2006MNRAS.365..265T

Query : 2006MNRAS.365..265T

2006MNRAS.365..265T - Mon. Not. R. Astron. Soc., 365, 265-275 (2006/January-1)

Non-Gaussianity in the Wilkinson Microwave Anisotropy Probe data using the peak-peak correlation function.

TOJEIRO R., CASTRO P.G., HEAVENS A.F. and GUPTA S.

Abstract (from CDS):

We present a search for non-Gaussianity in the Wilkinson Microwave Anisotropy Probe first-year data using the two-point correlation function of maxima and minima in the temperature map. We find evidence for non-Gaussianity on large scales, whose origin appears to be associated with unsubstracted foregrounds, but which is not entirely clear. The signal appears to be associated most strongly with cold spots, and is more pronounced in the Southern galactic hemisphere. Removal of the region of sky near the galactic plane, or filtering out large-scale modes, removes the signal. Analysis of individual frequency maps shows strongest signal in the 41-GHz Q band. A study of difference maps tests the hypothesis that the non-Gaussianity is due to residual foregrounds and noise, but shows no significant detection. We suggest that the detection is due to large-scale residual foregrounds affecting more than one frequency band, but a primordial contribution from the cosmic microwave background cannot be excluded.

Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS

Journal keyword(s): methods: data analysis - methods: numerical - methods: statistical - cosmic microwave background - early Universe

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME the Cold Spot ? 03 13 -20.5           ~ 52 0

Query : 2006MNRAS.365..265T

Basic data :
NAME the Cold Spot -- Object of Unknown Nature
Other object types: otypes_help
ICRS coord. (ep=J2000) : 		03 13 00.0 -20 30 00 [ ] E 2005MNRAS.356...29C
FK4 coord. (ep=B1950 eq=1950) : 		03 10 44.9 -20 41 11 [ ]
Gal coord. (ep=J2000) : 		209.0818 -57.0643 [ ]
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Identifiers (2) :
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NAME the Cold Spot NAME the Spot

References (52 between 1850 and 2026) (Total 52)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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