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Addressing $\gamma$-ray emissions from dark matter annihilations in 45 milky way satellite galaxies and in extragalactic sources with particle dark matter models
Cosmology and Nongalactic Astrophysics · Submitted 5 Oct 2019
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In this work, we consider particle dark matter models described in the literature and after studying their phenomenologies, we calculate the $\gamma$-ray fluxes from the self annihilation of the dark matter within the framework of these models in case of each of these 45 dSphs. we then compare the computed results with the observational upper bounds for $\gamma$-ray flux reported by Fermi-LAT and Dark Energy Survey (DES) for each of the 45 dSphs.
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The abstract, sentence by sentence
The mass to luminosity ratio of the dwarf satellite galaxies in the Milky Way suggests that these dwarf galaxies may contain substantial dark matter. The dark matter at the dense region such as within or at the vicinity of the centres of these dwarf galaxies may undergo the process of self annihilation and produce $\gamma$-rays as the end product. The satellite borne $\gamma$-ray telescope such as Fermi-LAT reported the detection of $\gamma$-rays from around 45 Dwarf Spheroidals (dSphs) of Milky Way. In this work, we consider particle dark matter models described in the literature and after studying their phenomenologies, we calculate the $\gamma$-ray fluxes from the self annihilation of the dark matter within the framework of these models in case of each of these 45 dSphs. we then compare the computed results with the observational upper bounds for $\gamma$-ray flux reported by Fermi-LAT and Dark Energy Survey (DES) for each of the 45 dSphs. The fluxes are calculated by adopting different dark matter density profiles. We then extend similar analysis for the observational upper bounds given by Fermi-LAT for the continuum $\gamma$-ray fluxes originating from extragalactic sources.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The mass to luminosity ratio of the dwarf satellite galaxies in the Milky Way suggests that these dwarf galaxies may contain substantial dark matter. | background 1.00 | 0.08 | 0.03 | hedged possibility 1.00 |
| s1 | The dark matter at the dense region such as within or at the vicinity of the centres of these dwarf galaxies may undergo the process of self annihilation and produce $\gamma$-rays as the end product. | background 1.00 | 0.05 | 0.03 | hedged possibility 0.99 |
| s2 | The satellite borne $\gamma$-ray telescope such as Fermi-LAT reported the detection of $\gamma$-rays from around 45 Dwarf Spheroidals (dSphs) of Milky Way. | background 0.98 | 0.05 | 0.03 | asserted 1.00 |
| s3 | In this work, we consider particle dark matter models described in the literature and after studying their phenomenologies, we calculate the $\gamma$-ray fluxes from the self annihilation of the dark matter within the framework of these models in case of each of these 45 dSphs. we then compare the computed results with the observational upper bounds for $\gamma$-ray flux reported by Fermi-LAT and Dark Energy Survey (DES) for each of the 45 dSphs. | contribution 0.67 | 0.95 | 0.09 | asserted 0.97 |
| s4 | The fluxes are calculated by adopting different dark matter density profiles. | method 1.00 | 0.83 | 0.02 | asserted 0.99 |
| s5 | We then extend similar analysis for the observational upper bounds given by Fermi-LAT for the continuum $\gamma$-ray fluxes originating from extragalactic sources. | contribution 0.94 | 0.84 | 0.04 | asserted 0.96 |
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The paper
Original abstract
The mass to luminosity ratio of the dwarf satellite galaxies in the Milky Way suggests that these dwarf galaxies may contain substantial dark matter. The dark matter at the dense region such as within or at the vicinity of the centres of these dwarf galaxies may undergo the process of self annihilation and produce $\gamma$-rays as the end product. The satellite borne $\gamma$-ray telescope such as Fermi-LAT reported the detection of $\gamma$-rays from around 45 Dwarf Spheroidals (dSphs) of Milky Way. In this work, we consider particle dark matter models described in the literature and after studying their phenomenologies, we calculate the $\gamma$-ray fluxes from the self annihilation of the dark matter within the framework of these models in case of each of these 45 dSphs. we then compare the computed results with the observational upper bounds for $\gamma$-ray flux reported by Fermi-LAT and Dark Energy Survey (DES) for each of the 45 dSphs. The fluxes are calculated by adopting different dark matter density profiles. We then extend similar analysis for the observational upper bounds given by Fermi-LAT for the continuum $\gamma$-ray fluxes originating from extragalactic sources.
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How the literature uses it
3 arXiv papers cite this in 4 sentences
Papers citing it · 3 sentences without a confident label
Cites it as background 1 paper
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This relevance is, of course, determined jointly by their rates and the detectability (in terms of the final particle identities and the energies they carry), in such facilities, earth-bound or satellite-based [ref] .
Gamma-ray and Synchrotron Radiation from Dark Matter annihilations in Ultra-faint Dwarf Galaxies · $γ$-ray flux from pair-annihilation of WIMPs · 0.86
What it cites · 36 sentences without a confident label
Uses the method or tool of 3 papers
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For the case of $B^1$ dark matter, the annihilation cross-section $B^1 B^1 ⟶qq$ is computed from the expression [ref] [equation] where $q_L^1$ is the first KK partner of the quark $q_L$, $Y_q_L^1$ and $m_q_L^1$ are respectively the corresponding hypercharge and mass while $θ_W$ is the Weinberg angle.
Kaluza-Klein Dark Matter · Formalism for $γ$-ray flux calculations in case of dwarf galaxies from dark matter annihilation · 0.92
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The multiplicity function $f(ν)$ in Eq. [ref] is computed using the relation [ref] , [equation] where $ν'=√(a)ν$.
Large scale bias and the peak background split · Extragalactic $γ$-ray background and extragalactic $γ$-rays from dark matter annihilations · 0.91
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In order to generate this demonstrative plot, all the necessary numerical calculations have been executed by performing HMFcalc [ref] code.
HMFcalc: An Online Tool for Calculating Dark Matter Halo Mass Functions · Extragalactic $γ$-ray background and extragalactic $γ$-rays from dark matter annihilations · 1.00
Uses data or values from 8 papers
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These Fermi-LAT observations upper bounds are obtained from [ref] .
Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT · The $γ$-ray flux calculations for the dwarf galaxies and their comparison with the observations · 0.87
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These Fermi-LAT observations upper bounds are obtained from [ref] .
Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data · The $γ$-ray flux calculations for the dwarf galaxies and their comparison with the observations · 0.87
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The mass density function $dn/dM(M,z)$ is written as [ref] , [equation] where $ρ_0, m$ is the matter density of the comoving background ($ρ_0, m=ρ_c Ω_m(1+z)^3$, $ρ_c$ is the critical density of the Universe), the ratio $ν= δ_c/σ(M)$ as discussed, where $δ_c$ ($≃1.686$, [ref] ) is the critical overdensity for spherical collapse and $σ^2(M)$ is the variance of density fluctuations of a sphere containing mass $M$ ($M ≃(4/3)πR^3 ρ_c (z_c)$ for collapse halos, $R$ being the comoving length and $z_c$ is the redshift at which the halo collapses).
Mass function of dark matter halos · Extragalactic $γ$-ray background and extragalactic $γ$-rays from dark matter annihilations · 0.81
Compares with 2 papers
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We then compare our results with those observed by Fermi-LAT [ref] .
The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data · Extragalactic $γ$-ray background and extragalactic $γ$-rays from dark matter annihilations · 0.95
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We then compare our results with those observed by Fermi-LAT [ref] .
The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV · Extragalactic $γ$-ray background and extragalactic $γ$-rays from dark matter annihilations · 0.95
Cites as support 1 paper
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It has been demonstrated [ref] that the WIMP dark matter component of this first model (describe later) satisfies these criteria along with the criteria for dark matter relic density given by Planck satellite borne experiment [ref] based on the observation and analysis of the anisotropies of Cosmic Microwave Background Radiation (CMBR).
Planck 2018 results. VI. Cosmological parameters · Introduction · 0.99
Cites as background 10 papers
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In this work, we consider a KK dark matter candidate in an extra dimensional model namely Universal Extra Dimensional model (UED) [ref] .
Bounds on Universal Extra Dimensions · Introduction · 0.91
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In this work, we consider a KK dark matter candidate in an extra dimensional model namely Universal Extra Dimensional model (UED) [ref] .
Is the Lightest Kaluza-Klein Particle a Viable Dark Matter Candidate? · Introduction · 0.91
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In this work, we consider a KK dark matter candidate in an extra dimensional model namely Universal Extra Dimensional model (UED) [ref] .
Kaluza-Klein Dark Matter · Introduction · 0.91
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