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Number of z bins in lensing power spectrum using iCosmo
 
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Sarah Bridle



Joined: 24 Sep 2004
Posts: 149
Affiliation: University College London (UCL)

PostPosted: October 08 2008  Reply with quote

Hi,
Congratulations on the super-useful iCosmo! It has already come in handy!

I was confused on one point though:

I checked the box "Cosmology Observables: Lensing Power Spectrum"
I selected "Lensing" for "Fisher Matrix 1"
Under "Experiments" I chose "DUNE" from "Fisher 1"
I changed "Number of redshift bins" to "5" to compare with some other results.
I click on the "Cosmology Errors" tab and I get:
"Survey 1: DUNE : Area = 20000.00 sq. deg., z error = 0.030(1+z), Med Redshift = 1.00, Gals per sq. arcmin = 40.00, No. z-bins = 10.00,"
whereas I had asked for 5 z-bins.

Am I doing something wrong?

Thanks so much for making all this lovely stuff public!
Sarah
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Thomas Kitching



Joined: 14 Sep 2005
Posts: 9
Affiliation: University of Edinburgh

PostPosted: October 08 2008  Reply with quote

Hi Sarah,

Thanks, glad that it is already coming in handy!

This happened because you can have a different survey for the lensing power spectrum and the lensing Fisher matrix.

The survey you were given to fill in was for the lensing power spectrum since you chose "Make Custom" for this particular product in step 2.

To get a custom survey for the lensing Fisher matrix select "Make Custom" on step 2. You can then chose the number of z-bins.
If you have also chosen "Make Custom" for the lensing power spectrum on step 2 then you will now be presented with two surveys to fill in.

Cheers
Tom
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