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Searching for dark matter annihilation in recently discovered Milky Way satellites with Fermi-LAT

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Searching for dark matter annihilation in recently discovered Milky Way satellites with Fermi-LAT

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Título Searching for dark matter annihilation in recently discovered Milky Way satellites with Fermi-LAT
Autor Albert, Andrea
Anderson, Brandon
Bechtol, Keith
Drlica-Wagner, Alex
Meyer, Manuel
Sánchez-Conde, Miguel A.
Strigari, Louis E.
Wood, Matthew Dunseth
Abbott, Timothy M. C.
Abdalla, Filipe B.
Benoit-Lévy, Aurélien
Bernstein, Gary M.
Bernstein, Rebecca A.
Bertin, Emmanuel
Brooks, D.
Burke, David Lyle
Carnero Rosell, Aurelio
Carrasco Kind, Matías
Carretero Palacios, Jorge
Crocce, Martin
Cunha, Carlos Eduardo
D'Andrea, Christopher B.
Costa, Luiz N. da
Desai, S.
Diehl, H. Thomas
Dietrich, Jörg P.
Doel, Peter
Eifler, Tim
Evrard, August E.
Fausti Neto, Angelo
Finley, David A.
Flaugher, Brenna
Fosalba Vela, Pablo
Frieman, Joshua A.
Gerdes, David W.
Goldstein, Daniel Abraham
Gruen, Daniel
Gruendl, Robert A.
Honscheid, K.
James, David J.
Kent, Stephen M.
Kuehn, Kyler
Kuropatkin, Nikolay P.
Lahav, Ofer
Li, T. S.
Maia, Marcio Antonio Geimba
March, Marisa Cristina
Marshall, Jennifer L.
Martini, Paul
Miller, Christopher J.
Miquel, Ramon
Neilsen, Eric H.
Nord, Brian Dennis
Ogando, Ricardo L.C.
Plazas Malagón, Andrés Alejandro
Reil, Kevin
Romer, Anita K.
Rykoff, Eli
Sanchez-Alvaro, Eusebio
Santiago, Basilio Xavier
Schubnell, Michael
Sevilla Noarbe, Ignacio
Smith, Robert Christopher
Soares-Santos, Marcelle
Sobreira, Flávia
Suchyta, Eric
Swanson, Molly E. C.
Tarle, Gregory
Vikram, Vinu
Walker, Alistair
Wechsler, Risa H.
Fermi LAT Collaboration
DES Collaboration
Abstract We search for excess γ-ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years of data from the Fermi Large Area Telescope (LAT). Our sample of 45 stellar systems includes 28 kinematically confirmed dark-matter-dominated dwarf spheroidal galaxies (dSphs) and 17 recently discovered systems that have photometric characteristics consistent with the population of known dSphs. For each of these targets, the relative predicted γ-ray flux due to dark matter annihilation is taken from kinematic analysis if available, and estimated from a distance-based scaling relation otherwise, assuming that the stellar systems are DM-dominated dSphs. LAT data coincident with four of the newly discovered targets show a slight preference (each ~2σ local) for γ-ray emission in excess of the background. However, the ensemble of derived γ-ray flux upper limits for individual targets is consistent with the expectation from analyzing random blank-sky regions, and a combined analysis of the population of stellar systems yields no globally significant excess (global significance <1s). Our analysis has increased sensitivity compared to the analysis of 15 confirmed dSphs by Ackermann et al. The observed constraints on the DM annihilation cross section are statistically consistent with the background expectation, improving by a factor of ~2 for large DM masses (mDM,bb¯> 1 TeV and mDM,t+t-> 70 GeV) and weakening by a factor of ~1.5 at lower masses relative to previously observed limits.
Contido em The astrophysical journal. Bristol. Vol. 834, no. 2 (Jan. 2017), 110, 15 p.
Assunto Aglomerados globulares
Galáxias
Materia escura
Via láctea
[en] Dark matter
[en] Galaxies: dwarf
[en] Gamma rays: galaxies
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/165708
Arquivos Descrição Formato
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