in i'. On the other hand, the for forecast for tonight calls
for cirrus.
- Greg
Results of adding 5 and 10 x 240s with FWHM = 0.9" to the news for
each SXDF field.
New | Sum all for each field | Sum <= 0.9" for each field
Images | 1 2 3 4 5 | 1 2 3 4 5
---------|------------------------------|-----------------------------
0 | 0.75 0.79 0.82 0.71 0.92 | 0.61 0.69 0.64 0.47 0.75
5@240s | 1.07 1.10 1.13 1.03 1.23 | 0.92 1.00 0.95 0.77 1.05
10@240s | 1.39 1.42 1.45 1.34 1.56 | 1.23 1.31 1.26 1.09 1.36
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