期刊
ASTROPHYSICAL JOURNAL
卷 702, 期 2, 页码 1584-1592出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/702/2/1584
关键词
ISM: individual (NGC 1333 IRAS 4); ISM: magnetic fields; ISM: molecules; polarization; stars: formation; submillimeter
资金
- NSERC
- Canada Foundation for Innovation
- Ontario Innovation Trust
- Western's Academic Development Fund
- NSF [AST 05-40882, AST 02-43156, AST 05-05230, AST 05-05124]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [838261] Funding Source: National Science Foundation
We present single-dish 350 mu m dust continuum polarimetry as well as HCN and HCO+ J = 4 -> 3 rotational emission spectra obtained on NGC 1333 IRAS 4. The polarimetry indicates a uniform field morphology over a 20 '' radius from the peak continuum flux of IRAS 4A, in agreement with models of magnetically supported cloud collapse. The field morphology around IRAS 4B appears to be quite distinct, however, with indications of depolarization observed toward the peak flux of this source. Inverse P Cygni profiles are observed in the HCN J = 4 -> 3 line spectra toward IRAS 4A, providing a clear indication of infall gas motions. Taken together, the evidence gathered here appears to support the scenario that IRAS 4A is a cloud core in a critical state of support against gravitational collapse.
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