Issue |
A&A
Volume 442, Number 3, November II 2005
|
|
---|---|---|
Page(s) | L45 - L48 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200500187 | |
Published online | 14 October 2005 |
Letter to the Editor
Diffuse galactic sub-MeV γ-ray excess from high-energy electrons
1
1 Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany e-mail: rsch@tp4.rub.de
2
Max-Planck-Institut für Extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
Received:
22
July
2005
Accepted:
11
September
2005
Recent INTEGRAL observations have confirmed the existence of diffuse sub-MeV radiation from the inner Galaxy. We propose a new explanation for the origin of this diffuse component in terms of electrostatic bremsstrahlung radiation from high-energy electrons. This electrostatic bremsstrahlung interpretation requires a very flat power law energy spectrum of high-energy electrons in the inner Galaxy which is reasonable if many point sources with significant spectral dispersion contribute to the injection of high-energy electrons in the Galaxy. The electrostatic bremsstrahlung interpretation avoids the enormous source power problem that previous explanations by radiation from low-energy electrons have.
Key words: cosmic ray electrons / diffuse galactic gamma rays / radiation processes
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.