Search for dark matter signals towards a selection of recently-detected DES dwarf galaxy satellites of the Milky Way with H.E.S.S

Abstract

Dwarf spheroidal galaxy satellites of the Milky Way are prime targets for indirect detection of dark matter with gamma rays due to their proximity, high dark matter content and absence of non-thermal emission processes. Recently, the Dark Energy Survey (DES) revealed the existence of new ultra-faint dwarf spheroidal galaxies in the southern-hemisphere sky, therefore ideally located for ground-based observations with the imaging atmospheric Cherenkov telescope array H.E.S.S. We present a search for very-high-energy ($E\gtrsim 100$ GeV) gamma-ray emission using H.E.S.S. observations carried out recently towards Reticulum II, Tucana II, Tucana III, Tucana IV and Grus II satellites. No significant very-high-energy gamma-ray excess is found from the observations on any individual object nor in the combined analysis of all the datasets. Using the most recent modeling of the dark matter distribution in the dwarf galaxy halo, we compute for the first time on DES satellites individual and combined constraints from Cherenkov telescope observations on the annihilation cross section of dark matter particles in the form of Weakly Interacting Massive Particles. The combined 95% C.L. observed upper limits reach $⟨\sigma v⟩\simeq 1\times 10^{-23}$ cm${}^3$s${}^{-1}$ in the $W^{+}{W}^{-}$ channel and $4\times 10^{-26}$ cm${}^3$s${}^{-1}$ in the $\gamma \gamma$ channels for a dark matter mass of 1.5 TeV. The H.E.S.S. constraints well complement the results from Fermi-LAT, HAWC, MAGIC and VERITAS and are currently the most stringent in the $\gamma \gamma$ channels in the multi-GeV/multi-TeV mass range.

arXiv comment20 pages, 12 figures

References in corpus (46)

• The Seventh Data Release of the Sloan Digital Sky Survey
• Particle Dark Matter: Evidence, Candidates and Constraints
• Asymptotic formulae for likelihood-based tests of new physics
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• Observations of the Crab Nebula with H.E.S.S
• Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Background Modelling in Very-High-Energy gamma-ray Astronomy
• A high performance likelihood reconstruction of gamma-rays for Imaging Atmospheric Cherenkov Telescopes
• Updated Search for Spectral Lines from Galactic Dark Matter Interactions with Pass 8 Data from the Fermi Large Area Telescope
• Limits to dark matter annihilation cross-section from a combined analysis of MAGIC and Fermi-LAT observations of dwarf satellite galaxies
• A Monte Carlo Template based analysis for Air-Cherenkov Arrays
• Dwarf galaxy annihilation and decay emission profiles for dark matter experiments
• Dark matter annihilation and decay in dwarf spheroidal galaxies: The classical and ultrafaint dSphs
• The Minimal Model for Dark Matter and Unification
• Magellan/M2FS Spectroscopy of Tucana 2 and Grus 1
• Dark Matter Constraints from a Joint Analysis of Dwarf Spheroidal Galaxy Observations with VERITAS
• Nearest Neighbor: The Low-Mass Milky Way Satellite Tucana III
• Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies
• Triangulum II: Not Especially Dense After All
• Dark Matter Limits From Dwarf Spheroidal Galaxies with The HAWC Gamma-Ray Observatory
• Spherical Jeans analysis for dark matter indirect detection in dwarf spheroidal galaxies - Impact of physical parameters and triaxiality
• A Deeper Look at the New Milky Way Satellites: Sagittarius II, Reticulum II, Phoenix II, and Tucana III
• Magellan/M2FS Spectroscopy of the Reticulum 2 Dwarf Spheroidal Galaxy
• Simple J-Factors and D-Factors for Indirect Dark Matter Detection
• Scaling Relations for Dark Matter Annihilation and Decay Profiles in Dwarf Spheroidal Galaxies
• Dark matter annihilation and decay profiles for the Reticulum II dwarf spheroidal galaxy
• Search for gamma-ray emission from eight dwarf spheroidal galaxy candidates discovered in Year Two of Dark Energy Survey with Fermi-LAT data
• Searches for gamma-ray lines and `pure WIMP' spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S
• Precision Photon Spectra for Wino Annihilation
• Resummed Photon Spectra for WIMP Annihilation
• The discreet charm of higgsino dark matter - a pocket review
• Signatures from Scalar Dark Matter with a Vector-like Quark Mediator
• $Z$ boson mediated dark matter beyond the effective theory
• Simplified Dirac Dark Matter Models and Gamma-Ray Lines
• Contamination of stellar-kinematic samples and uncertainty about dark matter annihilation profiles in ultrafaint dwarf galaxies: the example of Segue I
• Robust velocity dispersion and binary population modeling of the ultra-faint dwarf galaxy Reticulum II
• On the sensitivity of CTA to gamma-ray boxes from multi-TeV dark matter
• Estimating the GeV Emission of Millisecond Pulsars in Dwarf Spheroidal Galaxies
• Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array
• Prospects for a Dark Matter annihilation signal towards the Sagittarius dwarf galaxy with ground based Cherenkov telescopes
• Comparing Galactic Center MSSM dark matter solutions to the Reticulum II gamma-ray data

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• Les Houches Lectures on Indirect Detection of Dark Matter
• Detection of extended gamma-ray emission around the Geminga pulsar with H.E.S.S
• Velocity-dependent J-factors for annihilation radiation from cosmological simulations
• Search for Ultraheavy Dark Matter from Observations of Dwarf Spheroidal Galaxies with VERITAS
• Search for dark matter annihilation in the dwarf irregular galaxy WLM with H.E.S.S
• Toward the ultimate reach of current imaging atmospheric Cherenkov telescopes and their sensitivity to TeV dark matter
• Dark Matter Line Searches with the Cherenkov Telescope Array
• TeV Dark Matter Searches in the Extragalactic Gamma-Ray Sky
• Constraints on dark matter annihilation and decay from the large-scale structure of the nearby universe
• Dark Matter and $(g-2{)}_{\mu ,e}$ in radiative Dirac neutrino mass models
• Sensitivity of the Cherenkov Telescope Array to dark subhalos
• Asymmetric accidental composite dark matter
• Galactic and Extragalactic Sources of Very High Energy Gamma-rays
• Multi-TeV dark matter density in the inner Milky Way halo: spectral and dynamical constraints
• Leptoquarks and Real Singlets: A Richer Scalar Sector Behind the Origin of Dark Matter
• Gamma-ray and Synchrotron Radiation from Dark Matter annihilations in Ultra-faint Dwarf Galaxies
• New dark matter analysis of Milky Way dwarf satellite galaxies with MADHATv2
• Dark matter indirect detection limits from complete annihilation patterns
• CTA Sensitivity on TeV scale Dark Matter Models with Complementary Limits from Direct Detection
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• Present and Future constraints on Secluded Dark Matter in the Galactic Halo with TeV Gamma-ray Observatories
• Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS
• Velocity-dependent J-factors for Milky Way dwarf spheroidal analogues in cosmological simulations
• Estimate of the Mass and Radial Profile of the Orphan-Chenab Stream's Dwarf Galaxy Progenitor Using MilkyWay@home
• The dark Stodolsky effect: constraining effective dark matter operators with spin-dependent interactions
• Electroweak Dark Matter
• Dark Matter and Fundamental Physics Searches with IACTs
• H.E.S.S.: The High Energy Stereoscopic System
• Limiting the Heavy-quark and Gluon-philic Real Dark Matter
• Search for gamma-ray spectral lines from dark matter annihilation with the H.E.S.S. Inner Galaxy Survey
• Magellan/IMACS spectroscopy of Grus I: A low metallicity ultra-faint dwarf galaxy