Fermi-bubble bulk and edge analysis reveals dust, cooling breaks, and cosmic-ray diffusion, facilitating a self-consistent model

Abstract

The full, radio to $\gamma$-ray spectrum of the Fermi bubbles is shown to be consistent with standard strong-shock electron acceleration at the bubble edge, without the unnatural energy cutoffs and unrealistic electron cooling of previous studies, if the ambient interstellar radiation is strong; the $\gamma$-ray cooling break should then have a microwave counterpart, undetected until now. Indeed, a broadband bubble-edge analysis uncovers a pronounced downstream dust component, which masked the anticipated $\sim 35$ GHz spectral break, and the same overall radio softening consistent with Kraichnan diffusion previously reported in $\gamma$-rays.

arXiv commentTo appear in ApJ

References in corpus (25)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Fermi Large Area Telescope Fourth Source Catalog
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• Chandra X-ray Spectroscopic Imaging of Sgr A* and the Central Parsec of the Galaxy
• Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS
• IRIS: A new generation of IRAS maps
• Fermi-LAT Observations of High-Energy Gamma-Ray Emission Toward the Galactic Center
• The Spectrum and Morphology of the Fermi Bubbles
• Microwave ISM Emission Observed by WMAP
• The Large-scale Bipolar Wind in the Galactic Center
• The Fermi Haze: A Gamma-Ray Counterpart to the Microwave Haze
• The Fermi Bubbles: Giant, Multi-Billion-Year-Old Reservoirs of Galactic Center Cosmic Rays
• The Structure of the Milky Way's Hot Gas Halo
• A radiation transfer model for the Milky-Way: I. Radiation fields and application to High Energy Astrophysics
• Suzaku observations of the diffuse x-ray emission across the fermi bubbles' edges
• The $AKARI$ Far-Infrared All-Sky Survey Maps
• The Fermi Bubbles: Gamma-ray, Microwave, and Polarization Signatures of Leptonic AGN Jets
• The Case for a Low Extragalactic Gamma-ray Background
• A Last Look at the Microwave Haze/Bubbles with WMAP
• The Fermi Bubbles as a Scaled-up Version of Supernova Remnants
• Identifying the Radio Bubble Nature of the Microwave Haze
• Fermi bubble edges: spectrum and diffusion function
• Misaligned jets from Sgr A${}^{\ast }$ and the origin of Fermi/eROSITA bubbles
• Fermi bubbles: high latitude X-ray supersonic shell
• Diffusive shock-acceleration: breakdown of spatial diffusion and isotropy

Cited by in corpus (1)

• Detection of polarized Fermi-bubble synchrotron and dust emission