Inverse Compton emission from millisecond pulsars in the Galactic bulge

Song, Deheng; Macias, Oscar; Horiuchi, Shunsaku

doi:10.1103/physrevd.99.123020

Inverse Compton emission from millisecond pulsars in the Galactic bulge

Journal Article · Tue Jun 25 00:00:00 EDT 2019 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.99.123020· OSTI ID:1612938

^[1]; Macias, Oscar ^[2]; Horiuchi, Shunsaku ^[3]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); DOE/OSTI
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Univ. of Tokyo, Chiba (Japan); Univ. of Amsterdam (The Netherlands)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Analyses of Fermi Gamma-Ray Space Telescope data have revealed a source of excess diffuse gamma rays towards the Galactic center that extends up to roughly ±20 degrees in latitude. The leading theory postulates that this GeV excess is the aggregate emission from a large number of faint millisecond pulsars (MSPs). The electrons and positrons (e^±) injected by this population could produce detectable inverse-Compton (IC) emissions by up-scattering ambient photons to gamma-ray energies. In this work, we calculate such IC emissions using galprop. A triaxial three-dimensional model of the bulge stars obtained from a fit to infrared data is used as a tracer of the putative MSP population. This model is compared against one in which the MSPs are spatially distributed as a Navarro-Frenk-White squared profile. We show that the resulting spectra for both models are indistinguishable, but that their spatial morphologies have salient recognizable features. Furthermore, the IC component above ~TeV energies carries information on the spatial morphology of the injected e^±. Such differences could potentially be used by future high-energy gamma-ray detectors such as the Cherenkov Telescope Array to provide a viable multiwavelength handle for the MSP origin of the GeV excess.

View Accepted Manuscript (DOE)

Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0018327

OSTI ID:: 1612938

Alternate ID(s):: OSTI ID: 1529408

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 12 Vol. 99; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Revival of the Dark Matter Hypothesis for the Galactic Center Gamma-Ray Excess Leane, Rebecca K.; Slatyer, Tracy R. Physical Review Letters, Vol. 123, Issue 24 https://doi.org/10.1103/physrevlett.123.241101	journal	December 2019

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