Constraints on the dark matter annihilation scenario of Fermi 130 GeV $\gamma$-ray line emission by continuous gamma-rays, Milky Way halo, galaxy clusters and dwarf galaxies observations - INSPIRE

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Constraints on the dark matter annihilation scenario of Fermi 130 GeV $\gamma$ -ray line emission by continuous gamma-rays, Milky Way halo, galaxy clusters and dwarf galaxies observations

Xiaoyuan Huang
(
- Beijing Observ.
)
,
Qiang Yuan
(
- Beijing, Inst. High Energy Phys. and
- Purple Mountain Observ.
)
,
Peng-Fei Yin
(
- Beijing, Inst. High Energy Phys.
)
,
Xiao-Jun Bi
(
- Beijing, Inst. High Energy Phys.
)
,
Xuelei Chen
(
- Beijing Observ.
)

Aug, 2012

7 pages

Published in:

JCAP 11 (2012) 048,
JCAP 05 (2013) E02 (erratum)

Published: 2013

e-Print:

1208.0267 [astro-ph.HE]

DOI:

View in:

ADS Abstract Service

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Abstract: (IOP)

It was recently reported that there may exist monochromatic

\gamma

-ray emission at

\sim 130

GeV from the Galactic center in the Fermi Large Area Telescope data, which might be related with dark matter (DM) annihilation. In this work we carry out a comprehensive check of consistency of the results with the DM annihilation scenario, using the 3.7 yrs Fermi observation of the inner Galaxy, Galactic halo, clusters of galaxies and dwarf galaxies. The results found are as follows. 1) Very strong constraints on the DM annihilation into continuous

\gamma

-rays from the Galactic center are set, which are as stringent as the 'natural' scale assuming thermal freeze-out of DM. Such limit sets strong constraint on the DM models to explain the line emission. 2) No line emission from the Galactic halo is found in the Fermi data, and the constraints on line emission is marginally consistent with the DM annihilation interpretation of the

\sim 130

GeV line emission from the inner Galaxy. 3) No line emission from galaxy clusters and dwarf galaxies is detected, although possible concentration of photons from clusters in 120-140 GeV is revealed. The constraints from clusters and dwarf galaxies are weak and consistent with the DM annihilation scenario to explain the

\sim 130

GeV line emission.

Note:

16 pages (JHEP style), 6 figures and 1 table; added discussion on the continuous background for line search; accepted by JCAP

95.85.Pw
95.35.+d
dark matter: annihilation
dark matter: galaxy: halo
freeze-out: thermal
gamma ray: emission
GLAST
cross section: annihilation
galaxy: cluster
dark matter: mass

References(59)

Figures(9)

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(
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,
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(
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,
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,
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(
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•
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- 1205.6811
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