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2005MNRAS.360..236W - Mon. Not. R. Astron. Soc., 360, 236-252 (2005/June-2)
Foreground contributions to the cosmic microwave background.
WIBIG T. and WOLFENDALE A.W.
Abstract (from CDS):
In an effort to find the origin of these Galactic-style effects we have examined evidence from Galactic gamma-rays, specifically from the EGRET instrument. We are mindful that the CMB maps examined have already been `cleaned' (for CR and other effects) in a rather complex way, but, in our view, the cleaning has left some potentially serious `contaminations'. A correlation is found between gamma-ray intensities and the CMB and other CR indicators. For example, regions of the Galaxy having (line-of-sight) steep CR energy spectra have low mean CMB temperatures, and the important Loop I edge region, where the CR intensity is high, has a high mean temperature.
Most of the large-scale Galactic asymmetries (e.g. north-south difference and quadrant variations) have analogues in CR asymmetries and also in some other Galactic properties, such as the column density of gas. Thus, it is possible to hypothesize about direct CR-induced contributions, although it may be that CRs are simply the indicators of Galactic `conditions' which are influencing the residual CMB fluctuations.
Irrespective of the actual cause of the correlations we have endeavoured to extrapolate to the situation where the residual foreground is minimized. The effect on the usually derived cosmological properties is briefly examined. The least that can be said is that the `error' in some of these properties has been underestimated.
Abstract Copyright: 2005 RAS
Journal keyword(s): cosmic rays - cosmic microwave background
Simbad objects: 5
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