Issue |
A&A
Volume 486, Number 2, August I 2008
|
|
---|---|---|
Page(s) | 383 - 391 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:200809880 | |
Published online | 27 May 2008 |
Constraints on the non-linear coupling parameter fnl with Archeops data
1
Instituto de Física de Cantabria, CSIC-Universidad de Cantabria, Avda. de los Castros s/n, 39005 Santander, Spain e-mail: curto@ifca.unican.es
2
Dpto. de Física Moderna, Universidad de Cantabria, Avda. los Castros s/n, 39005 Santander, Spain
3
LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, 53 Av. des Martyrs, 38026 Grenoble, France
4
Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, 0315 Oslo, Norway
5
Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberfoce Road, Cambridge, CB3 0WA, UK
6
Dipartimento di Fisica G. Galilei, Università di Padova and INFN, Sezione di Padova, via Marzolo 8, 35131 Padova, Italy
Received:
1
April
2008
Accepted:
26
April
2008
Aims. We present a Gaussianity analysis of the Archeops
Cosmic Microwave Background (CMB) temperature anisotropy data maps at high
resolution to constrain the non-linear coupling parameter
fnl characterising well motivated non-Gaussian CMB models.
We used the data collected by the most sensitive Archeops
bolometer at 143 GHz.
The instrumental noise was carefully
characterised for this bolometer, and for another Archeops
bolometer at 143 GHz used for comparison. Angular scales from
27 arcmin to 1.8 degrees and a large fraction of the sky, 21%,
covering both hemispheres (avoiding pixels with Galactic latitude
degrees) were considered.
Methods. The three Minkowski functionals on the sphere evaluated at different
thresholds were used to construct a statistics for both
the Gaussian and the non-Gaussian CMB models. The
Archeops maps were produced with the Mirage optimal map-making
procedure from processed time ordered data. The analysis is
based on simulations of signal (Gaussian and non-Gaussian
fnl CMB models) and noise which were processed in the time
domain using the Archeops pipeline and projected on the sky
using the Mirage optimal map-making procedure.
Results. The Archeops data were found to be compatible with Gaussianity
after removal of highly noisy pixels at high resolution. The
non-linear coupling parameter was constrained to at 68% CL and
at
95% CL, for realistic non-Gaussian CMB simulations.
Key words: cosmology: observations / methods: data analysis / cosmology: cosmic microwave background
© ESO, 2008
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