The Magentic Field in Tapia's Globule 2

Details The Magentic Field in Tapia's Globule 2 The Magentic Field in Tapia's Globule 2

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3098a&link_type=abstract

ATNF proposal P736, Semester: April, 2010

Physics

Interstellar Medium In And Around The Milky Way, Magnetic Fields, Parkes

Scientific paper

We propose to measure the magnetic field in the Southern Coalsack, using the Zeeman effect in OH at 1665 and 1667 MHz. The impetus for this measurement comes 1) from the large magnetic field (B~90 uG) derived by Andersson & Potter (2005), using Chandrasekhar-Fermi analysis of optical polarimetry and 2) because the Southern Coalsack may be a near-by example of triggered star formation. While the derived field strength is significantly larger than usually seen in the interstellar medium (ISM), the existence of an X-ray emitting envelope around the cloud, containing significant amounts of O VI ions (Anderson et al., 2004), puts the magnetic pressure at approximate equipartition with the thermal pressure of such gas. A chain of observational results indicates that the Coalsack might be a, maybe unique, near-by example of externally triggered star formation. This chain starts with the passage of the Upper Centaurus-Lupus superbubble over the cloud (Crawford 1991) and eventually causing triggered star formation (Lada et al. 2004; Hennebelle, Witworth & Goodwin 2006). Probing the high magnetic field strength and providing accurate constraints for the interpretation of the observations of the cloud is of great importance for testing this hypothesis.

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