Michael Attard et al. 2009 ApJ 702 1584 doi:10.1088/0004-637X/702/2/1584
Michael Attard1, Martin Houde1, Giles Novak2, Hua-bai Li3, John E. Vaillancourt4, C. Darren Dowell4,5, Jacqueline Davidson6 and Hiroko Shinnaga7
Show affiliationsWe present single-dish 350 μm 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.
ISM: individual (NGC 1333 IRAS 4); ISM: magnetic fields; ISM: molecules; polarization; stars: formation; submillimeter
Issue 2 (2009 September 10)
Received 2009 May 4, accepted for publication 2009 July 8
Published 2009 August 24
Michael Attard et al. 2009 ApJ 702 1584
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