July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

The radial gradient of cosmic ray intensity in the Galaxy

Aug 1, 2015, 3:30 PM
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 180
Poster contribution CR-TH Poster 2 CR


Prof. Anatoly Erlykin (P.N.Lebedev Physical Institute)


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.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 1215

Primary author

Prof. Anatoly Erlykin (P.N.Lebedev Physical Institute)


Prof. Arnold Wolfendale (Physics Department, Durham University, Durham, UK) Prof. Vladimir Dogiel (P.N.Lebedev Physical Institute, Moscow, Russia)

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