Radio constraints on dark matter annihilation in the galactic halo and its substructures

Journal Article · Thu Jan 15 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.023518· OSTI ID:21259791

Borriello, E ^[1]; Cuoco, A ^[2]; Miele, G ^[1]

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1. Dipartimento di Scienze Fisiche, Universita 'Federico II', Napoli (Italy) and INFN Sezione di Napoli (Italy)
2. Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, Bygn. 1520 8000 Aarhus Denmark (Denmark)

Annihilation of dark matter usually produces together with gamma rays comparable amounts of electrons and positrons. The e{sup +}e{sup -} gyrating in the galactic magnetic field then produce secondary synchrotron radiation which thus provides an indirect means to constrain the DM signal itself. To this purpose, we calculate the radio emission from the galactic halo as well as from its expected substructures and we then compare it with the measured diffuse radio background. We employ a multifrequency approach using data in the relevant frequency range 100 MHz-100 GHz, as well as the WMAP haze data at 23 GHz. The derived constraints are of the order <{sigma}{sub A}v>=10{sup -24} cm{sup 3} s{sup -1} for a DM mass m{sub {chi}}=100 GeV sensibly depending, however, on the astrophysical uncertainties, in particular, on the assumption of the galactic magnetic field model. The signal from single bright clumps is instead largely attenuated by diffusion effects and offers only poor detection perspectives.

• OSTI ID: 21259791
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 2; Other Information: DOI: 10.1103/PhysRevD.79.023518; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ASTROPHYSICS
COMPARATIVE EVALUATIONS
DETECTION
DIFFUSION
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
EMISSION
GALAXIES
GAMMA RADIATION
GEV RANGE 10-100
GHZ RANGE
MAGNETIC FIELDS
MASS
MHZ RANGE
NONLUMINOUS MATTER
POSITRONS
SIMULATION
SYNCHROTRON RADIATION