English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We performed a deep search for radio synchrotron emissions induced by weaklyinteracting massive particles (WIMPs) annihilation or decay in six dwarfspheroidal (dSph) galaxies of the Local Group. Observations were conducted withthe Australia Telescope Compact Array (ATCA) at 16 cm wavelength, with an rmssensitivity better than 0.05 mJy/beam in each field. In this work, we firstdiscuss the uncertainties associated with the modeling of the expected signal,such as the shape of the dark matter (DM) profile and the dSph magneticproperties. We then investigate the possibility that point-sources detected inthe proximity of the dSph optical center might be due to the emission from a DMcuspy profile. No evidence for an extended emission over a size of few arcmin(which is the DM halo size) has been detected. We present the associated boundson the WIMP parameter space for different annihilation/decay final states andfor different astrophysical assumptions. If the confinement of electrons andpositrons in the dSph is such that the majority of their power is radiatedwithin the dSph region, we obtain constraints on the WIMP annihilation ratewhich are well below the thermal value for masses up to few TeV. On the otherhand, for conservative assumptions on the dSph magnetic properties, the boundscan be dramatically relaxed. We show however that, within the next 10 years andregardless of the astrophysical assumptions, it will be possible toprogressively close in on the full parameter space of WIMPs by searching forradio signals in dSphs with SKA and its precursors.

Local Group dSph radio survey with ATCA (III): Constraints on Particle Dark Matter