Probing the nature of the ISM in Active Galactic Nuclei through HI absorption

Details Probing the nature of the ISM in Active Galactic Nuclei through HI absorption Probing the nature of the ISM in Active Galactic Nuclei through HI absorption

2005-01-25

arxiv.org/abs/astro-ph/0501544v1

Astronomy and Astrophysics

Astrophysics

7 pages. 4 figures. Proceedings of the 7th European VLBI Network Symposium held in Toledo, Spain on October 12-15, 2004. Edito

Scientific paper

The physical and kinematical conditions of the gas surrounding an active galactic nucleus (AGN) offer key diagnostics for understanding the processes occurring in the inner few kpc around the nucleus. Neutral hydrogen can give important insights on these regions. Apart from probing the presence of gas in relatively settled conditions (i.e. circumnuclear disks/tori) it can also trace the presence of extreme outflows. Some examples of these phenomena are briefly presented. For the study of the neutral hydrogen around AGN the high resolution offered by the VLBI is crucial in order to locate the regions where the absorption occurs and to study in detail the kinematics of the gas. Recent VLBI results are discussed here.

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