Subject: high res throughput of DIS

From: Xiaohui Fan

Submitted: Wed, 25 Mar 1998 08:08:15 -0500 (EST)

Message number: 45 (previous: 44, next: 46 up: Index)

We measured the throughput of high resolution mode of DIS.
We were not doing accurate spectrophotometry, the numbers
quoted here may only be accurate to 10-20 %. The throughput peaks at
13% and 8% in blue and red sides. The red side of the high 
resolution mode is about 50% less sensitive than the blue side. 
And combining with the fact that the red chip of DIS is
more noisy, it makes getting decent spectra on red
relatively difficult. The throughput is also  
considerably lower than that of low resolution mode
(which peaks at 17% and 15% in blue and red),
and somewhat lower than that of med mode (which peaks
at 16% and 8%).

==========================================================
Here are the numbers:
===========================================================

Blue :

 central wavelength=4950, coverage ~4535-5365

 4604 0.094
 4735 0.118
 4825 0.125
 4914 0.129
 5067 0.129
 5145 0.121
 5263 0.097 
 
 
Red :

 central wavelength=6325, coverage ~5800-6850

 5840 0.043
 5980 0.046
 6140 0.064
 6290 0.077
 6436 0.064
 6530 0.063
 6670 0.069
 6790 0.063
-- 
Xiaohui Fan
Princeton University Observatory
Peyton Hall
Princeton, NJ 08544

email : fan@astro.princeton.edu
tel   : (609) 258-5153 (O)
        (609) 716-0480 (H)

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