Decaying dark matter in the Draco dwarf galaxy

Riemer-Sorensen, S. and Hansen, S. H. (2009) Decaying dark matter in the Draco dwarf galaxy. Astronomy and Astrophysics, 500 2: L37-L40. doi:10.1051/0004-6361/200912430

Author Riemer-Sorensen, S.
Hansen, S. H.
Title Decaying dark matter in the Draco dwarf galaxy
Journal name Astronomy and Astrophysics   Check publisher's open access policy
ISSN 0004-6361
Publication date 2009-06
Sub-type Article (original research)
DOI 10.1051/0004-6361/200912430
Open Access Status DOI
Volume 500
Issue 2
Start page L37
End page L40
Total pages 4
Place of publication Les Ulis, France
Publisher EDP Sciences
Language eng
Formatted abstract
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. 
Keyword Cosmology: dark matter
X-rays: general
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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