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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : (please change"_at" to @).

August 10, Monday, 11:00 am in 104

" Observing magnetic fields in molecular clouds "

Kwok Sun Tang

(Chinese University of Hong Kong)

I will report magnetic-field maps inferred from our polarimetric observations of NGC 6334, a region forming massive stars, from 100 to 0.01 parsec scale. NGC 6334 hosts young star-forming sites, where fields are not severely affected by stellar feedback, and their directions do not change much over the entire scale range. The ordered fields lead to a self-similar gas fragmentation: at all scales, there exist elongated gas structures nearly perpendicular to the fields. These indicates the magnetic fields are dynamically important in the fragmentation of NGC 6334. Then, I would try to put forward our explanation towards the commonly observed depolarization of thermal dust emission towards high density regions. With data archives from JCMT and CARMA, we will show that the common proposal, which suggested that dust grains are no longer aligned when Av > 3mag, is insufficient to explain the observations from various scales. We propose line of sight magnetic field structures may significantly lower the observed polarization and may constitute the prime reason for this phenomenon.

Seminars are also held at JAC, CFHT, and IfA.

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