Impact of the 1/f Noise and the Asymmetric Beam on Non-Gaussianity Searches with Planck
Abstract
We study the impact of correlated instrumental noise and non-circular antenna beam patterns on primordial non-Gaussianity analysis. The two systematic effects are reproduced in the case of the Planck mission, using Planck-like realistic simulations. The non-Gaussian analysis is conducted with different approaches. First we adopt a blind approach, using the Spherical Mexican Hat Wavelet and the Minkowski functionals, and then an f NL estimator. We look respectively for false primordial non-Gaussian detections and for bias or variance increase in the estimated f NL value. Even if some slight effects are present, we cannot observe any significant impact of the 1/f noise and the asymmetric beam on non-Gaussianity searches in the context of the Planck mission.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2009
- DOI:
- 10.1088/0004-637X/706/2/1226
- arXiv:
- arXiv:0907.4650
- Bibcode:
- 2009ApJ...706.1226D
- Keywords:
-
- cosmic microwave background;
- cosmology: observations;
- early universe;
- methods: data analysis;
- methods: statistical;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- E-Print:
- 13 pages, 19 figures, published in ApJ