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.

 

Connect with NRAO

The National Radio Astronomy Observatory and Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.

The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."

AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.