GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates - INSPIRE

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GeV excess in the Milky Way: The role of diffuse galactic gamma-ray emission templates

Bei Zhou
(
- Purple Mountain Observ. and
- Beijing, GUCAS
)
,
Yun-Feng Liang
(
- Purple Mountain Observ. and
- Beijing, GUCAS
)
,
Xiaoyuan Huang
(
- Purple Mountain Observ.
)
,
Xiang Li
(
- Purple Mountain Observ. and
- Beijing, GUCAS
)
,
Yi-Zhong Fan
(
- Purple Mountain Observ.
)

Jun 26, 2014

12 pages

Published in:

Phys.Rev.D 91 (2015) 12, 123010

Published: Jun 18, 2015

e-Print:

1406.6948 [astro-ph.HE]

DOI:

10.1103/PhysRevD.91.123010

View in:

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Abstract: (APS)

Several groups have analyzed the publicly available Fermi-LAT data and have reported a spatially extended γ ray excess of around 1–3 GeV from the region surrounding the Galactic center that might originate from annihilation of dark-matter particles with a rest mass mχ∼30−40 GeV. In this work we examine the role of the diffuse galactic gamma-ray emission templates played in suppressing the GeV excess. For such a purpose, we adopt in total 128 background templates that were generated by Ackermann et al. [Astrophys. J. 750, 3 (2012)] in the study of the Fermi-LAT observations of the diffuse gamma-ray emission considering the effects of cosmic rays and the interstellar medium. The possible GeV excess, assumed to follow the spatial distribution of the prompt gamma rays produced in the annihilation of dark-matter particles taking a generalized Navarro-Frenk-White profile with an inner slope α=1.2, has been analyzed in some regions of interest. The introduction of such an additional component centered at the Galactic center is found to have improved the goodness of fit to the data significantly in all background template models regardless of whether the excess spectrum is fixed or not. Our results thus suggest that the presence of a statistically significant GeV excess in the inner Galaxy is robust, though its spectrum depends on the diffuse galactic gamma-ray emission model adopted in the analysis. The possible physical origin of the GeV excess component is discussed and, in the dark-matter model, the annihilation cross section of such particles is evaluated.

Note:

12 pages, 6 figures •
14 pages, 9 figures. Accepted for publication in PRD, moderate revision but main conclusions unchanged

98.70.Rz
95.35.+d
gamma ray: emission
gamma ray: galaxy
dark matter: annihilation
GLAST
bubble
cosmic radiation
background

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