The warm molecular hydrogen of PKS B1718-649. Feeding a newly born radio AGN

F. M. Maccagni, F. Santoro, R. Morganti, T. A. Oosterloo, J. B. R. Oonk, B. H. C. Emonts

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Abstract

We present new SINFONI VLT observations of molecular hydrogen (H 2) in the central regions () in the central regions ( 2 traced by the 1-0 S(1) ro-vibrational line, revealing a double disk structure with the kinematics of both disks characterised by rotation. An outer disk (r > 650 pc) is aligned with other components of the galaxy (atomic hydrogen, stars, dust), while the inner disk (r traced by the 1-0 S(1) ro-vibrational line, revealing a double disk structure with the kinematics of both disks characterised by rotation. An outer disk (r > 650 pc) is aligned with other components of the galaxy (atomic hydrogen, stars, dust), while the inner disk (r 2 gas redshifted with respect to the rotating inner disk (Δv ~ + 150 km s-1), which may trace gas falling into the super massive black hole associated with the central radio source. Along the same line of sight, earlier observations had shown the presence in the central regions of PKS B1718-649 of clouds of atomic hydrogen with similar unsettled kinematics. The range of velocities and mass of these unsettled clouds of H i and H 2 suggest they may be actively contributing to fuelling the central newly born radio source.
Original languageEnglish
Article numberA46
JournalAstronomy and astrophysics
Volume588
DOIs
Publication statusPublished - Apr-2016

Keywords

  • galaxies: individual: PKS B1718-649
  • galaxies: active
  • infrared: ISM
  • galaxies: kinematics and dynamics
  • ISM: clouds
  • HII regions

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