The Dark Matter Annihilation Signal from Dwarf Galaxies and Subhalos
arXiv:0906.1822 · doi:10.1155/2010/162083
Abstract
Dark Matter annihilation holds great potential for directly probing the clumpiness of the Galactic halo that is one of the key predictions of the Cold Dark Matter paradigm of hierarchical structure formation. Here we review the gamma-ray signal arising from dark matter annihilation in the centers of Galactic subhalos. We consider both known Galactic dwarf satellite galaxies and dark clumps without a stellar component as potential sources. Utilizing the Via Lactea II numerical simulation, we estimate fluxes for 18 Galactic dwarf spheroidals with published central densities. The most promising source is Segue 1, followed by Ursa Major II, Ursa Minor, Draco, and Carina. We show that if any of the known Galactic satellites can be detected, then at least ten times more subhalos should be visible, with a significant fraction of them being dark clumps.
13 pages, 5 figures, invited review/tutorial paper (including some new results), submitted to Advances in Astronomy for the special edition "Dwarf Galaxy Cosmology", v2: added several references
References in corpus (32)
- Observation of an anomalous positron abundance in the cosmic radiation
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
- A Theory of Dark Matter
- The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
- Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
- Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
- Forming Disk Galaxies in Lambda CDM Simulations
- A common mass scale for satellite galaxies of the Milky Way
- Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function
- The Luminosity Function of the Milky Way Satellites
- Thin, thick and dark discs in LCDM
- A blueprint for detecting supersymmetric dark matter in the Galactic halo
- Significant Gamma Lines from Inert Higgs Dark Matter
- What mass are the smallest protohalos?
- Precise constraints on the dark matter content of Milky Way dwarf galaxies for gamma-ray experiments
- Dark matter subhalos and the dwarf satellites of the Milky Way
- The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST
- The Most Dark Matter Dominated Galaxies: Predicted Gamma-ray Signals from the Faintest Milky Way Dwarfs
- Cold Dark Matter Substructure and Galactic Disks II: Dynamical Effects of Hierarchical Satellite Accretion
- The shapes, orientation, and alignment of Galactic dark matter subhalos
- Exploring Halo Substructure with Giant Stars: The Dynamics and Metallicity of the Dwarf Spheroidal in Bootes
- Bounds on Cross-sections and Lifetimes for Dark Matter Annihilation and Decay into Charged Leptons from Gamma-ray Observations of Dwarf Galaxies
- Discovery of a Faint Old Stellar System at 150 kpc
- Exploring Dark Matter with Milky Way substructure
- Upper limit for gamma-ray emission above 140 GeV from the dwarf spheroidal galaxy Draco
- Anisotropy probe of galactic and extra-galactic Dark Matter annihilations
- Can Astrophysical Gamma Ray Sources Mimic Dark Matter Annihilation in Galactic Satellites?
- Cosmic ray lepton puzzle in the light of cosmological N-body simulations
- Proper motion of gamma-rays from microhalo sources
- Substructure Boosts to Dark Matter Annihilation from Sommerfeld Enhancement
- ATIC, PAMELA, HESS, Fermi and nearby Dark Matter subhalos
- Could the Fermi-LAT detect gamma-rays from dark matter annihilation in the dwarf galaxies of the Local Group?
Cited by in corpus (29)
- Gravitational probes of dark matter physics
- Infall Times for Milky Way Satellites From Their Present-Day Kinematics
- Dark Matter in the Milky Way's Dwarf Spheroidal Satellites
- Density Profiles of CDM Microhalos and their Implications for Annihilation Boost Factors
- Dark matter profiles and annihilation in dwarf spheroidal galaxies: prospectives for present and future gamma-ray observatories - I. The classical dSphs
- IceCube Search for Dark Matter Annihilation in nearby Galaxies and Galaxy Clusters
- The Globular Cluster - Dark Matter Halo Connection
- Variability and star formation in Leo T, the lowest luminosity star-forming galaxy known today
- Addressing the too big to fail problem with baryon physics and sterile neutrino dark matter
- Dark matter in the classical dwarf spheroidal galaxies: a robust constraint on the astrophysical factor for gamma-ray flux calculations
- Can multistate dark matter annihilation explain the high-energy cosmic ray lepton anomalies?
- Search for Gamma-Ray Lines towards Galaxy Clusters with the Fermi-LAT
- Leptonic dark matter annihilation in the evolving universe: constraints and implications
- Annihilation vs. Decay: Constraining dark matter properties from a gamma-ray detection
- Dark matter seeding and the kinematics and rotation of neutron stars
- Comprehensive Assessment of the Too-Big-to-Fail Problem
- gamma-rays from annihilating dark matter in galaxy clusters: stacking vs single source analysis
- Dark matter subhalos and unidentified sources in the Fermi 3FGL source catalog
- Predictably Missing Satellites: Subhalo Abundance in Milky Way-like Halos
- Fermi-LAT Sensitivity to Dark Matter Annihilation in Via Lactea II Substructure
- The Origin of Dark Matter Halo Profiles
- Re-Examining Astrophysical Constraints on the Dark Matter Model
- Dark Matter Halos from the Inside Out
- Prospects for Detecting Gamma Rays from Annihilating Dark Matter in Dwarf Galaxies in the Era of DES and LSST
- Gamma-ray and Synchrotron Radiation from Dark Matter annihilations in Ultra-faint Dwarf Galaxies
- Analysis of Fermi-LAT data from Tucana-II: Possible constraints on the Dark Matter models with an intriguing hint of a signal
- Numerical Simulations of the Dark Universe: State of the Art and the Next Decade
- A New Approach to Searching for Dark Matter Signals in Fermi-LAT Gamma Rays
- Broken Expectations: The Effects of Modelling Assumptions on the Inferred Dark Matter Distribution in the Milky Way's Satellites