Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope. Issue 11 (6th November 2017)

• Record Type: Journal Article
• Authors: Biswas, Sayan; Bhattacharjee, Pooja; Majumdar, Pratik; Das, Subinoy; Das, Mousumi; Joarder, Partha S.
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2017:Issue 11(2017)
• Page Start: 003
• Page End: 003
• Publication Date: 2017-11-06
• Subjects: dark matter theory -- dwarfs galaxies -- gamma ray experiments; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2017/11/003
• Languages: English
• ISSNs: 1475-7516

Abstract

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.