The role of the galactic magnetic field in the evolution of a dark globular filament in Cygnus

Details The role of the galactic magnetic field in the evolution of a dark globular filament in Cygnus The role of the galactic magnetic field in the evolution of a dark globular filament in Cygnus

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..141m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 141-143.

Astronomy and Astrophysics

Astrophysics

10

Cygnus Constellation, Interstellar Magnetic Fields, Milky Way Galaxy, Optical Polarization, Stellar Evolution, Cosmic Dust, Interstellar Matter, Magnetohydrodynamics

Scientific paper

Optical polarimetry is presented for background stars and adjacent field stars in the direction of the dark globular filament GF 7 in Cygnus. Assuming that the observed polarization is due to the alignment of dust grains by paramagnetic relaxation, the magnetic field associated with the filament is mapped. The direction of the magnetic field is found to coincide with the long axis of the filament, as would be expected if the filament were a cylindrical fragment of a perturbed layer containing an ordered magnetic field. The subsequent breakup of the filament along its length into discrete clouds with regular separation agrees with the theory of the instability of a cylinder with an axial magnetic field. This observation is a clear example of a case in which the galactic magnetic field plays a significant role in the process of star formation, since the expected geometry of the collapse and fragmentation would be quite different in the absence of a magnetic field.

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