Astrophysical and dark matter interpretations of extended gamma-ray emission from the Galactic Center

Abazajian, Kevork N.; Canac, Nicolas; Horiuchi, Shunsaku; Kaplinghat, Manoj

doi:10.1103/physrevd.90.023526

Cited by 406 publications

(669 citation statements)

References 40 publications

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“…for m χ 60 GeV. This region may in fact be compatible with the Galactic Center gamma-ray excess [49][50][51][52][53][54] although reproducing it in vicinity of the s-channel resonances is in general rather contrived [55]. The second region corresponds to masses m χ ∼ 170 − 230 GeV.…”

Section: Jhep12(2016)081mentioning

confidence: 71%

Multicomponent Dark Matter from gauge symmetry

Arcadi

Groß

Lebedev

et al. 2016

J. High Energ. Phys.

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The composition of Dark Matter (DM) remains an important open question. The current data do not distinguish between single-and multi-component DM, while in theory constructions it is often assumed that DM is composed of a single field. In this work, we study a hidden sector which naturally entails multicomponent DM consisting of spin-1 and spin-0 states. This UV complete set-up is based on SU(3) hidden gauge symmetry with the minimal scalar field content to break it spontaneously. The presence of multiple DM components is a result of a residual Z 2 × Z 2 symmetry which is part of an unbroken global U(1) × Z 2 inherent in the Yang-Mills systems. We find that the model exhibits various parametric regimes with drastically different DM detection prospects. In particular, we find that the direct detection cross section is much suppressed in large regions of parameter space as long as the Standard Model Higgs mixes predominantly with a single scalar from the hidden sector. The resulting scattering rate is often beyond the level of sensitivity of XENON1T, while still being consistent with the thermal WIMP paradigm.

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Section: Jhep12(2016)081mentioning

confidence: 71%

Multicomponent Dark Matter from gauge symmetry

Arcadi

Groß

Lebedev

et al. 2016

J. High Energ. Phys.

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“…Although millisecond pulsars may be a plausible source [24,25], the possibility of dark matter annihilation has been vigorously pursued; for a recent discussion with references see [26]. Analyses of the data indicate that 40 GeV dark matter annihilating into bb provide a good fit to the signal [24].…”

Section: Galactic Center Gamma Ray Excessmentioning

confidence: 99%

The windows for kinetically mixed Z′-mediated dark matter and the galactic center gamma ray excess

Cline

Dupuis

Liu

et al. 2014

J. High Energ. Phys.

125

136

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One of the simplest hidden sectors with signatures in the visible sector is fermionic dark matter χ coupled to a Z gauge boson that has purely kinetic mixing with the standard model hypercharge. We consider the combined constraints from relic density, direct detection and collider experiments on such models in which the dark matter is either a Dirac or a Majorana fermion. We point out sensitivity to details of the UV completion for the Majorana model. For kinetic mixing parameter ≤ 0.01, only relic density and direct detection are relevant, while for larger , electroweak precision, LHC dilepton, and missing energy constraints become important. We identify regions of the parameter space of m χ , m Z , dark gauge coupling and that are most promising for discovery through these experimental probes. We study the compatibility of the models with the galactic center gamma ray excess, finding agreement at the 2-3σ level for the Dirac model.

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“…In addition to the astrophysical explanations, the observed GeV emission might also originate from the annihilation of dark matter particles (see e.g. Hooper & Linden 2011;Hooper & Goodenough 2011;Abazajian et al 2014). In this scenario, the signal from the central "spike" of the Galactic dark matter halo is expected to be extended.…”

Section: Introductionmentioning

confidence: 98%

Leptonic origin of the 100 MeVγ-ray emission from the Galactic centre

Malyshev

Chernyakova

Neronov

et al. 2015

A&A

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Context. The Galactic centre is a bright γ-ray source with the GeV−TeV band spectrum composed of two distinct components in the 1−10 GeV and 1−10 TeV energy ranges. The nature of these two components is not clearly understood. Aims. We investigate the γ-ray properties of the Galactic centre to clarify the origin of the observed emission. Methods. We report imaging, spectral, and timing analysis of data from 74 months of observations of the Galactic centre by Fermi/LAT γ-ray telescope complemented by sub-MeV data from approximately ten years of INTEGRAL/PICsIT observations. Results. We find that the Galactic centre is spatially consistent with the point source in the GeV band. The tightest 3σ upper limit on its radius is 0.13 • in the 10−300 GeV energy band. The spectrum of the source in the 100 MeV energy range does not have a characteristic turnover that would point to the pion decay origin of the signal. Instead, the source spectrum is consistent with a model of inverse Compton scattering by high-energy electrons. In this a model, the GeV bump in the spectrum originates from an episode of injection of high-energy particles, which happened ∼300 years ago. This injection episode coincides with the known activity episode of the Galactic centre region, previously identified using X-ray observations. The hadronic model of source activity could be still compatible with the data if bremsstrahlung emission from high-energy electrons was present in addition to pion decay emission.

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Astrophysical and dark matter interpretations of extended gamma-ray emission from the Galactic Center

Cited by 406 publications

References 40 publications

Multicomponent Dark Matter from gauge symmetry

Multicomponent Dark Matter from gauge symmetry

The windows for kinetically mixed Z′-mediated dark matter and the galactic center gamma ray excess

Leptonic origin of the 100 MeVγ-ray emission from the Galactic centre

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