Search for gamma-ray emission from DES dwarf spheroidal galaxy candidates with Fermi-LAT data

Romer, Kathy, The DES Collaboration, et al and The Fermi-LAT Collaboration, et al (2015) Search for gamma-ray emission from DES dwarf spheroidal galaxy candidates with Fermi-LAT data. Astrophysical Journal Letters, 809 (1). L4. ISSN 2041-8205

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Due to their proximity, high dark-matter (DM) content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection of DM. Recently, eight new dSph candidates were discovered using the first year of data from the Dark Energy Survey (DES). We searched for gamma-ray emission coincident with the positions of these new objects in six years of Fermi Large Area Telescope data. We found no significant excesses of gamma-ray emission. Under the assumption that the DES candidates are dSphs with DM halo properties similar to the known dSphs, we computed individual and combined limits on the velocity-averaged DM annihilation cross section for these new targets. If the estimated DM content of these dSph candidates is confirmed, they will constrain the annihilation cross section to lie below the thermal relic cross section for DM particles with masses ≲ 20 {GeV} annihilating via the b\bar{b} or tau+tau- channels.

Item Type: Article
Keywords: dark matter – galaxies: dwarf – gamma rays: galaxies – Local Group
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Richard Chambers
Date Deposited: 27 Jun 2016 14:28
Last Modified: 07 Mar 2017 12:15

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Project NameSussex Project NumberFunderFunder Ref
Astrophysics and Cosmology - Sussex Consolidated GrantG1291STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/L000652/1