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Draft version October 17, 2001 Preprint typeset using L A T E X style emulateapj v. 21/08/00

Summary: Draft version October 17, 2001
Preprint typeset using L A T E X style emulateapj v. 21/08/00
Kevork Abazajian 1 , George M. Fuller 1 , and Wallace H. Tucker 1,2
Draft version October 17, 2001
We point out a serendipitous link between warm dark matter (WDM) models for structure formation
on the one hand and the high sensitivity energy range (1-10 keV) for x-ray photon detection on the
Chandra and XMM-Newton observatories on the other. This fortuitous match may provide either a
direct detection of the dark matter or exclusion of many candidates. We estimate expected x-ray uxes
from eld galaxies and clusters of galaxies if the dark matter halos of these objects are composed of
WDM candidate particles with rest masses in the structure formation-preferred range (1 keV to 20
keV) and with small radiative decay branches. Existing observations lead us to conclude that for singlet
neutrinos (possessing a very small mixing with active neutrinos) to be a viable WDM candidate they
must have rest masses . 5 keV in the zero lepton number production mode. Future deeper observations
may detect or exclude the entire parameter range for the zero lepton number case, perhaps restricting
the viability of singlet neutrino WDM models to those where singlet production is driven by a signi cant
lepton number. The Constellation X project has the capability to detect/exclude singlet neutrino WDM
for lepton number values up to 10% of the photon number. We also consider di use x-ray background
constraints on these scenarios. These same x-ray observations additionally may constrain parameters of


Source: Abazajian, Kev - Theoretical Astrophysics, Fermilab


Collections: Physics