Fermi LAT search for internal bremsstrahlung signatures from dark matter annihilation

被引:323
作者
Bringmann, Torsten [1 ]
Huang, Xiaoyuan [2 ]
Ibarra, Alejandro [3 ]
Vogl, Stefan [3 ]
Weniger, Christoph [4 ]
机构
[1] Univ Hamburg, Inst Theoret Phys 2, DE-22761 Hamburg, Germany
[2] Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
[3] Tech Univ Munich, Phys Dept T30D, D-85748 Garching, Germany
[4] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
关键词
dark matter theory; dark matter experiments; gamma ray experiments; MISSING TRANSVERSE-MOMENTUM; LARGE-AREA TELESCOPE; NEUTRALINO ANNIHILATION; E(+)E(-) COLLISIONS; RADIATIVE PROCESSES; CONSTRAINT; DEGENERATE; PARTICLES; DETECTOR; DENSITY;
D O I
10.1088/1475-7516/2012/07/054
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A commonly encountered obstacle in indirect searches for galactic dark matter is how to disentangle possible signals from astrophysical backgrounds. Given that such signals are most likely subdominant, the search for pronounced spectral features plays a key role for indirect detection experiments; monochromatic gamma-ray lines or similar features related to internal bremsstrahlung, in particular, provide smoking gun signatures. We perform a dedicated search for the latter in the data taken by the Fermi gamma-ray space telescope during its first 43 months. To this end, we use a new adaptive procedure to select optimal target regions that takes into account both standard and contracted dark matter profiles. The behaviour of our statistical method is tested by a subsampling analysis of the full sky data and found to reproduce the theoretical expectations very well. The limits on the dark matter annihilation cross-section that we derive are stronger than what can be obtained from the observation of dwarf galaxies and, at least for the model considered here, collider searches. While these limits are still not quite strong enough to probe annihilation rates expected for thermally produced dark matter, future prospects to do so are very good. In fact, we already find a weak indication, with a significance of 3.1 sigma (4.3 sigma) when (not) taking into account the look-elsewhere effect, for an internal bremsstrahlung-like signal that would correspond to a dark matter mass of similar to 150GeV; the same signal is also well fitted by a gamma-ray line at around 130GeV. Although this would be a fascinating possibility, we caution that a much more dedicated analysis and additional data will be necessary to rule out or confirm this option.
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