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This ensures that there is no bias introduced by selectively removing features in the scans. After this final stage of editing, the baseline fitting must be repeated for the full remaining data set. The MEM process will now be able to search for a more accurate solution and will produce a new set of more accurate baselines. The coverages of a given declination can now be stacked together and the process repeated until all artefacts of this type are removed. This process is carried out for each of the Tenerife data sets discussed in this thesis but will not be mentioned again.

2 Stacking the data The data set consists of 1◦ bins in right ascension covering a range of declinations and taken over a large number of days (the best scans have nearly 200 days of data). To reduce the amount of data it is necessary to stack all the data for each point that were taken at different days together. This is done after baseline subtraction to avoid addition of atmospheric effects. By taking a weighted mean over the ns scans (where ns is the number of days) the final data scan is obtained.

Since the publication of Bersanelli et al (1996) substantial improvements have been made to the telescope and the latest specifications (G. Efstathiou, private communication) will be used in the simulations performed in this thesis. The main improvements include a change in frequencies and a substantial improvement in noise sensitivities for the lower frequency channels and an additional 100 GHz channel which can be 34 CHAPTER 3. 1: Summary of the Planck Surveyor satellite frequency channels (G.

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Appl of Novel Analysis Tech to Cosmic Microwave Bkd Astronomy [thesis] by A. Jones

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