Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope
Abstract
Triangulum-II, a newly discovered dwarf spheroidal galaxy, is a strong candidate for the indirect search of dark matter through the detection of γ-ray emission that could originate from the pair- annihilation of weakly interacting massive particles (WIMPs). We here report on the analysis of almost seven years Fermi Gamma-Ray Space Telescope data of Triangulum-II which was taken during its all sky survey operation mode. No excess γ-ray emission has been detected above 100 MeV from Triangulum-II. We derive the upper limits on γ-ray flux assuming both the power-law spectra and the spectra related to WIMP annihilation. In this work, we have considered several theoretical WIMP (neutralinos here) models envisioning both thermal and non-thermal production of WIMPs, and put limits on pair-annihilation cross section of WIMPs to constrain the parameter space related to those theoretical models.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- November 2017
- DOI:
- 10.1088/1475-7516/2017/11/003
- arXiv:
- arXiv:1705.00426
- Bibcode:
- 2017JCAP...11..003B
- Keywords:
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- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- It has been accepted for publication in JCAP. 12 pages, 4 tables, 7 figures