# The Galactic Center GeV Excess from a Series of Leptonic Cosmic-Ray Outbursts

@article{Cholis2015TheGC,
title={The Galactic Center GeV Excess from a Series of Leptonic Cosmic-Ray Outbursts},
author={Ilias Cholis and Carmelo Evoli and Francesca Calore and Tim Linden and C Weniger and Dan Hooper},
journal={arXiv: High Energy Astrophysical Phenomena},
year={2015}
}
• Published 16 June 2015
• Physics, Geology
• arXiv: High Energy Astrophysical Phenomena
It has been proposed that a recent outburst of cosmic-ray electrons could account for the excess of GeV-scale gamma rays observed from the region surrounding the Galactic Center. After studying this possibility in some detail, we identify scenarios in which a series of leptonic cosmic-ray outbursts could plausibly generate the observed excess. The morphology of the emission observed outside of $\sim1^{\circ}-2^{\circ}$ from the Galactic Center can be accommodated with two outbursts, one which…

## Figures and Tables from this paper

Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess
• Physics
• 2015
A spherical-symmetric gamma-ray emission from the central region of the Galaxy has been recently identified in Fermi-LAT data, and initially associated to dark matter particle annihilations. Guided
What can Fermi LAT observation of the Galactic Centre tell us about its active past?
• Physics
Proceedings of the International Astronomical Union
• 2016
Abstract The Fermi-LAT gamma-ray data in the inner Galaxy region show several prominent features possibly related to the past activity of the Milky Way’s super massive black hole. At a large, 50 deg
Investigating the Uniformity of the Excess Gamma rays towards the Galactic Center Region
• Physics
• 2016
We perform a composite likelihood analysis of subdivided regions within the central $26^\circ\times20^\circ$ of the Milky Way, with the aim of characterizing the spectrum of the gamma-ray galactic
The Fermi Galactic Center GeV Excess and Implications for Dark Matter
• Physics
• 2017
The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of
Astrophysical contributions to the Fermi Galactic Centre GeV excess.
An excess of GeV gamma rays above the expected astrophysical background has been detected in the region of the sky towards the centre of the Milky Way using observations from the Fermi Large Area
Cosmic Rays Interacting with Molecular Clouds in the Galactic Center
• Physics
• 2016
The High-Energy Stereoscopic System (H.E.S.S.) has detected diffuse TeV emission correlated with the distribution of molecular gas along the Ridge at the Galactic Center. Diffuse, nonthermal emission
Strong evidence that the galactic bulge is shining in gamma rays
• Physics
Journal of Cosmology and Astroparticle Physics
• 2019
There is growing evidence that the Galactic Center Excess identified in the $\textit{Fermi}$-LAT gamma-ray data arises from a population of faint astrophysical sources. We provide compelling
Galactic dark matter search via phenomenological astrophysics modeling
• Physics
• 2015
Previous searches for the $\gamma$-ray signatures of annihilating galactic dark matter used predefined spatial templates to describe the background of $\gamma$-ray emission from astrophysical
Radio detection prospects for a bulge population of millisecond pulsars as suggested by fermi-lat observations of the inner galaxy
• Physics
• 2016
Analogously to globular clusters, the dense stellar environment of the Galactic center has been proposed to host a large population of as-yet undetected millisecond pulsars (MSPs). Recently, this
An alternative Explanation for the Fermi GeV Gamma-Ray Excess
• Physics
• 2016
The "GeV-excess" of the diffuse gamma-rays in the halo is studied with a template fit based on energy spectra for each possible process of gamma-ray emission. Such a fit allows to determine the

## References

SHOWING 1-10 OF 113 REFERENCES
Galactic Center gamma-ray "excess" from an active past of the Galactic Centre?
• Physics
• 2014
Several groups have recently claimed evidence for an unaccounted gamma-ray excess over the diffuse backgrounds at few GeV in the Fermi-LAT data in a region around the Galactic Center, consistent with
Background model systematics for the Fermi GeV excess
• Physics
• 2014
The possible gamma-ray excess in the inner Galaxy and the Galactic center (GC) suggested by Fermi-LAT observations has triggered a large number of studies. It has been interpreted as a variety of
Cosmic ray protons in the inner Galaxy and the Galactic Center gamma-ray excess
• Physics
• 2014
A gamma-ray excess over background has been claimed in the inner regions of the Galaxy, triggering some excitement about the possibility that the gamma rays originate from the annihilation of dark
Millisecond pulsars cannot account for the inner Galaxy’s GeV excess
• Physics
• 2013
Using data from the Fermi Gamma-Ray Space Telescope, a spatially extended component of gamma rays has been identified from the direction of the Galactic center, peaking at energies of ∼2–3  GeV. More
Strong Support for the Millisecond Pulsar Origin of the Galactic Center GeV Excess.
• Physics
Physical review letters
• 2016
It is argued that other extragalactic or Galactic sources, a mismodeling of Galactic diffuse emission, or the thick-disk population of pulsars are unlikely to account for this observation of clear excess emission in the Inner Galaxy.
GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates
• Physics
• 2015
Several groups have analyzed the publicly available Fermi-LAT data and have reported a spatially extended. ray excess of around 1-3 GeV from the region surrounding the Galactic center that might
On The Origin Of The Gamma Rays From The Galactic Center
• Physics
• 2011
The region surrounding the center of the Milky Way is both astrophysically rich and complex, and is predicted to contain very high densities of dark matter. Utilizing three years of data from the
Searching for the high-energy neutrino counterpart signals: The case of the Fermi bubbles signal and of dark matter annihilation in the inner Galaxy
The recent uncovering of the Fermi bubbles/haze in the Fermi $\ensuremath{\gamma}$-ray data has generated theoretical work to explain such a signal of hard $\ensuremath{\gamma}$ rays in combination
Assessing the Feasibility of Cosmic-Ray Acceleration by Magnetic Turbulence at the Galactic Center
• Physics
• 2012
The presence of relativistic particles at the center of our galaxy is evidenced by the diffuse TeV emission detected from the inner ∼2 ◦ of the Galaxy. Although it is not yet entirely clear whether