puzzlin Chandra proposal thread

From: Saku Vrtilek <saku_at_email.domain.hidden>
Date: Wed, 09 Mar 2005 15:47:29 -0500

Looking at the Chandra proposal thread:

Calculate Exposure Time for a Single Line Detection using ACIS-S/HETG

which is at 


At the start of the page it says:

``We would like to determine the exposure time needed to make a 5 sigma 
detection of hydrogen-like Ne at 0.9-1.3 keV with a flux of 2.0e-5 photons 
cm^-2 s^-1.''

They start with a guess of 35ks.  After going through several steps 
(a bit more than half way down the page) they say:

``The lowest flux that could be detected is therefore 2.6584e-05 photons cm^-2 
s^-1. The chosen 35ks exposure time is adequate to detect the line of 

Is this a misprint?

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Received on Wed Mar 09 2005 - 16:00:54 EST

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