Fermi Bubbles under Dark Matter Scrutiny. Part I: Astrophysical Analysis - INSPIRE

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Fermi Bubbles under Dark Matter Scrutiny. Part I: Astrophysical Analysis

Wei-Chih Huang
(
- SISSA, Trieste and
- INFN, Trieste
)
,
Alfredo Urbano
(
- SISSA, Trieste
)
,
Wei Xue
(
- SISSA, Trieste and
- INFN, Trieste
)

Jul 25, 2013

23 pages

e-Print:

1307.6862 [hep-ph]

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Abstract: (arXiv)

The quest for Dark Matter signals in the gamma-ray sky is one of the most intriguing and exciting challenges in astrophysics. In this paper we perform the analysis of the energy spectrum of the \textit{Fermi bubbles} at different latitudes, making use of the gamma-ray data collected by the Fermi Large Area Telescope. By exploring various setups for the full-sky analysis we achieve stable results in all the analyzed latitudes. At high latitude,

|b|=20^{\circ}-50^{\circ}

, the \textit{Fermi bubbles} energy spectrum can be reproduced by gamma-ray photons generated by inverse Compton scattering processes, assuming the existence of a population of high-energy electrons. At low latitude,

|b|=10^{\circ}-20^{\circ}

, the presence of a bump at

E_{\gamma}\sim 1-4

GeV, reveals the existence of an extra component compatible with Dark Matter annihilation. Our best-fit candidate corresponds to annihilation into

b\bar{b}

with mass

M_{\rm DM}= 61.8^{+6.9}_{-4.9}

GeV and cross section

<\sigma v> = 3.30^{+0.69}_{-0.49}\times 10^{-26}

cm

^{3}

s

^{-1}

. In addition, using the energy spectrum of the \textit{Fermi bubbles}, we derive new conservative but stringent upper limits on the Dark Matter annihilation cross section.

Note:

23 pages + 2 appendices, 19 figures; v2: minor changes, various comments added in all the sections

new physics
dark matter: mass
dark matter: annihilation
cross section: annihilation
cross section: upper limit
Compton scattering: inverse
GLAST
gamma ray: energy spectrum
gamma ray: cosmic radiation
cosmic radiation: energy spectrum

References(35)

Figures(53)

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