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- W4380558666 abstract "Optical starlight can be partially polarized while propagating through the dusty, magnetized interstellar medium. The polarization efficiency describes the polarization intensity fraction per reddening unit, P$_V$/E($B-V$), related to the interstellar dust grains and magnetic field properties. The maximum value observed, [P$_V$/E$(B-V)]_{max}$, is thus achieved under optimal polarizing conditions of the interstellar medium. Therefore, the analysis of polarization efficiency observations across the Galaxy contributes to the study of magnetic field topology, small-scale magnetic fluctuations, grain-alignment efficiency, and composition. Infrared observations from $Planck$ satellite have set [P$_V$/E$(B-V)]_{max}$ to 13$%$ mag$^{-1}$. However, recent optical polarization observations in $Planck$'s highly polarized regions showed polarization efficiency values between 13.6$%$ mag$^{-1}$ and 18.2$%$ mag$^{-1}$ (depending on the extinction map used), indicating that [P$_V$/E$(B-V)]_{max}$ is not well constrained yet. We used $V$-band polarimetry of the Interstellar Polarization Survey (consisting of $sim$10500 high-quality observations distributed in 34 fields of $0.3^{circ}times0.3^{circ}$) to accurately estimate the polarization efficiency in the interstellar medium. We estimated the upper limit of P$_V$/E($B-V$) with the weighted $99th$ percentile of the field. In five regions, the polarization efficiency upper limit is above 13$%$ mag$^{-1}$. Furthermore, we found [P$_V$/E$(B-V)]_{max} = 15.8^{+1.3}_{-0.9}%$ mag$^{-1}$ using diffuse intermediate latitude ($|b|>7.5^{circ}$) regions with apparently strong regular Galactic magnetic field in the plane-of-sky. We studied the variations of P$_V$/E($B-V$) across the sky and tested toy models of polarization efficiency with Galactic longitude that showed some correspondence with a uniform spiral magnetic field." @default.
- W4380558666 created "2023-06-14" @default.
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- W4380558666 date "2023-06-12" @default.
- W4380558666 modified "2023-09-26" @default.
- W4380558666 title "Interstellar Polarization Survey III: Relation Between Optical Polarization and Reddening in the General Interstellar Medium" @default.
- W4380558666 doi "https://doi.org/10.48550/arxiv.2306.07016" @default.
- W4380558666 hasPublicationYear "2023" @default.
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