Cosmic ray contribution in the WMAP of the cosmic microwave background

Wibig, T.; Wolfendale, A. W.

doi:10.1093/mnras/stv039

Cited by 3 publications

(2 citation statements)

References 10 publications

(9 reference statements)

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Section: Introductionmentioning

confidence: 99%

“…This correlation coefficient is computed outside a galactic mask. A cross-correlation analysis of CMB data with external data sets was already used in the literature in a variety of ways, for example, in Afshordi, Loh & Strauss (2004); Coles et al (2004); ; Bernardi et al (2005); Naselsky et al (2005); Alvarez et al (2006); Rassat et al (2007); Land & Slosar (2007); Sarkar, Datta & Bharadwaj (2009); Hernandez-Monteagudo (2010); Lopez-Corredoira, Labini & Betancort-Rijo (2010); Naselsky et al (2010); Sawangwit et al (2010); Ilic et al (2011); Taburet et al (2011); Hansen et al (2012); Wibig & Wolfendale (2015).…”

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confidence: 99%

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Cross-correlation analysis of CMB with foregrounds for residuals

Aluri

Rath

2016

Mon. Not. R. Astron. Soc.

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In this paper, we try to probe whether a clean CMB map obtained from the raw satellite data using a cleaning procedure is sufficiently clean. Specifically we study if there are any foreground residuals still present in the cleaned data using a cross-correlation statistic. Residual contamination is expected to be present, primarily, in the galactic plane due to the high emission from our own galaxy. A foreground mask is applied conventionally to avoid biases in the estimated quantities of interest due to foreground leakage. Here, we map foreground residuals, if present, in the unmasked region i.e., outside a CMB analysis mask. Further locally extended foreground-contaminated regions, found eventually, are studied to understand them better. The few contaminated regions thus identified may be used to slightly extend the available masks to make them more stringent.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Cross-correlation analysis of CMB with foregrounds for residuals

Aluri

Rath

2016

Mon. Not. R. Astron. Soc.

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Cosmic ray contributions to the WMAP polarization data on the cosmic microwave background

Wibig

Wolfendale

2016

Int. J. Mod. Phys. D

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We have updated our analysis of the 9-year WMAP data using the collection of polarization maps looking for the presence of additional evidence for a finite ‘cosmic ray (CR) foreground’ for the cosmic microwave background (CMB). We have given special attention to high Galactic latitudes, where the recent BICEP2 findings were reported although very recent Planck data claims that dust is prevalent, thus nullifying the BICEP2 results. The method of examining the correlation with the observed gamma ray flux proposed in our earlier papers and applied to the polarization data shows that the foreground related to CRs is still observed even at high Galactic latitudes and conclusions about gravitational waves are not yet secure. Theory has it that there is important information about inflationary gravitational waves in the fine structure of the CMB polarization properties (polarization vector and angle) and it is necessary to examine further the conclusions that can be gained from studies of the CMB maps, in view of the disturbing foreground effects.

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Foreground contribution to the inferred cosmological parameters from Planck

Vincent

Wibig

Wolfendale

2018

Int. J. Mod. Phys. D

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Previous analyses of cosmic microwave background (CMB) measurements [T. Wibig and A. W. Wolfendale, Mon. Not. R. Astron. Soc. 360 (2005) 236, arXiv:astro-ph/0409397; Mon. Not. R. Astron. Soc. 448 (2015) 1030, arXiv:1507.0677.] have revealed contamination by areas of high cosmic ray activity in the Milky Way. Here, we update studies, looking at the most recent Planck release of residual maps. We search for possible effects of foreground contamination in the reconstruction of the [Formula: see text]CDM cosmological parameters. We focus on the Hubble parameter [Formula: see text] and the optical depth to reionization [Formula: see text], both of which exhibit discrepancies between CMB-inferred values and low-redshift measurements (“the delta [Formula: see text] problem”). Using the publicly available “component separated” Planck temperature maps, we single out three distinct regions: the “loops”, “chimneys” and “low CR” regions, which disproportionately contributed to CR contamination of WMAP data. We find that two of the four maps are strongly affected by removal of anomalously high or low CR activity regions. However, the Commander method, used to produce the angular power spectrum at low ([Formula: see text]) multipoles in cosmological analyses, appears robust under these changes. Finally, we use the inferred Hubble parameter [Formula: see text] as a proxy to look for general directional dependence of the CMB power spectrum, finding a small but robust dependence on the Galactic longitude. Although there is some evidence for a continuing CR contamination, it is insufficient to provide an answer to the delta [Formula: see text] problem, or to the optical depth problem, though dependence of the derived [Formula: see text] on direction seems significant. The geometrical pattern — striations along constant longitudes — suggests CR contamination as distinct from a truly cosmological effect.

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Cosmic ray contribution in the WMAP of the cosmic microwave background

Cited by 3 publications

References 10 publications

Cross-correlation analysis of CMB with foregrounds for residuals

Cross-correlation analysis of CMB with foregrounds for residuals

Cosmic ray contributions to the WMAP polarization data on the cosmic microwave background

Foreground contribution to the inferred cosmological parameters from Planck

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