2008/05/12 by R. Morganti, Tom Oosterloo, T. Oosterloo +3 · 32 citations
Physics and Astronomy · #Absorption (acoustics) #Active galactic nucleus #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Centaurus A #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Optics #Physics #Redshift #Telescope #astro-ph
paper · pdf · doi:10.1051/0004-6361:200809974
published in Astronomy and Astrophysics 485(2), L5-L8 (EDP Sciences) · Accepted for publication in A&A Letter, 4 pages, 2 figures
arxiv created 2008/05/12 · openalex publication_date 2008/05/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present new observations, performed with the Australia Telescope Compact Array, of the absorption in the central regions of Centaurus A. For the first time, absorption is detected against the radio core at velocities blueshifted with respect to the systemic velocity. Moreover, the data show that the nuclear redshifted absorption component is broader than reported before. With these new results, the kinematics of the in the inner regions of Cen A appears very similar to that observed in emission for the molecular circumnuclear disk. This suggests that the central absorption is not, as was previously claimed, evidence of gas infall into the AGN, but instead is due to a cold, circumnuclear disk.