Search for gamma-ray emission from des dwarf spheroidal galaxy candidates with Fermi LAT data [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: Article numbers L4 : digital, PDF file
Additional Creators:: SLAC National Accelerator Laboratory, United States. Department of Energy, National Aeronautics and Space Administration Announcement, European Union, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

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. Here, 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 $\lesssim 20\;\mathrm{GeV}$ annihilating via the $b\bar{b}$ or τ⁺τ^-channels.

Report Numbers:

E 1.99:1354924

Subject(s):

Astronomy And Astrophysics

Other Subject(s):

Note:

Published through SciTech Connect.
08/04/2015.
The Astrophysical Journal. Letters 809 1 ISSN 2041-8213 AM
Drlica-Wagner, A.; Albert, A.; Bechtol, K.; Wood, M.; Strigari, L.; Sánchez-Conde, M.; Baldini, L.; Essig, R.; Cohen-Tanugi, J.; Anderson, B.; Bellazzini, R.; Bloom, E.; Caputo, R.; Cecchi, C.; Charles, E.; Chiang, J.; Angelis, A.; Funk, S.; Fusco, P.; Gargano, F.; Giglietto, N.; Giordano, F.; Guiriec, S.; Gustafsson, M.; Kuss, M.; et al.

Funding Information:

AC02-76SF00515
AC02-98CH10886
AYA2012-39559
ESP2013-4827
FPA2013-47986

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