From mb144 Thu Aug 15 10:24:36 2002
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Date: Thu, 15 Aug 2002 10:22:39 -0400 (EDT)
From: Ivan Baldry <baldry@pha.jhu.edu>
Subject: Re: sdss pub 187
In-reply-to: <20020815090720.B22057@physics.nyu.edu>
To: Michael Blanton <mb144@nyu.edu>
Cc: David Hogg <david.hogg@nyu.edu>, Karl Glazebrook <kgb@pha.jhu.edu>,
 Daniel J Eisenstein <eisenste@cmb.as.arizona.edu>,
 David J Schlegel <schlegel@astro.princeton.edu>,
 James E Gunn <jeg@astro.princeton.edu>
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> On this subject, could you send me this curve? Or at least a reference
> to it, or the effective wavelength and AB-Vega conversion?

I have attached the curve which we should have referenced as 
"Hewett & Warren, private communication", and will do so in the next version.

The attachment includes an email from Paul Hewett to Steve Maddox and the 
filter curve data. I suggest you email Paul Hewett if you need more 
information. 

Integrating the filter curve through the spectrum of Vega, I obtain 

m_AB = b_J - 0.08 

in other words, the zero point of b_J is about 3900 Janskys. 

From a log(lambda)-weighted average. The effective wavelength is 
about 4650AA. 

A subtle point would be that this curve represents the response to energy 
flux (i presume) whereas transmission curves measured for CCDs are 
responses to photon flux. 

Cheers,
Ivan


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