Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-10-28
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted by The Astrophysical Journal (ApJ). Consists of 37 pages with 9 figures and 5 tables. Abstract below is abridged
Scientific paper
We present polarization observations of the dust continuum emission from IRAS 16293 which is a Class 0 protostar and is known to have at least two components, source A and B. These measurements were conducted by the Submillimeter Array (SMA) at a frequency of ~341 GHz and with high angular resolution (~2-3 arcseconds). We find that the large scale global direction of the field, which is perpendicular to the observed polarization, appears to be along the dust ridge where the emission peaks. On smaller scales we find that the field structure is significantly different for the two components of the binary. The first component, source A, shows a magnetic field structure which is "hourglass" shaped as predicted from theoretical models of low mass star formation in the presence of strong magnetic fields. However, the other component, source B, shows a relatively ordered magnetic field with no evidence of any deformation. There is an observed decrease in polarization towards the center. Our calculations show that in IRAS 16293 the magnetic energy is stronger than the turbulent energy but is approximately similar to the centrifugal energy. Our results provide additional evidence to show that the two protostars appear to be in different stages during their evolution.
Girart Josep Miquel
Lai Shih-Ping
Marrone Daniel P.
Rao Ramprasad
Schnee Scott
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