Centaurus A: Morphology and kinematics of the HI disk

TL;DR

This paper reports new observations of Centaurus A's HI disk, revealing detailed morphology and kinematics, including a tilted-ring model and previously unknown absorption features, enhancing understanding of its structure.

Contribution

It introduces new ATCA HI emission and absorption data, modeling the large-scale disk with a tilted-ring approach and identifying additional absorption components.

Findings

Discovery of broader redshifted absorption

Detection of blueshifted absorption against the nucleus

Modeling of the HI disk with a tilted-ring structure

Abstract

We present first results of new ATCA HI emission and absorption observations of Centaurus A. The large-scale disk is described via a tilted-ring model. A broader redshifted absorption than previously known as well as a blueshifted absorption component against the nucleus is found.