High Energy Neutrinos via Heavy-Meson Synchrotron Emission in Strong Magnetic Fields

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High Energy Neutrinos via Heavy-Meson Synchrotron
Emission in Strong Magnetic Fields

• G. J. Mathews - Center for Astrophysics, UND T.
  Kajino, A. Tokuhisa, K. Kojima, NAOJ
• M, Famiano, WMU

TeV Particle Astrophysics Workshop, IHEP,
Beijing Sept. 24-28, 2008
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There are many astrophysical sites associated
with large magnetic fields
Pulsars, GRBs, Magnetars, AGNs, , etc.
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Such environments can lead to the acceleration of
Energetic Protons
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High energy protons precessing along magnetic
field lines emit synchrotron radiation
When a particle is accelerated in an external
field it can emit any quanta corresponding to the
interactions of the particle. Can emit
photons, gravitons, scalar mesons, vector mesons,

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Basic Idea
Meson Synchrotron Emission
Decay
Decay
TeV neutrinos
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Meson Synchrotron Emission
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Meson synchrotron emission can exceed photon
emision
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Meson Energy Spectra
?(1S)
??
Log(dI/dE) (s-1)
photon

• ??

Log(E) (eV)
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Meson Intensities
?(1S), ?(2S), ?(3S)
??
??
photon
Log(I) (eV s-1)
Log(?)
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?(1S) Meson Intensities
?(1S) meson
Log(I) (eV s-1)
?(1S) from protons
?(1S) from iron
Log(Etot)
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Cooling time by synchotron radiation
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? lepton flux
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?? spectrum from ?(1S) Decay
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?? spectrum from ?(1S) Decay
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There is a Signature of Neutrinos from Meson
Synchrotron Emission
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Event Rate
number of neutrinos produced per event
Detection efficiency Ahrens (2003)
Events detected
High energy synchrotron neutrinos from a SGR
burst might be detectable if relatively near by.
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Conclusions

• Some astrophysical objects with strong magnetic
  fields are viable sites for strong meson
  synchrotron radiation.
• This process can be more efficient than other
  processes for producing pions by high energy
  protons.
• A difference in the spectra between the ?, ?, and
  e- neutrinos could be a unique signature that
  meson synchrotron radiation has actually taken
  place.
• If a SGR burst occurs within 1 kpc, high energy
  neutrinos might be observable

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Why is the black hole so quiet?

• A supernova remnant has cleared out the accreting
  gas

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X-rays
Black Hole SgrA
10 light years
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Spinning Kerr Black Hole

• R 6 M 3 a2/R ? 8 a M/?R
• gt a 0.5

Wilson Mathews (2003)
a J/M2 1
a J/M2 0
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?? Meson Intensities
?? meson
?? from iron
?? from protons
Log(I) (eV s-1)
Log(Etot)
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?? Meson Intensities
?? meson
?? from iron
?? from protons
Log(I) (eV s-1)
Log(Etot)
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muon lepton spectrum