What the Milky Way’s dwarfs tell us about the Galactic Center extended gamma-ray excess

Keeley, Ryan E.; Abazajian, Kevork N.; Kwa, Anna; Rodd, Nicholas L.; Safdi, Benjamin R.

doi:10.1103/physrevd.97.103007

Title: What the Milky Way’s dwarfs tell us about the Galactic Center extended gamma-ray excess

Journal Article · Thu May 10 00:00:00 EDT 2018 · Physical Review D

DOI:https://doi.org/10.1103/physrevd.97.103007· OSTI ID:1541170

Keeley, Ryan E. ^[1]; Abazajian, Kevork N. ^[1]; Kwa, Anna ^[1]; Rodd, Nicholas L. ^[2]; Safdi, Benjamin R. ^[3]

Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Theoretical Physics
Univ. of Michigan, Ann Arbor, MI (United States). Michigan Center for Theoretical Physics. Dept. of Physics

The Milky Way’s Galactic Center harbors a gamma-ray excess that is a candidate signal of annihilating dark matter. Dwarf galaxies remain predominantly dark in their expected commensurate emission. In this work we quantify the degree of consistency between these two observations through a joint likelihood analysis. In doing so we incorporate Milky Way dark matter halo profile uncertainties, as well as an accounting of diffuse gamma-ray emission uncertainties in dark matter annihilation models for the Galactic Center extended gamma-ray excess (GCE) detected by the Fermi Gamma-Ray Space Telescope. The preferred range of annihilation rates and masses expands when including these unknowns. Even so, using two recent determinations of the Milky Way halo’s local density leaves the GCE preferred region of single-channel dark matter annihilation models to be in strong tension with annihilation searches in combined dwarf galaxy analyses. A third, higher Milky Way density determination, alleviates this tension. Our joint likelihood analysis allows us to quantify this inconsistency. We provide a set of tools for testing dark matter annihilation models’ consistency within this combined data set. As an example, we test a representative inverse Compton sourced self-interacting dark matter model, which is consistent with both the GCE and dwarfs.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0013999; SC0012567; DESC00012567; DESC0013999

OSTI ID:: 1541170

Alternate ID(s):: OSTI ID: 1436829

Journal Information:: Physical Review D, Vol. 97, Issue 10; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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