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We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 3 arcseconds (300 200 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 10 22 atoms cm -2 . The absorption...
The angular resolution of 0.15 arcsec ( 10 pc), achieved by MERLIN, is ideal for investigation of neutral gas in the nuclei of nearby Seyferts on scales of < 10 pc. We present, here, such observations of the radio source associated with the nucleus of NGC4151. We find that only the component containing the nucleus shows significant absorption, whereas no measurable absorption is seen against...