Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...500l..37r&link_type=abstract
Astronomy and Astrophysics, Volume 500, Issue 2, 2009, pp.L37-L40
Astronomy and Astrophysics
Astrophysics
4
Cosmology: Dark Matter, X-Rays: General
Scientific paper
Context: The sterile neutrino is an excellent dark matter candidate, which can be searched for in a wide range of astrophysical sites. It has previously been shown that the optimal search strategy is to consider dwarf galaxies belonging to the Milky Way. Aims: We search for line emission from decaying dark matter. Methods: We analyse publicly available Chandra X-ray observations of the dwarf galaxy Draco. Results: The Draco and blank sky (background) spectra are nearly identical in shape, which allows us to conclude: i) dwarf spheroidals are ideal for studying dark matter X-ray emission since the baryonic noise is impressively low; ii) there is very little room for line emission, which leads to constraints in the mass-mixing angle parameter space of the sterile neutrino. We compare the standard flux derivation method to a very conservative rebinning approach. The resulting constraints are strongly dependent on the chosen method.
Hansen Steen H.
Riemer-Sørensen Signe
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