Neutral hydrogen absorption in the nucleus of NGC3079

A. Pedlar, C. G. Mundell, J. F. Gallimore, S. A. Baum, C. P. O'Dea

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Abstract

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.

Original languageEnglish
Pages (from-to)91-95
Number of pages5
JournalVistas in Astronomy
Volume40
Issue number1
DOIs
Publication statusPublished - 1 Jan 1996

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ASJC Scopus subject areas

  • Astronomy and Astrophysics

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