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Polarized infrared emission from polycyclic aromatic hydrocarbons (PAHs) isimportant for testing the basic physics of alignment of ultrasmall grains andpotentially offers a new way to trace magnetic fields. In this paper, a newmodel of polarized PAH emission is presented, taking into account the effect ofPAH alignment with the magnetic field. The polarization level of PAH emissionfeatures, for the different phases of the diffuse interstellar medium (ISM) isdiscussed. We find that negatively charged smallest PAHs in the reflectionnebula can be excited to slightly suprathermal rotation due to enhanced ioncollisional excitation, which enhances the degree of PAH alignment and thepolarization level of PAH emission. The polarization level and polarizationangle predicted by our model including PAH alignment are supported by the firstdetection of the polarization of $p\sim 2\%$ at 11.3 $\mu$m PAH feature fromMWC 1080 nebula by Zhang et al. The theoretical and observational progressreveals that PAHs can be aligned with the magnetic field, resulting in amoderate polarization level of spinning dust emission. Polarized infrared PAHpolarization would be useful for tracing the magnetic fields.

Polarization of Infrared Emission from Polycyclic Aromatic Hydrocarbons