Bibcode
Alves, Felipe O.; Acosta-Pulido, J. A.; Girart, Josep M.; Franco, Gabriel A. P.; López, Rosario
Referencia bibliográfica
The Astronomical Journal, Volume 142, Issue 1, article id. 33 (2011).
Advertised on:
7
2011
Número de citas
21
Número de citas referidas
18
Descripción
We performed J- and R-band linear polarimetry with the 4.2 m William
Herschel Telescope at the Observatorio del Roque de los Muchachos and
with the 1.6 m telescope at the Observatório do Pico dos Dias,
respectively, to derive the magnetic field geometry of the diffuse
molecular cloud surrounding the embedded protostellar system NGC 1333
IRAS 4A. We obtained interstellar polarization data for about three
dozen stars. The distribution of polarization position angles has low
dispersion and suggests the existence of an ordered magnetic field
component at physical scales larger than the protostar. Some of the
observed stars present intrinsic polarization and evidence of being
young stellar objects. The estimated mean orientation of the
interstellar magnetic field as derived from these data is almost
perpendicular to the main direction of the magnetic field associated
with the dense molecular envelope around IRAS 4A. Since the distribution
of the CO emission in NGC 1333 indicates that the diffuse molecular gas
has a multi-layered structure, we suggest that the observed polarization
position angles are caused by the superposed projection of different
magnetic field components along the line of sight.
Based on observations collected with the 4.2 m William Herschel
Telescope, at La Palma, Canary Islands (Spain) and the 1.6 m Telescope
of the Observatório do Pico dos Dias, operated by
Laboratório Nacional de Astrofísica (LNA/MCT, Brazil).
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