Speaker
Prof.
Anatoly Erlykin
(P.N.Lebedev Physical Institute)
Description
The dependence of the cosmic ray intensity on Galactocentric distance is known to be much less rapid than that of the thought-to-be sources: supernova remnants. This is an old problem ('the radial gradient problem') which has led to a number of possible 'scenarios'. Here, we use recent data on the supernova remnant's radial distribution and correlate it with measured HII electron temperature (T). We examined three models of the cosmic ray injection and acceleration and in all of them the injection efficiency increases with increasing ambient temperature T. The increase is expected to vary as a high power of T in view of the strong temperature dependence of the tail of the Maxwell-Boltzmann distribution of particle energies. Writing the efficience as proportional to T**n we find n~8.4. There is thus, yet another explanation of the radial gradient problem.
| Registration number following "ICRC2015-I/" | 1215 |
|---|---|
| Collaboration | -- not specified -- |
Primary author
Prof.
Anatoly Erlykin
(P.N.Lebedev Physical Institute)
Co-authors
Prof.
Arnold Wolfendale
(Physics Department, Durham University, Durham, UK)
Prof.
Vladimir Dogiel
(P.N.Lebedev Physical Institute, Moscow, Russia)
