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Investigating the Milky Way's magnetism : a statistical analysis of the structural scales in polarized radio observations of our Galaxy. Stutz, Robert Adrian


Angular power spectra are calculated and presented for the entirety of the Canadian Galactic Plane Survey polarization dataset at 1.4 GHz. The data analyzed is a combination of data from the 100-m Effelsberg Telescope, the 26-m telescope at the Dominion Radio Astrophysical Observatory, and the Synthesis Telescope at the Dominion Radio Astrophysical Observatory, allowing all relevant scales to be sampled down to arcminute resolution. Calculated angular power spectra cover multipoles from ℓ ≈ 60 to ℓ ≈ 10⁴, and display at least three distinct regions within this range. A power-law region at low multipoles, a flattening region at intermediate multipoles, and a taper region at high multipoles necessitate a model fitting routine for analysis. Power-law indices are found to have a mode of 2.3, similar to other results, though slightly steeper. An increasing trend in power-law index is found with increasing latitude. A transition from small-scale to large-scale structure is evident at b = 10°. Flattening of the power spectra is also investigated and found to be likely due to background point sources, though this remains inconclusive.

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