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COMPARISON OF TWO EPOCHS OF THE ZEEMAN EFFECT IN THE 44 GHz CLASS I METHANOL (CH3OH) MASER LINE IN OMC-2
被引:7
作者:
Momjian, E.
[1
]
Sarma, A. P.
[2
]
机构:
[1] Natl Radio Astron Observ, Socorro, NM 87801 USA
[2] Depaul Univ, Dept Phys, Chicago, IL 60614 USA
关键词:
ISM: clouds;
ISM: magnetic fields;
masers;
polarization;
radio lines: ISM;
stars: formation;
LARGE ARRAY DETECTION;
MAGNETIC-FIELDS;
STAR-FORMATION;
REGIONS;
D O I:
10.1088/0004-6256/144/6/189
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We present a second epoch of observations of the 44 GHz Class I methanol maser line toward the star-forming region Orion Molecular Cloud 2. The observations were carried out with the Very Large Array, and constitute one of the first successful Zeeman effect detections with the new Wide-band Digital Architecture correlator. Comparing to the result of our earlier epoch of data for this region, we find that the intensity of the maser increased by 50%, but the magnetic field value has stayed the same, within the errors. This suggests that the methanol maser may be tracing the large-scale magnetic field that is not affected by the bulk gas motions or turbulence on smaller scales that is causing the change in maser intensity.
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