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Weekly seminars
The Milky Way under a cosmic ray microscope
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Europe/Paris
Auditorium (LAPTh)
Auditorium
LAPTh
9, chemin de Bellevue
ANNECY
Description
The Galaxy is pervaded by a flux of high-energy, non-thermal particles:
cosmic rays. The last years have seen great progress towards elucidating
the century-old questions of cosmic ray origin. Yet, a number of
anomalies point to more comlex dynamics than previously thought. With
new and upcoming data, we are in a position to put some stress on the
standard picture of cosmic rays and address some of the fundamental
questions: What is the energy of transition from Galactic to
extra-Galactic sources? How is magnetised turbulence shaping the spectra
and anisotropies of cosmic rays? And what is the feedback of cosmic rays
on their environments?
In this talk, I will describe some of our recent works in that
direction. Diffuse emission in high-energy gamma-rays and neutrinos, as
measured by experiments like IceCube at the South Pole, is a great tool
for studying cosmic rays elsewhere in the Galaxy. We have recently
provided new predictions for gamma-rays and neutrinos, including
properly evaluated model uncertainties. I will address the need for
better gas maps and explain how we used Bayesian inference in producing
the highest resolution 3D maps of atomic and molecular hydrogen in the
Galaxy to date. Finally, I will also discuss the most recent hints of
non-homogeneous diffusion in the Galaxy and how this can be interpreted.
cosmic rays. The last years have seen great progress towards elucidating
the century-old questions of cosmic ray origin. Yet, a number of
anomalies point to more comlex dynamics than previously thought. With
new and upcoming data, we are in a position to put some stress on the
standard picture of cosmic rays and address some of the fundamental
questions: What is the energy of transition from Galactic to
extra-Galactic sources? How is magnetised turbulence shaping the spectra
and anisotropies of cosmic rays? And what is the feedback of cosmic rays
on their environments?
In this talk, I will describe some of our recent works in that
direction. Diffuse emission in high-energy gamma-rays and neutrinos, as
measured by experiments like IceCube at the South Pole, is a great tool
for studying cosmic rays elsewhere in the Galaxy. We have recently
provided new predictions for gamma-rays and neutrinos, including
properly evaluated model uncertainties. I will address the need for
better gas maps and explain how we used Bayesian inference in producing
the highest resolution 3D maps of atomic and molecular hydrogen in the
Galaxy to date. Finally, I will also discuss the most recent hints of
non-homogeneous diffusion in the Galaxy and how this can be interpreted.
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