IceCube Constraints on the Fermi Bubbles

Nimrod Sherf; Uri Keshet; Ilya Gurwich

doi:10.3847/1538-4357/aa894f

IceCube Constraints on the Fermi Bubbles

Nimrod Sherf, Uri Keshet, Ilya Gurwich

Department of Physics

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Abstract

We analyze the IceCube four-year neutrino data in search of a signal from the Fermi bubbles. No signal is found from the bubbles or from their dense shell, even when taking into account the softer background. This imposes a conservative ξ_i < 8% upper limit on the cosmic-ray ion (CRI) acceleration efficiency, and an η ≡ ξ_e/ξ_i 0.006 lower limit on the electron-to-ion ratio of acceleration efficiencies (at the 2σ confidence level). For typical ξ_i, a signal should surface once the number of IceCube neutrinos increases by ∼an order of magnitude, unless there is a <PeV cutoff on the CRI spectrum.

Original language	English
Article number	95
Journal	Astrophysical Journal
Volume	847
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aa894f
State	Published - 1 Oct 2017

Keywords

Galaxy: center
acceleration of particles
cosmic rays
gamma rays: ISM
neutrinos

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/aa894f

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title = "IceCube Constraints on the Fermi Bubbles",

abstract = "We analyze the IceCube four-year neutrino data in search of a signal from the Fermi bubbles. No signal is found from the bubbles or from their dense shell, even when taking into account the softer background. This imposes a conservative ξi < 8% upper limit on the cosmic-ray ion (CRI) acceleration efficiency, and an η ≡ ξe/ξi 0.006 lower limit on the electron-to-ion ratio of acceleration efficiencies (at the 2σ confidence level). For typical ξi, a signal should surface once the number of IceCube neutrinos increases by ∼an order of magnitude, unless there is a ",

keywords = "Galaxy: center, acceleration of particles, cosmic rays, gamma rays: ISM, neutrinos",

author = "Nimrod Sherf and Uri Keshet and Ilya Gurwich",

note = "Funding Information: We thank N. K. Neilson, N. Whitehorn, E. Waxman, K. Murase, and K. Fang for helpful advice. This research was supported by the ISF within the ISF-UGC joint research program (grant No. 504/14) and by the GIF (grant I-1362-303.7/2016), and received funding from the IAEC-UPBC joint research foundation (grant 257). Publisher Copyright: {\textcopyright} 2017. The American Astronomical Society. All rights reserved..",

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AU - Gurwich, Ilya

N1 - Funding Information: We thank N. K. Neilson, N. Whitehorn, E. Waxman, K. Murase, and K. Fang for helpful advice. This research was supported by the ISF within the ISF-UGC joint research program (grant No. 504/14) and by the GIF (grant I-1362-303.7/2016), and received funding from the IAEC-UPBC joint research foundation (grant 257). Publisher Copyright: © 2017. The American Astronomical Society. All rights reserved..

PY - 2017/10/1

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N2 - We analyze the IceCube four-year neutrino data in search of a signal from the Fermi bubbles. No signal is found from the bubbles or from their dense shell, even when taking into account the softer background. This imposes a conservative ξi < 8% upper limit on the cosmic-ray ion (CRI) acceleration efficiency, and an η ≡ ξe/ξi 0.006 lower limit on the electron-to-ion ratio of acceleration efficiencies (at the 2σ confidence level). For typical ξi, a signal should surface once the number of IceCube neutrinos increases by ∼an order of magnitude, unless there is a

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KW - Galaxy: center

KW - acceleration of particles

KW - cosmic rays

KW - gamma rays: ISM

KW - neutrinos

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IceCube Constraints on the Fermi Bubbles

Abstract

Keywords

ASJC Scopus subject areas

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