The Spectrum and Morphology of the Fermi Bubbles
Fermi-LAT Collaboration

TL;DR
This paper analyzes 50 months of Fermi LAT data to characterize the spectrum and morphology of the Fermi bubbles, revealing their spectral shape, luminosity, and boundary features, and discusses possible emission models.
Contribution
It provides a detailed spectral and morphological analysis of the Fermi bubbles using systematic uncertainty exploration and compares emission models including inverse Compton and hadronic scenarios.
Findings
Gamma-ray spectrum fits a log parabola or exponential cutoff
Luminosity of the bubbles is approximately 4.4 x 10^37 erg/s
No significant spectral variation across the bubbles
Abstract
The Fermi bubbles are two large structures in the gamma-ray sky extending to above and below the Galactic center. We analyze 50 months of Fermi Large Area Telescope data between 100 MeV and 500 GeV above in Galactic latitude to derive the spectrum and morphology of the Fermi bubbles. We thoroughly explore the systematic uncertainties that arise when modeling the Galactic diffuse emission through two separate approaches. The gamma-ray spectrum is well described by either a log parabola or a power law with an exponential cutoff. We exclude a simple power law with more than 7 significance. The power law with an exponential cutoff has an index of and a cutoff energy of GeV. We find that the gamma-ray luminosity of the bubbles is erg s. We confirm a significant enhancement of gamma-ray emission…
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