TY - JOUR
T1 - The Atacama Cosmology Telescope
T2 - Galactic Dust Structure and the Cosmic PAH Background in Cross-correlation with WISE
AU - Córdova Rosado, Rodrigo
AU - Hensley, Brandon S.
AU - Clark, Susan E.
AU - Duivenvoorden, Adriaan J.
AU - Atkins, Zachary
AU - Battistelli, Elia Stefano
AU - Choi, Steve K.
AU - Dunkley, Jo
AU - Hervías-Caimapo, Carlos
AU - Li, Zack
AU - Louis, Thibaut
AU - Naess, Sigurd
AU - Page, Lyman A.
AU - Partridge, Bruce
AU - Sifón, Cristóbal
AU - Staggs, Suzanne T.
AU - Vargas, Cristian
AU - Wollack, Edward J.
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - 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 × 12.°5 patches of sky. We detect a spatially isotropic signal in the WISE×ACT TT cross-power spectrum at 30σ 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 ℓ over the range 103 < ℓ < 104, 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 < ℓ ≲ 6000 at >3σ in each of 35 distinct ∼100 deg2 regions of the sky, suggesting that alignment between Galactic density structures and the local magnetic field persists to subparsec physical scales in these regions. The distribution of TE amplitudes in this ℓ 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-ℓ 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.
AB - 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 × 12.°5 patches of sky. We detect a spatially isotropic signal in the WISE×ACT TT cross-power spectrum at 30σ 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 ℓ over the range 103 < ℓ < 104, 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 < ℓ ≲ 6000 at >3σ in each of 35 distinct ∼100 deg2 regions of the sky, suggesting that alignment between Galactic density structures and the local magnetic field persists to subparsec physical scales in these regions. The distribution of TE amplitudes in this ℓ 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-ℓ 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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U2 - 10.3847/1538-4357/ad05cd
DO - 10.3847/1538-4357/ad05cd
M3 - Article
AN - SCOPUS:85182365987
SN - 0004-637X
VL - 960
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 96
ER -