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Dust Polarization From Starlight Data | | Pablo Fosalba
; Alex Lazarian
; Simon Prunet
; Jan A. Tauber
; | | Date: |
13 Nov 2001 | | Subject: | astro-ph | | Affiliation: | IAP), Alex Lazarian (Wisconsin), Simon Prunet (CITA), Jan A. Tauber (ESA-ESTEC | | Abstract: | We present a statistical analysis of the interstellar medium (ISM) polarization from the largest compilation available of starlight data, which comprises ~ 5500 stars. The measured correlation between the mean polarization degree and extinction indicates that ISM dust grains are not fully aligned with the uniform component of the large-scale Galactic magnetic field. Moreover, we estimate the ratio of the uniform to the random plane-of-the-sky components of the magnetic field to be B_u/B_r = 0.8. From the analysis of starlight polarization degree and position angle we find that the magnetic field broadly follows Galactic structures on large-scales. On the other hand, the angular power spectrum C_l of the polarization degree for Galactic plane data is found to be consistent with a power-law, C_l ~ l^{-1.5} (where l = 180 deg/ heta is the multipole order), for angular scales heta > 10 arcmin. We argue that this data set can be used to estimate diffuse polarized emission at microwave frequencies. | | Source: | arXiv, astro-ph/0111253 | | Services: | Forum | Review | PDF | Favorites | |
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