Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456..217c&link_type=abstract
Astrophysical Journal v.456, p.217
Astronomy and Astrophysics
Astronomy
38
Ism: Clouds, Ism: Magnetic Fields, Ism: Molecules, Polarization
Scientific paper
We present results from the first attempt to measure strengths of magnetic fields in dense molecular cloud cores by observations of the Zeeman effect in the 3 mm lines of CN. The observations were made with the 30 m IRAM radio telescope with a new polarimeter constructed for this experiment. The two molecular cores which were observed are located about 3' north of Orion-KL (OMC-N4) and about 1' east of IRS 4 in S106 (S106-CN). From CN data for OMC-N4 and S106-CN, respectively, we estimate cloud radii of 0.03 and 0.05 pc, masses of 10 and 22 Msun/SUB>, and H2 densities of 1.6 × 106 cm-3. Our CN Zeeman results for the line-of-sight magnetic fields are B1os(OMC-N4) = +79±99 μG and B1os(S106-CN) = -57±199 μG. Hence, we did not detect magnetic fields. Our upper limits for B1os are significantly less than field strengths expected for assumption of internal motions at the Alfvén speed, of a critical mass to magnetic flux ratio, or of virial equilibrium, but the very small sample of clouds and the uncertainties in the ∣B∣Alfvén, ∣B∣critical, and ∣B∣virial estimates preclude definite conclusions.
Crutcher Richard M.
Kazes Ilya
Lazareff Bernard
Troland Thomas H.
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