Magnetic substructure in the northern Fermi Bubble revealed by polarized WMAP emission

Abstract

We report a correspondence between giant, polarized microwave structures emerging north from the Galactic plane near the Galactic center and a number of GeV gamma-ray features, including the eastern edge of the recently-discovered northern Fermi Bubble. The polarized microwave features also correspond to structures seen in the all-sky 408 MHz total intensity data, including the Galactic center spur. The magnetic field structure revealed by the polarization data at 23 GHz suggests that neither the emission coincident with the Bubble edge nor the Galactic center spur are likely to be features of the local ISM. On the basis of the observed morphological correspondences, similar inferred spectra, and the similar energetics of all sources, we suggest a direct connection between the Galactic center spur and the northern Fermi Bubble.

Accepted for publication in The Astrophysical Journal Letters after minor changes

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Cited by in corpus (21)

• The Spectrum and Morphology of the Fermi Bubbles
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• A Unified Model of the Fermi Bubbles, Microwave Haze, and Polarized Radio Lobes: Reverse Shocks in the Galactic Center's Giant Outflows
• Polarised radio filaments outside the Galactic plane
• Non-Thermal Insights on Mass and Energy Flows Through the Galactic Centre and into the Fermi Bubbles
• The Fermi Bubbles as Starburst Wind Termination Shocks
• The Fermi Bubbles Revisited
• Multi-wavelength Emission from the Fermi Bubble III. Stochastic (Fermi) Re-Acceleration of Relativistic Electrons Emitted by SNRs
• Steady-State Hadronic Gamma-Ray Emission from 100-Myr-Old Fermi Bubbles
• Fermi bubble $\gamma$-rays as a result of diffusive injection of Galactic cosmic rays
• Formation of large-scale magnetic structures associated with the Fermi bubbles
• Multi-wavelength Emission from the Fermi Bubble II. Secondary Electrons and the Hadronic Model of the Bubble
• Multi-wavelength Emission from the Fermi Bubble I. Stochastic acceleration from Background Plasma
• The spectral index of polarized diffuse Galactic emission between 30 and 44 GHz
• Emission from hadronic and leptonic processes in galactic jet-driven bubbles
• Three-Dimensional Aquila Rift: Magnetized HI Arch Anchored by Molecular Complex
• QUIJOTE scientific results -- VI. The Haze as seen by QUIJOTE
• The Fermi bubbles as a Superbubble
• Multi-wavelength emission from leptonic processes in ageing galaxy bubbles
• Detection of polarized Fermi-bubble synchrotron and dust emission