Morphology of the Galactic dark matter synchrotron emission with self-consistent cosmic-ray diffusion models

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.063529· OSTI ID:21421136

Linden, Tim; Anderson, Brandon ^[1]; Profumo, Stefano ^[1]

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1. Department of Physics, University of California, 1156 High Street, Santa Cruz, California 95064 (United States)

A generic prediction in the paradigm of weakly interacting dark matter is the production of relativistic particles from dark matter pair annihilation in regions of high dark matter density. Ultrarelativistic electrons and positrons produced in the center of the Galaxy by dark matter annihilation should produce a diffuse synchrotron emission. While the spectral shape of the synchrotron dark matter haze depends on the particle model (and secondarily on the Galactic magnetic fields), the morphology of the haze depends primarily on (1) the dark matter density distribution, (2) the Galactic magnetic field morphology, and (3) the diffusion model for high-energy cosmic-ray leptons. Interestingly, an unidentified excess of microwave radiation with characteristics similar to those predicted by dark matter models has been claimed to exist near the Galactic center region in the data reported by the Wilkinson Microwave Anisotropy Probe (WMAP) satellite, and is dubbed the 'WMAP haze'. In this study, we carry out a self-consistent treatment of the variables enumerated above, enforcing constraints from the available data on cosmic rays, radio surveys, and diffuse gamma rays. We outline and make predictions for the general morphology and spectral features of a 'dark matter haze' and we compare them to the WMAP haze data. We also characterize and study the spectrum and spatial distribution of the inverse-Compton emission resulting from the same population of energetic electrons and positrons. We point out that the spectrum and morphology of the radio emission at different frequencies are powerful diagnostics to test whether a Galactic synchrotron haze indeed originates from dark matter annihilation.

• OSTI ID: 21421136
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 6; Other Information: DOI: 10.1103/PhysRevD.82.063529; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
ANNIHILATION
COSMIC POSITRONS
COSMIC RADIATION
EMISSION
FORECASTING
GALAXIES
GAMMA RADIATION
LEPTONS
MAGNETIC FIELDS
MICROWAVE RADIATION
NONLUMINOUS MATTER
PARTICLE MODELS
RELATIVISTIC RANGE
SPATIAL DISTRIBUTION
SPECTRA
SYNCHROTRON RADIATION
TAIL ELECTRONS
WEAK INTERACTIONS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
BREMSSTRAHLUNG
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
INTERACTIONS
IONIZING RADIATIONS
MATHEMATICAL MODELS
MATTER
PARTICLE INTERACTIONS
POSITRONS
RADIATIONS
SECONDARY COSMIC RADIATION