Colloq Abstract - Shinnaga
September 23, 2016
11am Mountain
Hiroko Shinnaga
Magnetic Field In An Isolated Massive Dense Clump - A Study Across A High Spatial Dynamic Range
Abstract
We report on a study of the magnetic field structures of IRAS 20126+4104, a massive dense clump in which the rotation axis and the magnetic field axis are misaligned. In order to study the role of magnetic field in high mass star forming regions in detail, we investigate magnetic field of the object in a high spatial dynamic range. The data sets that we use include interferometric data taken with the SMA and single-dish data sets with 9 arcsec beam taken with the SHARP/CSO (Shinnaga et al. 2012) and with 15 arcsec beam taken with SCUPOL at the JCMT telescope (Matthews et al. 2009). Comparing the above results with the VLBI spectropolarimetric observations by Surcis et al. 2014, these four independent data sets allow us to investigate the magnetic field structures across a very high spatial dynamic range (5 × 10^3), between 1 pc scale and down to 20 AU scale of the massive dense clump － massive (∼ 10M_sun) (proto)star system. We carried out detailed theoretical simulations for this object based on the study reported in Shinnaga et al. 2012 and Kataoka et al. 2012. By comparing the observational results with the theoretical simulations, we find that the magnetic field plays a critical role during the course of the gravitational collapse of the massive dense clump.
