GeV excess and phenomenological astrophysics modeling

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Huang, Xiaoyuan^1 ; Enßlin, Torsten^2,3,4 ; Selig, Marco^2,5

Physik-Department T30d, Technische Universität München, James-Franck-Straße, Garching

D-85748, Germany^1

Max-Planck-Institut für Astrophysik, Karl-Schwarzschildstr. 1, Garching

85748, Germany^2

Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, Munich

80539, Germany^3

Exzellenzcluster Universe, Technische Universität München, Boltzmannstr. 2, Garching

85748, Germany^4

IBM RandD GmbH, Schönaicher Straße 220, Böblingen

71032, Germany^5

关键词: Annihilation signals;    Cosmic ray interactions;    Galactic Center region;    Galactic disks;    Gamma-ray emission;    Interstellar mediums;    Morphological properties;    Spectral components;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/4/042029/pdf
DOI  :  10.1088/1742-6596/718/4/042029

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Predefined spatial templates to describe the background of γ-ray emission from astrophysical processes, like cosmic ray interactions, are used in previous searches for the γ-ray signatures of annihilating galactic dark matter. In this proceeding, we investigate the GeV excess in the inner Galaxy using an alternative approach, in which the astrophysical components are identified solely by their spectral and morphological properties. We confirm the reported GeV excess and derive related parameters for dark matter interpretation, which are consistent with previous results. We investigate the morphology of this spectral excess as preferred by the data only. This emission component exhibits a central Galaxy cusp as expected for a dark matter annihilation signal. However, Galactic disk regions with a morphology of that of the hot interstellar medium also host such a spectral component. This points to a possible astrophysical origin of the excess and requests a more detailed understanding of astrophysical γ-ray emitting processes in the galactic center region before definite claims about a dark matter annihilation signal can be made.