English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The Planck satellite will observe the full sky at nine frequencies from 30 to857 GHz. The goal of this paper is to examine the effects of four realisticinstrument systematics in the 30 GHz frequency maps: non-axially-symmetricbeams, sample integration, sorption cooler noise, and pointing errors. Wesimulated one year long observations of four 30 GHz detectors. The simulatedtimestreams contained CMB, foreground components (both galactic andextra-galactic), instrument noise (correlated and white), and the fourinstrument systematic effects. We made maps from the timelines and examined themagnitudes of the systematics effects in the maps and their angular powerspectra. We also compared the maps of different mapmaking codes to see how theyperformed. We used five mapmaking codes (two destripers and three optimalcodes). None of our mapmaking codes makes an attempt to deconvolve the beamfrom its output map. Therefore all our maps had similar smoothing due to beamsand sample integration. Temperature to polarization cross-coupling due to beammismatch causes a detectable bias in the TE spectrum of the CMB map. Theeffects of cooler noise and pointing errors did not appear to be major concernsfor the 30 GHz channel. The only essential difference found so far betweenmapmaking codes that affects accuracy (in terms of residual RMS) is baselinelength. All optimal codes give essentially indistinguishable results. Adestriper gives the same result as the optimal codes when the baseline is setshort enough. For longer baselines destripers require less computing resourcesbut deliver a noisier map.

Making Maps from Planck LFI 30GHz Data with Asymmetric Beams and Cooler Noise