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We present dust polarization and CO molecular line images of NGC 7538 IRS1.We combined data from the SMA, CARMA and JCMT telescopes to make images with2.5 arcsec resolution at 230 and 345 GHz. The images show a remarkable spiralpattern in both the dust polarization and molecular outflow. These datadramatically illustrate the interplay between a high infall rate onto IRS1 anda powerful outflow disrupting the dense, clumpy medium surrounding the star.The images of the dust polarization and the CO outflow presented here provideobservational evidence for the exchange of energy and angular momentum betweenthe infall and the outflow. The spiral dust pattern, which rotates through over180 degrees from IRS1, may be a clumpy filament wound up by conservation ofangular momentum in the infalling material. The redshifted CO emission ridgetraces the dust spiral closely through the MM dust cores, several of which maycontain protostars. We propose that the CO maps the boundary layer where theoutflow is ablating gas from the dense gas in the spiral.

NGC 7538 IRS1: Interaction of a polarized dust spiral and a molecular outflow