PAMELA positron and electron spectra are reproduced by 3-dimensional cosmic-ray modeling

Дата и время публикации : 2013-11-21T21:03:15Z

Авторы публикации и институты :
Daniele Gaggero
Dario Grasso
Luca Maccione
Giuseppe Di Bernardo
Carmelo Evoli

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 4 pages, 3 figures. Prepared for submission to PRB : Rapid Communications. Some of the results are obtained with the DRAGON code (http://www.dragonproject.org)
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE

Краткий обзор статьи: The PAMELA collaboration recently released the $e^+$ absolute spectrum between 1 and 300 GeV in addition to the positron fraction and $e^-$ spectrum previously measured in the same time period. We use the newly developed 3-dimensional upgrade of the DRAGON code and the charge dependent solar modulation HelioProp code to consistently describe those data. We obtain very good fits of all data sets if a $e^+$ + $e^-$ hard extra-component peaked at 1 TeV is added to a softer $e^-$ background and the secondary $e^pm$ produced by the spallation of cosmic ray proton and helium nuclei. All sources are assumed to follow a realistic spiral arm spatial distribution. Remarkably, PAMELA data do not display any need of charge asymmetric extra-component. Finally, plain diffusion, or low re-acceleration, propagation models which are tuned against nuclear data, nicely describe PAMELA lepton data with no need to introduce a low energy break in the proton and Helium spectra.

Category: Physics