Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of a New Galactic Center Excess Consistent with Upscattered
  Starlight   We present a new extended gamma ray excess detected with the Fermi Satellite
Large Area Telescope toward the Galactic Center that traces the morphology of
infrared starlight emission. Combined with its measured spectrum, this new
extended source is approximately consistent with inverse Compton emission from
a high-energy electron-positron population with energies up to about 10 GeV.
Previously detected emissions tracing the 20 cm radio, interpreted as
bremsstrahlung radiation, and the Galactic Center Extended emission tracing a
spherical distribution and peaking at 2 GeV, are also detected. We show that
the inverse Compton and bremsstrahlung emissions are likely due to the same
source of electrons and positrons. All three extended emissions may be
explained within the framework of a model where the dark matter annihilates to
leptons or a model with unresolved millisecond pulsars in the Galactic Center.

37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics