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Title: Updated galactic radio constraints on Dark Matter

Abstract

We perform a detailed analysis of the synchrotron signals produced by dark matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and dark matter properties. We then confront these signals with radio and microwave maps, including PLANCK measurements, from a frequency of 22 MHz up to 70 GHz. We derive two sets of constraints: conservative and progressive, the latter based on a modeling of the astrophysical emission. Radio and microwave constraints are complementary to those obtained with other indirect detection methods, especially for dark matter annihilating into leptonic channels.

Authors:
 [1];  [2]
  1. Laboratoire de Physique Théorique et Hautes Energies (LPTHE),UMR 7589 CNRS & UPMC, 4 Place Jussieu, Paris, F-75252 (France)
  2. Instituto de Física Teórica (IFT) UAM/CSIC,calle Nicolás Cabrera 13-15, Cantoblanco, Madrid, 28049 (Spain)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22572122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 07; Other Information: PUBLISHER-ID: JCAP07(2016)041; OAI: oai:repo.scoap3.org:16559; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ASTROPHYSICS; COSMIC ELECTRONS; COSMIC POSITRONS; COSMIC RADIO SOURCES; GALAXIES; GHZ RANGE 01-100; INTERSTELLAR MAGNETIC FIELDS; LIMITING VALUES; MHZ RANGE 01-100; NONLUMINOUS MATTER; RELICT RADIATION; SPACE VEHICLES; SYNCHROTRON RADIATION

Citation Formats

Cirelli, Marco, and Taoso, Marco. Updated galactic radio constraints on Dark Matter. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/07/041.
Cirelli, Marco, & Taoso, Marco. Updated galactic radio constraints on Dark Matter. United States. doi:10.1088/1475-7516/2016/07/041.
Cirelli, Marco, and Taoso, Marco. 2016. "Updated galactic radio constraints on Dark Matter". United States. doi:10.1088/1475-7516/2016/07/041.
@article{osti_22572122,
title = {Updated galactic radio constraints on Dark Matter},
author = {Cirelli, Marco and Taoso, Marco},
abstractNote = {We perform a detailed analysis of the synchrotron signals produced by dark matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and dark matter properties. We then confront these signals with radio and microwave maps, including PLANCK measurements, from a frequency of 22 MHz up to 70 GHz. We derive two sets of constraints: conservative and progressive, the latter based on a modeling of the astrophysical emission. Radio and microwave constraints are complementary to those obtained with other indirect detection methods, especially for dark matter annihilating into leptonic channels.},
doi = {10.1088/1475-7516/2016/07/041},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2016,
place = {United States},
year = 2016,
month = 7
}
  • Utilizing an exhaustive set of simplified models, we revisit dark matter scenarios potentially capable of generating the observed Galactic Center gamma-ray excess, updating constraints from the LUX and PandaX-II experiments, as well as from the LHC and other colliders. We identify a variety of pseudoscalar mediated models that remain consistent with all constraints. In contrast, dark matter candidates which annihilate through a spin-1 mediator are ruled out by direct detection constraints unless the mass of the mediator is near an annihilation resonance, or the mediator has a purely vector coupling to the dark matter and a purely axial coupling tomore » Standard Model fermions. Furthermore, all scenarios in which the dark matter annihilates through t-channel processes are now ruled out by a combination of the constraints from LUX/PandaX-II and the LHC.« less
  • 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 derivedmore » 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.« less
  • We determine upper limits on the dark matter (DM) self-annihilation cross section for scenarios in which annihilation leads to the production of electron--positron pairs. In the Galactic center, relativistic electrons and positrons produce a radio flux via synchroton emission, and a gamma-ray flux via bremsstrahlung and inverse Compton scattering. On the basis of archival, interferometric and single-dish radio data, we have determined the radio spectrum of an elliptical region around the Galactic center of extent 3 deg. semimajor axis (along the Galactic plane) and 1 deg. semiminor axis and a second, rectangular region, also centered on the Galactic center, ofmore » extent 1.6 deg. x 0.6 deg. The radio spectra of both regions are nonthermal over the range of frequencies for which we have data: 74 MHz-10 GHz. We also consider gamma-ray data covering the same region from the EGRET instrument (about GeV) and from HESS (around TeV). We show how the combination of these data can be used to place robust constraints on DM annihilation scenarios, in a way which is relatively insensitive to assumptions about the magnetic field amplitude in this region. Our results are approximately an order of magnitude more constraining than existing Galactic center radio and gamma-ray limits. For a DM mass of m{sub {chi}=}10 GeV, and an Navarro-Frank-White profile, we find <{sigma}{sub A}v>{<=}fewx10{sup -25} cm{sup 3} s{sup -1}.« less
  • 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 mean 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 multi-frequency approach using data in the relevant frequency range 100 MHz-100 GHz, as well as the WMAP Haze data at 23 GHz. The derivedmore » constraints are of the order <{sigma}{sub A}{sup v}> = 10{sup -24} cm{sup 3}s{sup -1} for a DM mass m{sub {kappa}}= 100 GeV even though sensibly depending on the astrophysical uncertainties.« less