Strong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Center

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dc.contributor.authorAbazajian, Kevork N.en
dc.contributor.authorHoriuchi, Shunsakuen
dc.contributor.authorKaplinghat, Manojen
dc.contributor.authorKeeley, Ryan E.en
dc.contributor.authorMacias, Oscaren
dc.contributor.departmentCenter for Neutrino Physicsen
dc.contributor.departmentPhysicsen
dc.date.accessioned2020-12-16T13:29:40Zen
dc.date.available2020-12-16T13:29:40Zen
dc.date.issued2020-08-20en
dc.description.abstractThe extended excess toward the Galactic Center (GC) in gamma rays inferred from Fermi-LAT observations has been interpreted as being due to dark matter (DM) annihilation. Here, we perform new likelihood analyses of the GC and show that, when including templates for the stellar galactic and nuclear bulges, the GC shows no significant detection of a DM annihilation template, even after generous variations in the Galactic diffuse emission models and a wide range of DM halo profiles. We include Galactic diffuse emission models with combinations of three-dimensional inverse Compton maps, variations of interstellar gas maps, and a central source of electrons. For the DM profile, we include both spherical and ellipsoidal DM morphologies and a range of radial profiles from steep cusps to kiloparsec-sized cores, motivated in part by hydrodynamical simulations. Our derived upper limits on the dark matter annihilation flux place strong constraints on DM properties. In the case of the pure b-quark annihilation channel, our limits on the annihilation cross section are more stringent than those from the Milky Way dwarfs up to DM masses of approximately TeV and rule out the thermal relic cross section up to approximately 300 GeV. Better understanding of the DM profile, as well as the Fermi-LAT data at its highest energies, would further improve the sensitivity to DM properties.en
dc.description.notesWe are grateful to Troy Porter for his very helpful comments about GALPROP version 56 and for making the new 3D ISRF data publicly available. We thank Shin'ichiro Ando, Francesca Calore, Roland Crocker, Douglas Finkbeiner, Chris Gordon, Rebecca Leane, Mariangela Lisanti, Dmitry Malyshev, Shigeki Matsumoto, Nicholas L. Rodd, Satoshi Shirai, Tracy Slatyer, Masahiro Takada, and Christoph Weniger for fruitful discussions and feedback. K. N. A. and M. K. are supported by NSF Theoretical Physics Grants No. PHY-1620638 and PHY-1915005. S. H. is supported by the U.S. Department of Energy Office of Science under Award No. de-sc0018327 and NSF Grants No. AST-1908960 and PHY-1914409. O. M. acknowledges support by JSPS KAKENHI Grants No. JP17H04836, JP18H04340, JP18H04578, and JP20K14463. This work was supported by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan.en
dc.description.sponsorshipU.S. Department of Energy Office of ScienceUnited States Department of Energy (DOE) [de-sc0018327]; NSFNational Science Foundation (NSF) [AST-1908960, PHY-1914409, PHY-1620638, PHY-1915005]; JSPS KAKENHIMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research (KAKENHI) [JP17H04836, JP18H04340, JP18H04578, JP20K14463]; World Premier International Research Center Initiative (WPI Initiative), MEXT, JapanMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1103/PhysRevD.102.043012en
dc.identifier.eissn1550-2368en
dc.identifier.issn1550-7998en
dc.identifier.issue4en
dc.identifier.other43012en
dc.identifier.urihttp://hdl.handle.net/10919/101500en
dc.identifier.volume102en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleStrong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Centeren
dc.title.serialPhysical Review Den
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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