期刊
ASTROPHYSICAL JOURNAL
卷 807, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/807/1/5
关键词
ISM: clouds; ISM: individual objects (Lupus I); ISM: magnetic fields; techniques: polarimetric
资金
- National Aeronautics and Space Administration
- National Science Foundation
- Infrared Astronomical Satellite
- U.S. Government grant [NAG W-2166]
- CNPq
- FAPEMIG
Deep R-band CCD linear polarimetry collected for fields with lines of sight toward the Lupus I molecular cloud is used to investigate the properties of the magnetic field within this molecular cloud. The observed sample contains about 7000 stars, almost 2000 of them with a polarization signal-to-noise ratio larger than 5. These data cover almost the entire main molecular cloud and also sample two diffuse infrared patches in the neighborhood of Lupus I. The large-scale pattern of the plane-of-sky projection of the magnetic field is perpendicular to the main axis of Lupus I, but parallel to the two diffuse infrared patches. A detailed analysis of our polarization data combined with the Herschel/SPIRE 350 mu m dust emission map shows that the principal filament of Lupus I is constituted by three main clumps that are acted on by magnetic fields that have different large-scale structural. properties. These differences may be the reason for the observed distribution of pre- and protostellar objects along the molecular cloud and the cloud's. apparent evolutionary stage. On the other hand, assuming that the magnetic field is composed of. large-scale and turbulent components, we find that the latter is rather similar in all three clumps. The estimated plane-of-sky component of the large-scale magnetic field ranges from about 70 to 200 mu G in these clumps. The intensity increases toward the Galactic plane. The mass-to-magnetic flux ratio is much smaller than unity, implying that Lupus I is magnetically supported on large scales.
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