HI and OH Absorption toward NGC6240

Details HI and OH Absorption toward NGC6240 HI and OH Absorption toward NGC6240

2007-02-20

arxiv.org/abs/astro-ph/0702522v1

Astrophys.J.661:173-184,2007

Astronomy and Astrophysics

Astrophysics

To be published in the ApJ, Vol 661, May 20, 2007, 32 pages, 11 figures

Scientific paper

10.1086/513593

VLA observations of large-scale HI and OH absorption in the merging galaxy of NGC6240 are presented with 1 arcsec resolution. HI absorption is found across large areas of the extended radio continuum structure with a strong concentration towards the double-nucleus. The OH absorption is confined to the nuclear region. The HI and OH observations identify fractions of the gas disks of the two galaxies and confirm the presence of central gas accumulation between the nuclei. The data clearly identify the nucleus of the southern galaxy as the origin of the symmetric superwind outflow and also reveal blue-shifted components resulting from a nuclear starburst. Various absorption components are associated with large-scale dynamics of the system including a foreground dust lane crossing the radio structure in the northwest region.

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