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Polarization Angular Spectra of Galactic Synchrotron Emission on Arcminute Scales
journal contributionposted on 2023-05-16, 19:45 authored by Tucci, M, Carretti, E, Cecchini, S, Nicastro, L, Fabbri, R, Gaensler, BM, John DickeyJohn Dickey, McClure-Griffiths, NM
We study the angular power spectra of the polarized component of the Galactic synchrotron emission in the 28 deg2 test region of the Southern Galactic Plane Survey at 1.4 GHz. These data were obtained by the Australia Telescope Compact Array and allow us to investigate angular power spectra down to arcminute scales. We find that, at this frequency, the polarization spectra for E- and B-modes seem to be affected by Faraday rotation produced in compact foreground screens. A different behavior is shown by the angular spectrum of the polarized intensity PI = (Q2 + U 2)1/2. This is well fitted by a power law (C PIâ„“ âˆ â„“-Î±PI) with slope âˆ¼1.7, which agrees with higher frequency results and can probably be more confidently extrapolated to the cosmological window.
Publication titleThe Astrophysical Journal
Department/SchoolSchool of Natural Sciences
PublisherUniversity of Chicago Press
Place of publicationChicago, USA