10-1088-20141-8205-809-1-L4.pdf.pdf (970.16 kB)
Search for gamma-ray emission from DES dwarf spheroidal galaxy candidates with Fermi-LAT data
journal contribution
posted on 2023-06-09, 01:55 authored by Kathy RomerKathy Romer, et al The DES Collaboration, et al The Fermi-LAT CollaborationDue 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.
Funding
Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1
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- Published
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- Published version
Journal
Astrophysical Journal LettersISSN
2041-8205Publisher
American Astronomical SocietyExternal DOI
Issue
1Volume
809Page range
L4Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-06-27First Open Access (FOA) Date
2016-06-27First Compliant Deposit (FCD) Date
2016-06-27Usage metrics
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