Analysis of WMAP 7-year Temperature Data: Astrophysics of the Galactic Haze

Abstract

We analyse WMAP 7-year temperature data, jointly modeling the cosmic microwave background (CMB) and Galactic foreground emission. We use the Commander code based on Gibbs sampling. Thus, from the WMAP7 data, we derive simultaneously the CMB and Galactic components on scales larger than 1deg with sensitivity improved relative to previous work. We conduct a detailed study of the low-frequency foreground with particular focus on the "microwave haze" emission around the Galactic center. We demonstrate improved performance in quantifying the diffuse galactic emission when Haslam 408MHz data are included together with WMAP7, and the spinning and thermal dust emission is modeled jointly. We also address the question of whether the hypothetical galactic haze can be explained by a spatial variation of the synchrotron spectral index. The excess of emission around the Galactic center appears stable with respect to variations of the foreground model that we study. Our results demonstrate that the new galactic foreground component - the microwave haze - is indeed present.

16 pages, 16 figures, Published on ApJ

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Cited by in corpus (11)

• The Spectrum and Morphology of the Fermi Bubbles
• Planck 2013 results. XII. Component separation
• Tests and problems of the standard model in Cosmology
• Planck Intermediate Results. IX. Detection of the Galactic haze with Planck
• First measurement of the bulk flow of nearby galaxies using the cosmic microwave background
• Planck intermediate results. XII: Diffuse Galactic components in the Gould Belt System
• Identifying the Radio Bubble Nature of the Microwave Haze
• Dark matter implications of the WMAP-Planck Haze
• QUIJOTE scientific results -- VI. The Haze as seen by QUIJOTE
• Testing the dark matter origin of the WMAP-Planck Haze with radio observations of Spiral Galaxies
• Diffuse continuum emission and large extended sources at MeV energies