AAS 197, January 2001
Session 10. Low Mass Star Formation
Display, Monday, January 8, 2001, 9:30am-7:00pm, Exhibit Hall

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[10.16] Measuring the Magnetic Field Strength in L1498 With Zeeman Splitting Observations of CCS

S.M. Levin, W.D. Langer, T.B.H. Kuiper, T. Velusamy (JPL, Caltech), R.M. Crutcher (Dept. of Astronomy, U. Illinois at Urbana-Champaign)

We have measured the Zeeman splitting of the CCS JN = 32 - 21 line at 33 GHz towards L1498, a dense pre-protostellar core, in an effort to measure the line-of-sight component of its magnetic field. With approximately 35 hours of data on source (70 hours total) in good weather, the data suggest a 100 microG 95 of the line of sight component of the magnetic field in L1498, with a formal result of 48+/-31 microG. This limit provides some constraints on models, and our results show that the technique we have adopted to measure CCS Zeeman splitting holds great promise to determine magnetic field strengths in cloud cores using lower frequency transitions, in particular the CCS JN = 10 - 00 line at 11 GHz. At this transition, the frequency splitting per Gauss is three times that at 33 GHz, and receiver systems can be made significantly more sensitive.

This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration

The author(s) of this abstract have provided an email address for comments about the abstract: steve@omega.jpl.nasa.gov

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