Scientific Computing Seminar

Date:

Wednesday, March 16, 2005

Time:

1:00pm-2:00pm

Location:

50B-4205

Seminar Speaker:

Mark Ashdown
Astrophysics Group
Cavendish Laboratory
University of Cambridge
http://www.mrao.cam.ac.uk/~maja1/

Title:

Destriping: a fast, approximate map-making method for Planck

Abstract:

The Planck mission will measure the CMB anisotropies over the whole sky with unprecedented sensitivity and angular resolution. The volume of data makes its analysis a computationally challenging feat, even for the basic operation of making maps from the time-ordered series of observations. A fast map-making method is essential if large numbers of Monte Carlo simulations are to be used to assess the impact of random and systematic errors on the scientific results. Destriping is a fast, approximate method of map-making attuned to Planck's observation strategy. I will show that destriping can be used to derive a simple model of the uncertainties in the resulting maps that will be useful in any further analyses of the data. I will describe a parallel implementation of the algorithm and show results from applying it to simulated Planck data. Last, I will show that destriping can be extended to allow deconvolution of asymmetric beams.

Sponsor of Seminar:

Gayoung Chon

Scientific Computing

Contact Esmond G. Ng EGNg@lbl.gov