Galactic synchrotron emission with cosmic ray propagation models
By E. Orlando, A. Strong. 2013
137 citations recorded by the source corpus.
ABSTRACT Cosmic ray (CR) leptons produce radio synchrotron radiation by gyrating in inter-stellar magnetic fields (B-field). Details of B-fields, CR electron distributions andpropagation are still uncertain.We present developments in our modelling of Galactic radio emission with the GAL-PROP code. It now includes calculations of radio polarization, absorption and free-freeemission. Total and polarized synchrotron emission are investigated in the context ofphysical models of CR propagation. Predictions are compared with radio data from 22MHz to 2.3 GHz, and WilkinsonMicrowaveAnisotropyProbedata at 23 GHz. Spatialand spectral effects on the synchrotron modelling with different CR distribution, prop-agation halo size and CR propagation models are presented. We find that all-sky totalintensity and polarization maps are reasonably reproduced by including an anisotropicB-field, with comparable intensity to the regular one defined by rotation measures. Ahalo size of 10 kpc, which is larger than usually assumed, is favoured.This work provides a basis for further studies on foreground emission with the Plancksatellite and on interstellar gamma-ray emission with Fermi-Large Area Telescope.Key words: cosmic rays - ISM: magnetic fields - Galaxy: general - radi continuum:ISM.
Subfields: Electrical and Electronic Engineering, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/fd1b9000c398c01e1b5709f11f5f31b739c7ab5e
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In Electrical and Electronic Engineering
In Nuclear and High Energy Physics
- A. Strong
- E. Orlando
- Anna Franckowiak
- Troy A. Porter
- I. Grenier
- Nickolay Y. Gnedin
- J. Black
- Igor V. Moskalenko
Citations in the corpus
- THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV (2014, result): “The field strengths are in qualitative agreement with recent studies of the Galactic synchrotron emission in Orlando & Strong (2013), that take radio polarization into account.”
- DEVELOPMENT OF THE MODEL OF GALACTIC INTERSTELLAR EMISSION FOR STANDARD POINT-SOURCE ANALYSIS OF FERMI LARGE AREA TELESCOPE DATA (2016, background): “…between propagation code predictions and observations at various wavelengths (Strong et al. 2007, 2011; Bouchet et al. 2011; Gaggero et al. 2013; Orlando & Strong 2013), but our knowledge of the distribution of CR sources, of injection spectra, of CR diffusion properties, and of γ-ray…”
- SIMULATIONS OF DISK GALAXIES WITH COSMIC RAY DRIVEN GALACTIC WINDS (2013, background): “Codes that assume isotropic diffusion are able to predict CRemitted spectral data down to the few percent level (e.g Orlando & Strong 2013).”
- An improved source-subtracted and destriped 408 MHz all-sky map (2014, background): “E-mail:mathieu.remazeilles@manchester.ac.uk † E-mail:clive.dickinson@manchester.ac.uk 2003a; Finkbeiner 2004; Jaffe et al. 2011; Strong et al. 2011; Orlando & Strong 2013; Mertsch & Sarkar 2013), as well as Galactic sources such as supernova remnants (Sushch & Hnatyk 2014; Xiao & Zhu 2014) and HII…”
- Interpretation of AMS-02 electrons and positrons data (2014, background): “[180] and [181] as the result of an analysis based on synchrotron observations, thus completely independent from any detail concerning solar modulation.”
- The Nine Lives of Cosmic Rays in Galaxies (2015, methodology): “The study of Galactic synchrotron radiation was extended to full-sky spatial distribution and polarization data by Orlando & Strong (2013), Sun et al. (2008) using a range of magnetic field models from the literature.”