[Phys-seminars] 2017-06-21 Astrophysics and Cosmology Seminar

griv griv at bgu.ac.il
Sun Jun 18 14:19:47 IDT 2017


Astrophysics and Cosmology Seminar

 DATE: 21-06-17

 TIME: 11:15

 PLACE: Seminar Room 207, Building 54 (Physics)

TITLE: 
ICECUBE CONSTRAINTS ON THE FERMI BUBBLES

SPEAKER: 
Ms. Nimrod Sherf, Ben-Gurion University

ABSTRACT/COMMENTS: 
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 \\xi<8% upper limit on the cosmic-ray ion (CRI) acceleration efficiency, and an \\eta>0.006 lower limit on the electron-to-ion ratio of acceleration efficiencies (at the 2\\sigma confidence level). For typical \\xi, a signal should surface once the number of IceCube neutrinos increases by an order of magnitude, unless there is a cutoff on the CRI spectrum.


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