We report observations with the Arecibo telescope of the Zeeman effect in the 1665 and 1667 MHz lines of OH toward eight dark cloud cores. For L1544, the inferred line-of-sight magnetic field is BLOS = +11 ∓ 2 μG. The L1544 starless core has been observed to have infall motions; it may be very close to forming a star. BLOS ≈ 11 μG is consistent with the prediction of an ambipolar diffusion model computed specifically for this core before the Zeeman measurements were made; however, in order to obtain agreement with the data this model has B inclined by only 16° to the plane of the sky. Virial arguments show that unless the magnetic field is mainly in the plane of the sky, it is not important for support of the L1544 core. For L1457S our result is BLOS = -24 ± 7 μG, a possible but not definite detection. The other six cores were observed only with short integration times, and the Zeeman effect was not detected in these cores.
|Issue number||2 PART 2|
|State||Published - Jul 10 2000|
Bibliographical noteFunding Information:
This work was partially supported by NSF grants AST 96-13999, AST 98-20641, and AST 99-88341. The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a co-operative agreement with the National Science Foundation.
- ISM: individual (L1544)
- ISM: magnetic fields
- ISM: molecules
- Stars: formation
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science