CLUMPY : Jeans analysis,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si5.gif" display="inline" overflow="scroll"><mml:mi>γ</mml:mi></mml:math>-ray and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si59.gif" display="inline" overflow="scroll"><mml:mi>ν</mml:mi></mml:math>fluxes from dark matter (sub-)structures

Bonnivard, V.; Hütten, Moritz; Nezri, E.; Charbonnier, A.; Combet, C.; Maurin, D.

doi:10.1016/j.cpc.2015.11.012

Cited by 84 publications

(98 citation statements)

References 69 publications

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“…This will be particularly true as new dSphs continue to be discovered by the Dark Energy Survey [40], and even further into the future by the Large Synoptic Survey Telescope. Accounting for velocity-dependent cross sections will also be a future requirement of numerical methods that scan the theoretical parameter space given large spectroscopic data sets [41,42].…”

Section: Discussionmentioning

confidence: 99%

Sommerfeld-enhanced J -factors for dwarf spheroidal galaxies

2017

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For models in which dark matter annihilation is Sommerfeld-enhanced, the annihilation cross section increases at low relative velocities. Dwarf spheroidal galaxies (dSphs) have low characteristic dark matter particle velocities and are thus ideal candidates to study such models. In this paper we model the dark matter phase space of dSphs as isotropic and spherically-symmetric, and determine the J-factors for several of the most important targets for indirect dark matter searches. For Navarro-Frenk-White density profiles, we quantify the scatter in the J-factor arising from the astrophysical uncertainty in the dark matter potential. We show that, in Sommerfeld-enhanced models, the ordering of the most promising dSphs may be different relative to the standard case of velocity-independent cross sections. This result can have important implications for derived upper limits on the annihilation cross section, or on possible signals, from dSphs.

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Section: Discussionmentioning

confidence: 99%

Sommerfeld-enhanced J -factors for dwarf spheroidal galaxies

2017

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“…Having incorporated these models in the CLUMPY code [35][36][37], we consider 1000 Monte Carlo realisations for each configuration, and we select all subhaloes with J (< 0.1 • ) > 10 17 GeV 2 cm −5 . The choice of this cut originates from the specific scope of this paper: To show how many subhaloes would be detectable in the Fermi-LAT catalogues, and what is the role, if any, of low-mass subhaloes.…”

Section: Galactic Subhalo Modellingmentioning

confidence: 99%

Gamma-Ray Sensitivity to Dark Matter Subhalo Modelling at High Latitudes

2019

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Searches for "dark" subhaloes in gamma-ray point-like source catalogues are among promising strategies for indirect dark matter detection. Such a search is nevertheless affected by uncertainties related, on the one hand, to the modelling of the dark matter subhalo distribution in Milky-Way-like galaxies, and, on the other hand, to the sensitivity of gamma-ray instruments to the dark matter subhalo signals. In the present work, we assess the detectability of dark matter subhaloes in Fermi-LAT catalogues, taking into accounts uncertainties associated with the modelling of the Galactic subhalo population. We use four different halo models bracketing a large set of uncertainties. For each model, adopting an accurate detection threshold of the LAT to dark matter subhalo signals and comparing model predictions with the number of unassociated point-sources in Fermi-LAT catalogues, we derive upper limits on the annihilation cross section as a function of dark matter mass. Our results show that, even in the best-case scenario (i.e. DMonly subhalo model), which does not include tidal disruption from baryons, the limits on the dark matter parameter space are less stringent than current gamma-ray limits from dwarf spheroidal galaxies. Comparing the results obtained with the different subhalo models, we find that baryonic effects on the subhalo population are significant and lead to dark matter constraints that are less stringent by a factor of ∼2 to ∼5. This uncertainty comes from the unknown resilience of dark matter subhaloes to tidal disruption.

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“…For example, we do not include the contribution from subhalos in dSphs since it is still under discussion (e.g. [117,118,[133][134][135][136][137][138]). Subhalos should enhance the annihilation signal, although little subhalo boost is expected in dSphs.…”

Section: Resultsmentioning

confidence: 99%

“…More detailed profiles such as non-spherical cases or profiles with substructures are discussed in Ref. [78,[116][117][118]. Table I (5)), Jfactor integrated to solid angle of 0.5 degrees (J <0.5 • ), J-factor integrated to 4.0 • × 4.0 • region (J tot ) which corresponds to the size of the region of interest (RoI) in our analyses, and distance from the Earth.…”

Section: Burkert Profile [115]mentioning

confidence: 99%

Dependence of accessible dark matter annihilation cross sections on the density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope Array

2019

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Dwarf spheroidal galaxies are excellent targets in γ-ray searches for dark matter. We consider dark matter searches in dwarf spheroidal galaxies (dSphs) with the Cherenkov Telescope Array (CTA). The aim of this work is to reveal a quantitative and precise dependence of the accessible dark matter annihilation cross-sections on the dark matter density profiles of dSphs and on the distance to them. In most data analyses, researchers have assumed point-like signals from dSphs because it is difficult to resolve the expected emission profiles with current γ-ray observatories. In future however, CTA will be able to resolve the peak emission profiles in dSphs. We take several variations of the dark matter density profile of Draco dSph as examples and analyze the simulated observations of with CTA. We derive the accessible region of the dark matter annihilation crosssection with each dark matter density profile. The accessible region of the annihilation cross-section can differ by a factor of 10 among plausible profiles. We also examine the dependence on the distance to the target dSphs by assuming the same profiles of dSphs at different distances. Closer targets are better due to the higher J-factor, while their spatial extension significantly degrades our reach to the annihilation cross-section compared to the value expected from a simple distance-scaling of the J-factor. Spatial extension of the source affects the probable parameter region in energy-dependent ways. In some γ-ray energy ranges, this behaviour becomes moderately dependent on the properties of the observation facility.

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CLUMPY : Jeans analysis,γ-ray andνfluxes from dark matter (sub-)structures

Cited by 84 publications

References 69 publications

Sommerfeld-enhanced J -factors for dwarf spheroidal galaxies

Sommerfeld-enhanced J -factors for dwarf spheroidal galaxies

Gamma-Ray Sensitivity to Dark Matter Subhalo Modelling at High Latitudes

Dependence of accessible dark matter annihilation cross sections on the density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope Array

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