Kavli Affiliate: Susan E. Clark
| First 5 Authors: Rodrigo Córdova Rosado, Brandon S. Hensley, Susan E. Clark, Adriaan J. Duivenvoorden, Zachary Atkins
| Summary:
We present a cross-correlation analysis between $1’$ resolution total
intensity and polarization observations from the Atacama Cosmology Telescope
(ACT) at 150 and 220 GHz and 15$”$ mid-infrared photometry from the Wide-field
Infrared Survey Explorer (WISE) over 107 12.5$^circtimes$12.5$^circ$ patches
of sky. We detect a spatially isotropic signal in the WISE$times$ACT $TT$
cross power spectrum at 30$sigma$ significance that we interpret as the
correlation between the cosmic infrared background at ACT frequencies and
polycyclic aromatic hydrocarbon (PAH) emission from galaxies in WISE, i.e., the
cosmic PAH background. Within the Milky Way, the Galactic dust $TT$ spectra are
generally well-described by power laws in $ell$ over the range 10$^3 < ell <
$10$^4$, but there is evidence both for variability in the power law index and
for non-power law behavior in some regions. We measure a positive correlation
between WISE total intensity and ACT $E$-mode polarization at 1000$ < ell
lesssim $6000 at $>$3$sigma$ in each of 35 distinct $sim$100 deg$^2$ regions
of the sky, suggesting alignment between Galactic density structures and the
local magnetic field persists to sub-parsec physical scales in these regions.
The distribution of $TE$ amplitudes in this $ell$ range across all 107 regions
is biased to positive values, while there is no evidence for such a bias in the
$TB$ spectra. This work constitutes the highest-$ell$ measurements of the
Galactic dust $TE$ spectrum to date and indicates that cross-correlation with
high-resolution mid-infrared measurements of dust emission is a promising tool
for constraining the spatial statistics of dust emission at millimeter
wavelengths.
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