Kavli Affiliate: Chao-Lin Kuo
| First 5 Authors: SPIDER Collaboration, P. A. R. Ade, M. Amiri, S. J. Benton, A. S. Bergman
| Summary:
Using data from the first flight of SPIDER and from Planck HFI, we probe the
properties of polarized emission from interstellar dust in the SPIDER observing
region. Component separation algorithms operating in both the spatial and
harmonic domains are applied to probe their consistency and to quantify
modeling errors associated with their assumptions. Analyses of diffuse Galactic
dust emission spanning the full SPIDER region demonstrate i) a spectral energy
distribution that is broadly consistent with a modified-blackbody (MBB) model
with a spectral index of $beta_mathrm{d}=1.45pm0.05$ $(1.47pm0.06)$ for $E$
($B$)-mode polarization, slightly lower than that reported by Planck for the
full sky; ii) an angular power spectrum broadly consistent with a power law;
and iii) no significant detection of line-of-sight polarization decorrelation.
Tests of several modeling uncertainties find only a modest impact (~10% in
$sigma_r$) on SPIDER’s sensitivity to the cosmological tensor-to-scalar ratio.
The size of the SPIDER region further allows for a statistically meaningful
analysis of the variation in foreground properties within it. Assuming a fixed
dust temperature $T_mathrm{d}=19.6$ K, an analysis of two independent
sub-regions of that field results in inferred values of
$beta_mathrm{d}=1.52pm0.06$ and $beta_mathrm{d}=1.09pm0.09$, which are
inconsistent at the $3.9,sigma$ level. Furthermore, a joint analysis of
SPIDER and Planck 217 and 353 GHz data within one sub-region is inconsistent
with a simple MBB at more than $3,sigma$, assuming a common morphology of
polarized dust emission over the full range of frequencies. This evidence of
variation may inform the component-separation approaches of future CMB
polarization experiments.
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