theory working group report. 1 st - day report. we had two presentations on two related, basic...
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Theory working group Report
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1St - day report.
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We had two presentations on two related, basic topics by Hillas and Ptuskin. The goal in both was to exhibit the basic simplicity and generality of the results.– Hillas: the power input into galactic C.R.– Ptuskin: The anisotropy determined from
observations of grammage and basic galactic parameters.
We also added to our shopping list of simple problems.
2nd – day report
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We had a presentation by Peter Biermann.
We would like this and the two previous presentations to appear in the workshop volume as the contribution of the theory working group.
3rd – day report
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Global fits to cosmic-ray spectrum
Theory working group
Question 8: How many sources to explain the spectrum?
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Three classes of sourcesPresenter at this conference
A (Rc,PV)
B Extra- galactic
Power
+ 1 m requiredAtoyan Galactic GRB ? ? ?Berezinsky 2.5 None if
Ec = 0.3 PeV 2.7 0 3.5 x 1046
erg/Mpc3/yr, for Ec = 1 PeV
Bergman - - 2.4 4 ?Biermann - Wolf-Rayet SNR ? ? ?Hillas 3 SNII into slow
wind 2.3 3 ?
Hörandel 4 UH nuclei - - -
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Comments
• Simplest solution is to have two components, galactic and extra-galactic– Generally, A and B are different populations of
galactic sources
• KASCADE “preliminary” result has been very influential this week – showing a “Peter’s Cycle” structure of the knee.