VLA H I Zeeman Observations of Centaurus A

Details VLA H I Zeeman Observations of Centaurus A VLA H I Zeeman Observations of Centaurus A

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...564..696s&link_type=abstract

The Astrophysical Journal, Volume 564, Issue 2, pp. 696-703.

Astronomy and Astrophysics

Astronomy

18

Galaxies: Active, Galaxies: Individual (Ngc 5128), Galaxies: Magnetic Fields, Radio Lines: Galaxies

Scientific paper

We present H I absorption observations toward the nucleus and neighboring radio features of Centaurus A, with the aim of studying the magnetic field using the Zeeman effect. The H I profiles toward the nucleus reveal for the first time a broad absorption component that extends up to 635 km s-1 and is centered near 583 km s-1. This broad component may be a blend of absorption in several clouds located in the ~100 pc radius circumnuclear ring of Cen A. We set upper limits on the line-of-sight magnetic field (Blos) in Cen A in the regions traced by the H I absorption components. The best value (fit+/-1 σ error) for Blos in the dust lane is -3+/-7 μG. For the redshifted narrow line width components observed toward the nucleus, Blos is ~10+/-20 μG. If we assume the spin temperature Ts<=50 K in these redshifted clouds, our analysis shows that the magnetic fields will be energetically significant if Blos>=5 μG for cloud sizes around a few parsecs or larger.

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