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Title: The Spectrum And Morphology Of The Fermi Bubbles

Journal Article · · The Astrophysical Journal (Online)
 [1]
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); et al.

The Fermi bubbles are two large structures in the gamma-ray sky extending to 55° above and below the Galactic center. We analyze 50 months of Fermi Large Area Telescope data between 100 MeV and 500 GeV above 10° 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 7σ signi cance. The power law with an exponential cutoff has an index of 1:9±0:2 and a cutoff energy of 110 ± 50 GeV. We nd that the gamma-ray luminosity of the bubbles is 4:4+2:4 -0:9 X 1037 erg s-1. We confirm a signi cant enhancement of gamma-ray emission in the south-eastern part of the bubbles, but we do not nd signi cant evidence for a jet. No signi cant variation of the spectrum across the bubbles is detected. The width of the boundary of the bubbles is estimated to be 3:4+3:7 -2:6 deg. Both inverse Compton (IC) models and hadronic models including IC emission from secondary leptons t the gamma-ray data well. In the IC scenario, the synchrotron emission from the same population of electrons can also explain the WMAP and Planck microwave haze with a magnetic eld between 5 and 20 μG.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356448
Journal Information:
The Astrophysical Journal (Online), Vol. 793, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 190 works
Citation information provided by
Web of Science

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The Galactic Center GeV excess from a series of leptonic cosmic-ray outbursts journal December 2015
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On the progressive hardening of the cosmic-ray proton spectrum in the inner Galaxy journal October 2018
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Winds and feedback from supermassive black holes accreting at low rates: hydrodynamical treatment journal January 2020
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The C-Band All-Sky Survey (C-BASS): design and capabilities journal July 2018
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Search for Sources of Astrophysical Neutrinos Using Seven Years of IceCube Cascade Events text January 2019
X-Ray and Gamma-Ray Observations of the Fermi Bubbles and NPS/Loop I Structures journal February 2018
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The Fermi Galactic Center GeV Excess and Implications for Dark Matter journal May 2017
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Planck 2015 results. XXV. Diffuse low-frequency Galactic foregrounds text January 2015
CHANG-ES IV: Radio continuum emission of 35 edge-on galaxies observed with the Karl G. Jansky Very Large Array in D-configuration, Data Release 1 text January 2015
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Galactic Bulge Preferred Over Dark Matter for the Galactic Center Gamma-Ray Excess text January 2016
A theoretical explanation for the Central Molecular Zone asymmetry text January 2017
Imprints of Cosmic Rays in Multifrequency Observations of the Interstellar Emission text January 2017
X-ray and Gamma-ray Observations of the Fermi Bubbles and NPS/Loop I Structures text January 2018
Possible connection between the asymmetry of North Polar Spur and Loop I with Fermi Bubbles text January 2018
The C-Band All-Sky Survey (C-BASS): Design and capabilities text January 2018
On the progressive hardening of the cosmic-ray proton spectrum in the inner Galaxy text January 2018
The Bending Feature of the Fermi Bubbles: A Presumed Horizontal Galactic Wind and Its Implication on the Bubbles' Age text January 2018
A Review of Recent Observations of Galactic Winds Driven by Star Formation text January 2018
X-ray Observation of a Magnetized Hot Gas Outflow in the Galactic Center Region text January 2019
Hard and bright gamma-ray emission at the base of the Fermi bubbles text January 2019
Cosmic rays escaping from Galactic starburst-driven superbubbles text January 2019
Winds and feedback from supermassive black holes accreting at low rates: Hydrodynamical treatment text January 2019
Search for Sources of Astrophysical Neutrinos Using Seven Years of IceCube Cascade Events text January 2019
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