Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-07-07
Astrophys.J.702:1584-1592,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
23 pages, 6 figures, 2 tables
Scientific paper
10.1088/0004-637X/702/2/1584
We present single-dish 350 micron 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 towards the peak flux of this source. Inverse P-Cygni profiles are observed in the HCN J=4-3 line spectra towards 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.
Attard Michael
Davidson Jacqueline
Dowell Charles (Darren)
Houde Martin
Li Hua-bai
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