Constraints on sterile neutrino dark matter from XMM-Newton observations of M33
Paolillo, M.; Longo, G.; Borriello, E.; Miele, G.; Owen, R.
Italy, Germany, United Kingdom
Abstract
Using archival XMM-Newton observations of the diffuse and unresolved components' emission in the inner disc of M33, we exclude the possible contribution from narrow line emission in the energy range 0.5-5 keV more intense than 10-6-10-5 erg s-1. Under the hypothesis that sterile neutrinos constitute the majority of the dark matter in M33, we use this result in order to put constraints on their parameter space in the 1-10 keV mass range.