Searching for Dark Matter in Messier 33
Enrico Borriello, Giuseppe Longo, Gennaro Miele, Maurizio Paolillo,, Beatriz B. Siffert, Fatemeh S. Tabatabaei, Rainer Beck

TL;DR
This paper introduces a novel radio observation method using Messier 33 to set bounds on dark matter properties, leveraging archival data and promising improvements with future high-resolution telescopes.
Contribution
It proposes a new approach to constrain dark matter annihilation parameters through radio continuum observations of Messier 33, especially focusing on a low emitting Radio Cavity.
Findings
Bounds comparable to Milky Way analysis from archival data
Potential to match five-year Fermi LAT bounds with high-resolution radio telescopes
Method can test dark matter origin of electrons and positrons observed by space telescopes
Abstract
Among various approaches for indirect detection of dark matter, synchrotron emission due to secondary electrons/positrons produced in galactic WIMPs annihilation is raising an increasing interest. In this paper we propose a new method to derive bounds in the mchi - <sigmaA*v> plane by using radio continuum observations of Messier 33, paying particular attention to a low emitting Radio Cavity. The comparison of the expected radio emission due to the galactic dark matter distribution with the observed one provides bounds which are comparable to those obtained from a similar analysis of the Milky Way. Remarkably, the present results are simply based on archival data and thus largely improvable by means of specifically tailored observations. The potentiality of the method compared with more standard searches is discussed by considering the optimistic situation of a vanishing flux (within…
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