scholarly journals Bright gamma-ray Galactic Center excess and dark dwarfs: Strong tension for dark matter annihilation despite Milky Way halo profile and diffuse emission uncertainties

2016 ◽  
Vol 93 (8) ◽  
Author(s):  
Kevork N. Abazajian ◽  
Ryan E. Keeley
Keyword(s):  
Dark Matter ◽  
Milky Way ◽  
Gamma Ray ◽  
Galactic Center ◽  
Diffuse Emission ◽  
Dark Matter Annihilation ◽  
Milky Way Halo

scholarly journals Understanding the diffuse gamma ray emission of the milky way - from supernova remnants to dark matter

2019 ◽  
pp. 17-22
Author(s):  
Jovana Petrovic ◽  
Tijana Prodanovic ◽  
Milos Kovacevic
Keyword(s):  
Dark Matter ◽  
Supernova Remnants ◽  
Milky Way ◽  
Gamma Ray ◽  
Galactic Center ◽  
Galactic Disk ◽  
High Energy ◽  
Data Sets ◽  
Source Population ◽  
Gamma Ray Emission

Diffuse gamma ray emission from the Galactic center at 2-3 GeV, as well as the 12 TeV gamma ray excess in the Galactic disk, remain open for debate and represent the missing puzzles in the complete picture of the high-energy Milky Way sky. Our papers emphasize the importance of understanding all of the populations that contribute to the diffuse gamma background in order to discriminate between the astrophysical sources such as supernova remnants and pulsars, and something that is expected to be seen in gamma rays and is much more exotic - dark matter. We analyze two separate data sets that have been measured in different energy ranges from the ?Fermi-LAT? and ?Milagro? telescopes, using these as a powerful tool to limit and test our analytical source population models. We model supernova remnants and pulsars, estimating the number of still undetected ones that contribute to the diffuse background, trying to explain both the Galactic center and the 12 TeV excess. Furthermore, we aim to predict the number of soon to be detected sources with new telescopes, such as the ?HAWC?.

scholarly journals Relieving Tensions Related to the Dark Matter Interpretation of the Fermi-LAT Data

Galaxies ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 92
Author(s):  
Man Chan
Keyword(s):  
Dark Matter ◽  
Synchrotron Radiation ◽  
Milky Way ◽  
Gamma Ray ◽  
Feedback Process ◽  
Dark Matter Annihilation ◽  
Dwarf Spheroidal Galaxies ◽  
Matter Model ◽  
Consistent Picture ◽  
Dark Matter Model

Recently, many studies indicate that the GeV gamma ray excess signal from the central Milky Way can be best explained by ∼40–50 GeV dark matter annihilating via the b b ¯ channel. However, this model appears to be disfavored by the recent Fermi-LAT data for dwarf spheroidal galaxies and the constraint from synchrotron radiation. In this article, we describe a consistent picture to relieve the tensions between the dark matter annihilation model and the observations. We show that a baryonic feedback process is the key to alleviate the tensions and the ∼40–50 GeV dark matter model is still the best one to account for the GeV gamma ray excess in the Milky Way.

scholarly journals Fermi–LAT Observations toward the Galactic Center

2016 ◽  
Vol 11 (S322) ◽  
pp. 11-20
Author(s):  
Simona Murgia
Keyword(s):  
Dark Matter ◽  
Milky Way ◽  
Galactic Center ◽  
Point Sources ◽  
Source Detection ◽  
Large Area ◽  
Dark Matter Annihilation ◽  
Γ Rays ◽  
Inner Region

AbstractThe inner region of the Milky Way is one of the most interesting and complex regions of the γ-ray sky. Intense interstellar emission and point sources contribute to it, as well as other potential components such as an unresolved population of point sources and dark matter. In recent years, claims have been made of an excess consistent with a dark matter annihilation signal in the data collected with the Fermi Large Area Telescope (Fermi–LAT). Although these results are intriguing, the complexity involved in modeling the foreground and background emission from conventional astrophysical sources of γ-rays makes a conclusive interpretation of these results challenging. In these proceedings, I discuss Fermi–LAT observations of the Galactic center region, the methodology for point source detection and treatment of the interstellar emission, the characterization of the GeV excess, and implications for dark matter.

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