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Huirong Yan
DESY & Uni Potsdam

Tracing Magnetic field with Submillimeter spetropolarimetry

Submillimeter polarimetry associated with grain alignment is accepted as one of the major avenues for detection of interstellar magnetic fields. The submm spectropolarimetry, on the other hand, is still an unexplored territory beyond the molecular clouds. Fine structure lines are polarized due to ground state alignment (GSA) by optical pumping. The polarization of the submillimeter fine-structure lines induced could be substantial. This method is applicable to all radiative-excitation dominant region, e.g., H II Regions, PDRs. The potential of the new magnetic tracer has been clearly revealed by the first detection of GSA effect on a binary system where 3D magnetic fields are precisely mapped. Our results demonstrate submillimeter polarimetry as a powerful magnetic tracer, including the environments where dust alignment is unreliable, e.g., protoplanetary discs.