Bias in low-multipole CMB reconstructions

Copi CJ, Huterer D, Schwarz D, Starkman GD (2011)
arXiv:1103.3505.

Download
Es wurde kein Volltext hochgeladen. Nur Publikationsnachweis!
Preprint | Veröffentlicht | Englisch
Autor
; ; ;
Abstract / Bemerkung
he large-angle, low multipole cosmic microwave background (CMB) provides a unique view of the largest angular scales in the Universe. Study of these scales is hampered by the facts that we have only one Universe to observe, only a few independent samples of the underlying statistical distribution of these modes, and an incomplete sky to observe due to the interposing Galaxy. Techniques for reconstructing a full sky from partial sky data are well known and have been applied to the large angular scales. In this work we critically study the reconstruction process and show that, in practise, the reconstruction is biased due to leakage of information from the region obscured by foregrounds to the region used for the reconstruction. We conclude that, despite being suboptimal in a technical sense, using the unobscured region without reconstructing is the most robust measure of the true CMB sky. We also show that for noise free data reconstructing using the usual optimal, unbiased estimator may be employed without smoothing thus avoiding the leakage problem. Unfortunately, directly applying this to real data with noise and residual, unmasked foregrounds yields highly biased reconstructions requiring further care to apply this method successfully to real-world CMB.
Erscheinungsjahr
Zeitschriftentitel
arXiv:1103.3505
PUB-ID

Zitieren

Copi CJ, Huterer D, Schwarz D, Starkman GD. Bias in low-multipole CMB reconstructions. arXiv:1103.3505. 2011.
Copi, C. J., Huterer, D., Schwarz, D., & Starkman, G. D. (2011). Bias in low-multipole CMB reconstructions. arXiv:1103.3505
Copi, C. J., Huterer, D., Schwarz, D., and Starkman, G. D. (2011). Bias in low-multipole CMB reconstructions. arXiv:1103.3505.
Copi, C.J., et al., 2011. Bias in low-multipole CMB reconstructions. arXiv:1103.3505.
C.J. Copi, et al., “Bias in low-multipole CMB reconstructions”, arXiv:1103.3505, 2011.
Copi, C.J., Huterer, D., Schwarz, D., Starkman, G.D.: Bias in low-multipole CMB reconstructions. arXiv:1103.3505. (2011).
Copi, Craig J., Huterer, Dragan, Schwarz, Dominik, and Starkman, Glenn D. “Bias in low-multipole CMB reconstructions”. arXiv:1103.3505 (2011).

Export

Markieren/ Markierung löschen
Markierte Publikationen

Open Data PUB

Quellen

arXiv: 1103.3505

Inspire: 893164

Suchen in

Google Scholar