Dust Polarization Maps from TIGRESS: E/B Power Asymmetry and TE Correlation

Journal Article · 31 July 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab29f2 · OSTI ID:1611243

Kim, Chang-Goo  ^[1]; Choi, Steve K. ^[2]; Flauger, Raphael ^[3]

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1. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; Flatiron Inst., New York, NY (United States). Center for Computational Astrophysics
2. Cornell University, Ithaca, NY (United States); Princeton Univ., NJ (United States). Joseph Henry Lab. of Physics
3. Univ. of California, San Diego, CA (United States)

We present the first large set of all-sky synthetic dust polarization maps derived directly from a self-consistent magnetohydrodynamics simulation using the TIGRESS framework. Turbulence in this simulation is predominantly driven by supernova explosions, with rates that are self-consistently regulated by feedback loops. The simulation covers both the outer scale and inertial range of turbulence with uniformly high resolution. The shearing-box utilized in the simulation, in concert with resolved supernova-driven turbulence, enables the capturing of generation, growth, and saturation of both turbulent and mean magnetic fields. We construct polarization maps at 353 GHz, as seen by observers inside a model of the multiphase, turbulent, magnetized interstellar medium (ISM). To fully sample the simulated ISM state, we use 350 snapshots spanning over $$\sim 350\,\mathrm{Myr}$$ (more than six feedback loops) and nine representative observers. The synthetic skies show a prevalent E/B power asymmetry ($${EE}\gt {BB}$$) and positive TE correlation in broad agreement with observations by the Planck satellite. However, the ranges of $${EE}/{BB}\sim 1.4\mbox{-}1.7$$ and $${TE}/{({TT}\cdot {EE})}^{1/2}\sim 0.2\mbox{-}0.3$$ are generally lower than those measured by Planck. We find large fluctuations of E/B asymmetry and TE correlation depending on the observer's position and temporal fluctuations of ISM properties due to bursts of star formation. The synthetic maps are made publicly available to provide novel models of the microwave sky.

• Research Organization: Univ. of California, San Diego, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); Alfred P. Sloan Foundation
• Grant/Contract Number: SC0009919; 80NSSC18K0561; NNX17AG26G; NNH17ZDA001N-TCAN
• OSTI ID: 1611243
• Journal Information: The Astrophysical Journal (Online), Vol. 880, Issue 2; ISSN 1538-4357
• Publisher: Institute of Physics (IOP)Copyright Statement
• Country of Publication: United States
• Language: English