Subject: flat-field dis slit viewer

From: fan@ias.edu

Submitted: Fri, 22 Dec 2000 12:44:53 -0500 (EST)

Message number: 83 (previous: 82, next: 84 up: Index)

Hello everyone,

 Last night I tried to do some simple flat-fielding for the
DIS slit-viewer and wanted to see how faint we can acquire.
After substracting a rough bias level, and flat-field it with
a supersky from a previous night, a 3 min slit viewer exposure
goes quite a bit deeper than the SDSS finding chart I have.
So the limiting magnitude should be something like 23.5 mag,
and this is under 1.5" seeing. 

 We have been doing spectroscopy of very faint sources recently,
and I found the flat-fielding makes object acquisition a lot easier.

 Cheers,
Xiaohui

-- 
Xiaohui Fan
School of Natural Sciences
Institute for Advanced Study
Princeton, NJ 08540

email : fan@sns.ias.edu
tel   : (609) 734-8023 (O)
        (609) 279-2981 (H)


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