Molecular absorption in Cen A on VLBI scales

Details Molecular absorption in Cen A on VLBI scales Molecular absorption in Cen A on VLBI scales

2004-09-07

arxiv.org/abs/astro-ph/0409147v1

Astronomy and Astrophysics

Astrophysics

To appear in the Proceedings of the 2004 European Workshop: "Dense Molecular Gas around Protostars and in Galactic Nuclei", Ed

Scientific paper

10.1007/s10509-005-3699-5

Centaurus A, the nearest AGN shows molecular absorption in the millimeter and radio regime. By observing the absorption with VLBI, we try to constrain the distribution of the gas, in particular whether it resides in the circumnuclear region. Analysis of VLBA observations in four OH and two H2CO transitions is presented here, as well as molecular excitation models parameterized with distance from the AGN. We conclude that the gas is most likely associated with the tilted molecular ring structure observed before in molecular emission and IR continuum. The formaldehyde absorption shows small scale absorption which requires a different distribution than the hydroxyl.

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