Papers › Polarization fraction of Planck Galactic cold clumps and forecasts for the Simons Observatory
Polarization fraction of Planck Galactic cold clumps and forecasts for the Simons Observatory
J. Clancy, G. Puglisi, S. E. Clark, G. Coppi, G. Fabbian, C. Hervias-Caimapo, J. C. Hill, F. Nati, C. L. Reichardt
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We measure the polarization fraction of a sample of $6282$ Galactic cold clumps at 353 GHz, consisting of Planck Galactic cold clump (PGCC) catalogue category 1 objects (flux densities measured with signal-to-noise ratio (S/N) > 4). We find the mean-squared polarization fraction at 353 GHz to be ⟨Π² ⟩= [ 4.79 ±0.44 ] ×10 ⁻⁴ equating to an 11 σ detection of polarization. We test if the polarization fraction depends on the clumps' physical properties, including flux density, luminosity, Galactic latitude and physical distance. We see a trend towards increasing polarization fraction with increasing Galactic latitude, but find no evidence that polarization depends on the other tested properties. The Simons Observatory, with an angular resolution of order 1 arcmin and noise levels between $22$ and $54$ μ K-arcmin at high frequencies, will substantially enhance our ability to determine the magnetic field structure in Galactic cold clumps. At ≥5 σ significance, we predict the Simons Observatory will detect at least ∼12,000 cold clumps in intensity and ∼430 cold clumps in polarization. This number of polarization detections would represent a two orders of magnitude increase over the current Planck results. We also release software that can be used to mask these Galactic cold clumps in other analyses.
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