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 $\gamma$-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 $\gamma$-ray emission has been detected above 100 MeV from Triangulum-II. We derive the upper limits on $\gamma$-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.

It has been accepted for publication in JCAP. 12 pages, 4 tables, 7 figures

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Cited by in corpus (5)

• A Global Analysis of Dark Matter Signals from 27 Dwarf Spheroidal Galaxies using 11 Years of Fermi-LAT Observations
• TeV Dark Matter Searches in the Extragalactic Gamma-Ray Sky
• Stringent constraint on the radio signal from dark matter annihilation in dwarf spheroidal galaxies using the TGSS
• Analysis of Fermi-LAT data from Tucana-II: Possible constraints on the Dark Matter models with an intriguing hint of a signal
• Multiwavelength analysis of low surface brightness galaxies to study possible dark matter signature