Summer Seminar: "The Galactic Center Environment and the Galactic Center GeV Excess" Tim Linden (Physics)

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August 16, 2016
11:30AM - 12:30PM
Location
4138 PRB

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Add to Calendar 2016-08-16 11:30:00 2016-08-16 12:30:00 Summer Seminar: "The Galactic Center Environment and the Galactic Center GeV Excess" Tim Linden (Physics) The Milky Way Galactic Center is the most extreme astrophysical environment that is currently resolvable at gamma-ray energies -- and cosmic-rays accelerated in the inner degrees of our galaxy power numerous excesses observable across the electromagnetic spectrum. Recently, Fermi-LAT observations have discovered a significant gamma-ray excess centered coincident with the position of Sgr A*. While this excess may be explained by populations of gamma-ray pulsars or by dark matter annihilation, it is worth noting that the intensity of this excess is comparable to the systematic uncertainties in the diffuse astrophysical gamma-ray emission near the Galactic plane. Thus, a detailed understanding of the intensity, spectrum, and morphology of gamma-rays from hadronic and leptonic processes in the Galactic center is necessary to determine both the existence and characteristics of the gamma-ray excess. In this talk, I will discuss significant improvements in gamma-ray diffuse emission modeling that enhance our understanding of high energy astrophysics near the Galactic center, and will describe the impact of these models on our understanding of the gamma-ray excess. 4138 PRB Center for Cosmology and AstroParticle Physics (CCAPP) ccapp@osu.edu America/New_York public
Description

The Milky Way Galactic Center is the most extreme astrophysical environment that is currently resolvable at gamma-ray energies -- and cosmic-rays accelerated in the inner degrees of our galaxy power numerous excesses observable across the electromagnetic spectrum. Recently, Fermi-LAT observations have discovered a significant gamma-ray excess centered coincident with the position of Sgr A*. While this excess may be explained by populations of gamma-ray pulsars or by dark matter annihilation, it is worth noting that the intensity of this excess is comparable to the systematic uncertainties in the diffuse astrophysical gamma-ray emission near the Galactic plane. Thus, a detailed understanding of the intensity, spectrum, and morphology of gamma-rays from hadronic and leptonic processes in the Galactic center is necessary to determine both the existence and characteristics of the gamma-ray excess. In this talk, I will discuss significant improvements in gamma-ray diffuse emission modeling that enhance our understanding of high energy astrophysics near the Galactic center, and will describe the impact of these models on our understanding of the gamma-ray excess.

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