A new prescription for the random magnetic field of the Milky W ay
Year: 2015
Type: preprint
Abstract: We present a new prescription for the small-scale magnetic fi eld of the Milky Way and complement existing models for the total Galactic magnetic fiel d. In particular, we extend the random and striated magnetic field components of the Jansson & Farrar (JF12) model and investigate the characteristics of random magnetic fluctua tions. Thereby the small-scale magnetic field is modelled by Gaussian random fields using a rando m magnetic field power spectrum. We update the spatial distribution of Galactic cosmic ray electron density by a recent GALPROP model. We derive full-sky projections of the total and polarized sy nchrotron intensity as well as the Faraday rotation measure distribution of our model and compare to real data. We obtain good agreement to the WMAP7 22 GHz polarized and total intensity emission maps and we retrieve improved fits to Galactic foreground rotation me asure maps and power spectra of Oppermann et al. Our new prescription significantly compl ements previous models of the GMF and reveals implications for future studies on the deflec tion of ultra high energy cosmic rays (UHECR).
Source: arXiv (Cornell University)
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2129686283