Magnetic fields and infall motions in NGC 1333 Iras 4

Michael Attard*, Martin Houde, Giles Novak, Hua Bai Li, John E. Vaillancourt, C. Darren Dowell, Jacqueline Davidson, Hiroko Shinnaga

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We 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.

Original languageEnglish (US)
Pages (from-to)1584-1592
Number of pages9
JournalAstrophysical Journal
Issue number2
StatePublished - 2009


  • ISM: individual (NGC 1333 IRAS 4)
  • ISM: magnetic fields
  • ISM: molecules
  • Polarization
  • Stars: formation
  • Submillimeter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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