English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Context: The relation between Galactic cosmic-ray electrons, magnetic fieldsand synchrotron radiation. Aims: We exploit synchrotron radiation to constrainthe low-energy interstellar electron spectrum, using various radio surveys andconnecting with electron data from Fermi-LAT and other experiments. Methods:The GALPROP programme for cosmic-ray propagation, gamma-ray and synchrotronradiation is used. Secondary electrons and positrons are included. Propagationmodels based on cosmic-ray and gamma-ray data are tested against synchrotrondata from 22 MHz to 94 GHz. Results: The synchrotron data confirm the need fora low-energy break in the cosmic-ray electron injection spectrum. Theinterstellar spectrum below a few GeV has to be lower than standard modelspredict, and this suggests less solar modulation than usually assumed.Reacceleration models are more difficult to reconcile with the synchrotronconstraints. We show that secondary leptons are important for theinterpretation of synchrotron emission. We also consider a cosmic-raypropagation origin for the low-energy break. Conclusions: Exploiting thecomplementary information on cosmic rays and synchrotron gives unique andessential constraints on electrons, and has implications for gamma rays. Thisconnection is especially relevant now in view of the ongoing PLANCK and Fermimissions.

The interstellar cosmic-ray electron spectrum from synchrotron radiation and direct measurements