Pixel covariance matrix

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preshanth jagannathan
Posts: 8
Joined: September 15 2006
Affiliation: University of Calgary

Pixel covariance matrix

Post by preshanth jagannathan » June 22 2007

I would like to know where and how can i obtain the unmasked pixel space covariance matrix to work on the polarization maps. Is it directly available or should i obtain it from the harmonic space matrix ?

Thank you

Hans Kristian Eriksen
Posts: 58
Joined: September 25 2004
Affiliation: ITA, University of Oslo
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Re: Pixel covariance matrix

Post by Hans Kristian Eriksen » June 23 2007

preshanth jagannathan wrote:I would like to know where and how can i obtain the unmasked pixel space covariance matrix to work on the polarization maps. Is it directly available or should i obtain it from the harmonic space matrix ?
I'm assuming you're talking about the low-resolution WMAP3 polarization data here? If so, both the masked and unmasked covariance matrices are available on Lambda:

Full-sky:
http://lambda.gsfc.nasa.gov/product/map ... 4_info.cfm

Cut-sky:
http://lambda.gsfc.nasa.gov/product/map ... g_info.cfm

Make sure that you use the correct maps corresponding to the right covariance matrix in each case -- the cut-sky matrices have been corrected for template noise, and should not be used together with other sky maps.

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