Oral Presentation

Pilot SMA mosaic polarization observations

Author(s): Tao-Chung Ching

Presenter: Tao-Chung Ching (National Tsing Hua University)

Observation of dust polarization at submillimeter wavelength is the most efficient method to probe the magnetic fields in the molecular cloud. The large FOV of SMA presents an advantage over ALMA for large-area mosaic polarization observations. We have carried out measurements of SMA off-axis polarization at 230 and 345 GHz bands. The results show that the SMA instrumental polarization is stable and the difference between the SMA on- and off-axis polarization is small compared to the typical error in polarization observations, suggesting that SMA is capable for mosaic polarization mapping. Here we present the first SMA mosaic polarization observation in the 2016A semester. The SMA mosaic polarization observation reveals more extended polarization emission than a single pointing SMA observation. In addition, by combining the SMA high-resolution data and the JCMT zero-spacing data, we provide a more complete view of magnetic field in star forming regions. The performance of the SWARM polarization will also be discussed in our talk.