We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 x 3 arcseconds (300 x 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200-400 km s-1) and deep (τ ∼ 0.5-1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 1022 atoms cm-2. The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 109M⊙, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.
ASJC Scopus subject areas
- Astronomy and Astrophysics