Statistical properties of galactic CMB foregrounds: dust and synchrotron

Autor:	Kandel, D., Lazarian, A., Pogosyan, D.
Rok vydání:	2017
Předmět:	Astrophysics - Astrophysics of Galaxies Astrophysics - Cosmology and Nongalactic Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1093/mnras/sty1115
Popis:	Recent Planck observations have revealed some of the important statistical properties of synchrotron and dust polarisation, namely, the $B$ to $E$ mode power and temperature-$E$ (TE) mode cross-correlation. In this paper, we extend our analysis in Kandel et al. (2017) that studied $B$ to $E$ mode power ratio for polarised dust emission to include TE cross-correlation and develop an analogous formalism for synchrotron signal, all using a realistic model of magnetohydrodynamical (MHD) turbulence. Our results suggest that the Planck results for both synchrotron and dust polarisation can be understood if the turbulence in the Galaxy is sufficiently sub-Alfv\'enic. We also show how $B$ to $E$ ratio as well as the TE cross-correlation can be used to study media magnetisation, compressibility, and level of density-magnetic field correlation. Comment: 11 pages, 4 figures, Submitted to MNRAS
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1711.03161 Zobrazit plný text záznamu View this record from Arxiv