Number of z bins in lensing power spectrum using iCosmo

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Sarah Bridle
Posts: 144
Joined: September 24 2004
Affiliation: University College London (UCL)
Contact:

Number of z bins in lensing power spectrum using iCosmo

Post by Sarah Bridle » October 08 2008

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

Thomas Kitching
Posts: 9
Joined: September 14 2005
Affiliation: University of Edinburgh
Contact:

Number of z bins in lensing power spectrum using iCosmo

Post by Thomas Kitching » October 08 2008

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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