1995A&A...293L..61M

We have measured the 800µm polarization at the flux peak for both NGC1333 IRAS4A and 4B. The polarization position angle is similar for both sources (132deg±3deg for 4A and 100deg±10deg for 4B) and are aligned with the plane of the 800µm extended emission plateau that contains the two sources and orthogonal to the CO outflow axis for 4A (position angle ∼42deg). The observed polarization position angles imply the dust grains are preferentially aligned along the plane of the extended dust ridge, implying the magnetic field is orthogonal to the dust disk and aligned with the direction of the large scale molecular outflows. Therefore, within the resolution of these observations (14 arcsec FWHM) the circumstellar magnetic fields around IRAS 4A and 4B appear poloidal.