2013
DOI: 10.1088/1475-7516/2013/11/035
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Bremsstrahlung gamma rays from light dark matter

Abstract: We discuss the often-neglected role of bremsstrahlung processes on the interstellar gas in computing indirect signatures of Dark Matter (DM) annihilation in the Galaxy, particularly for light DM candidates in the phenomenologically interesting O(10) GeV mass range. Especially from directions close to the Galactic Plane, the γ-ray spectrum is altered via two effects: directly, by the photons emitted in the bremsstrahlung process by energetic electrons which are among the DM annihilation byproducts; indirectly, … Show more

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Cited by 42 publications
(67 citation statements)
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References 70 publications
(104 reference statements)
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“…Lowering n ISRF would enhance the electron flux, but deplete the emissivity (and vice versa), with the two effects mostly compensating. This was explicitly seen with the analogous case for bremsstrahlung in [15]. Additionally, we shall illustrate the consequences of variation in the parameters on the different spectra.…”
Section: Formalismmentioning
confidence: 67%
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“…Lowering n ISRF would enhance the electron flux, but deplete the emissivity (and vice versa), with the two effects mostly compensating. This was explicitly seen with the analogous case for bremsstrahlung in [15]. Additionally, we shall illustrate the consequences of variation in the parameters on the different spectra.…”
Section: Formalismmentioning
confidence: 67%
“…We also calculated the bremsstrahlung gamma-ray emission from this population of electrons, following [15] and adopting gas densities as implemented in the GALPROP code (see Fig. 2 of [15]).…”
Section: Resultsmentioning
confidence: 99%
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“…4 For annihilations into leptons, secondary γ-ray emission via IC processes is neglected. Note that for DM masses 10 GeV, IC photons are mainly produced at energies < 1 GeV [60,61].…”
Section: Comparison With Other Searchesmentioning
confidence: 99%
“…Our constraints can therefore be applied to generic DM candidates with a mass in the multi-TeV range which annihilate into gauge bosons. This section is based on the results in [4]. We stress the often-neglected role of bremsstrahlung processes on the interstellar gas in computing indirect signatures of DM annihilation in the Galaxy,…”
Section: Testing Pure Wimp Multi-tev Dm Models With High Energy Gammamentioning
confidence: 99%