Uncovering The Magneto-Centrifugal Origin of Protostellar Jets
Figure 1. An X-wind model (one of the popular magneto-centrifugal models) at large distance away from the launching region. This figure shows that inner streamlines of the wind are gradually collimated by the “hoop stresses” associated with the toroidal magnetic field into a dense cylindrical jet (red part) along the axis, as seen in the observations. Green curves show the magnetic field and arrows show the radial motion of the wind. Blue arrow shows the rotation of the jet, as observed in HH 212. Credit: Chin-Fei Lee
Figure 2. SiO Jet and Accretion Disk in the HH 212 system. (a) ALMA maps of the SiO jet (orange image) and the disk (gray image). (b) Maps of the SiO jet derived from the X-wind model and the disk from an accretion disk model. (c) The X-wind model for the jet. The gray regions are to mimic the SO shells detected around the jet. Credit: Lee et al.
The Atacama Large Millimeter/submillimeter Array (ALMA), an international astronomy facility, is a partnership of the European Organization for Astronomical Research in the Southern Hemisphere (ESO), the U.S. National Science Foundation (NSF) and the National Institutes of Natural Sciences (NINS) of Japan in cooperation with the Republic of Chile. ALMA is funded by ESO on behalf of its Member States, by NSF in cooperation with the National Research Council of Canada (NRC) and the Ministry of Science and Technology (MOST) and by NINS in cooperation with the Academia Sinica (AS) in Taiwan and the Korea Astronomy and Space Science Institute (KASI).
ALMA construction and operations are led by ESO on behalf of its Member States; by the National Radio Astronomy Observatory (NRAO), managed by Associated Universities, Inc. (AUI), on behalf of North America; and by the National Astronomical Observatory of Japan (NAOJ) on behalf of East Asia. The Joint ALMA Observatory (JAO) provides the unified leadership and management of the construction, commissioning and operation of ALMA.
This research was presented in a paper “Magnetocentrifugal Origin for Protostellar Jets Validated through Detection of Radial Flow at the Jet Base” by Lee et al. appeared in Astrophysical Journal Letters.
The team is composed of Chin-Fei Lee (ASIAA, Taiwan; National Taiwan University, Taiwan), Zhi-Yun Li (Astronomy Department, University of Virginia, USA), Hsien Shang, & Naomi Hirano (ASIAA, Taiwan).
Dr. Chin-Fei Lee, Email: email@example.com, Tel: +886 2 2366 5445