Spherical cows in dark matter indirect detection

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dc.contributor.authorBernal, Nicolas [UNESP]
dc.contributor.authorNecib, Lina
dc.contributor.authorSlatyer, Tracy R.
dc.contributor.institutionUniv Antonio Narino
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionMIT
dc.date.accessioned2018-11-26T17:24:20Z
dc.date.available2018-11-26T17:24:20Z
dc.date.issued2016-12-01
dc.description.abstractDark matter (DM) halos have long been known to be triaxial, but in studies of possible annihilation and decay signals they are often treated as approximately spherical. In this work, we examine the asymmetry of potential indirect detection signals of DM annihilation and decay, exploiting the large statistics of the hydrodynamic simulation Illustris. We carefully investigate the effects of the baryons on the sphericity of annihilation and decay signals for both the case where the observer is at 8.5 kpc from the center of the halo (exemplifi ed in the case of Milky Way- like halos), and for an observer situated well outside the halo. In the case of Galactic signals, we fi nd that both annihilation and decay signals are expected to be quite symmetric, with axis ratios very different from 1 occurring rarely. In the case of extragalactic signals, while decay signals are still preferentially spherical, the axis ratio for annihilation signals has a much flatter distribution, with elongated profiles appearing frequently. Many of these elongated profiles are due to large subhalos and/or recent mergers. Comparing to gamma- ray emission from the Milky Way and X- ray maps of clusters, we fi nd that the gamma- ray background appears less spherical/more elongated than the expected DM signal from the large majority of halos, and the Galactic gamma ray excess appears very spherical, while the X- ray data would be difficult to distinguish from a DM signal by elongation/sphericity measurements alone.en
dc.description.affiliationUniv Antonio Narino, Ctr Invest, Cra 3 Este 47A-15, Bogota, Colombia
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, ICTP South Amer Inst Fundamental Res, R Dr Bento Teobaldo Ferraz 271, BR-01140070 Sao Paulo, Brazil
dc.description.affiliationMIT, Ctr Theoret Phys, Cambridge, MA 02139 USA
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, ICTP South Amer Inst Fundamental Res, R Dr Bento Teobaldo Ferraz 271, BR-01140070 Sao Paulo, Brazil
dc.format.extent27
dc.identifierhttp://dx.doi.org/10.1088/1475-7516/2016/12/030
dc.identifier.citationJournal Of Cosmology And Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 12, 27 p., 2016.
dc.identifier.doi10.1088/1475-7516/2016/12/030
dc.identifier.fileWOS000398395400016.pdf
dc.identifier.issn1475-7516
dc.identifier.urihttp://hdl.handle.net/11449/162657
dc.identifier.wosWOS:000398395400016
dc.language.isoeng
dc.publisherIop Publishing Ltd
dc.relation.ispartofJournal Of Cosmology And Astroparticle Physics
dc.relation.ispartofsjr1,089
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectcosmological simulations
dc.subjectdark matter experiments
dc.subjectdark matter simulations
dc.titleSpherical cows in dark matter indirect detectionen
dc.typeArtigo
dcterms.licensehttp://iopscience.iop.org/page/copyright
dcterms.rightsHolderIop Publishing Ltd

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