The Warped Disk of Centaurus A from a Radius of 2 to 6500pc

Alice C. Quillen*, Nadine Neumayer, Thomas Oosterloo, Daniel Espada

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We compile position and inclination angles for tilted ring fits to the warped dusty and gaseous disk of Cen A, spanning a radius of 1.8 to 6500 pc, from recent observations. For radii exterior to 1 kpc, tilted-ring orientations lie on an arc, on a plot of polar-inclination versus position-angle, suggesting that precession following a merger can account for the ring morphology. Three kinks in the ring orientations are seen on the polar plot, the one at radius of about 1.3 kpc we suspect corresponds to the location where self-gravity in the disk affects the ring precession rate. Another at a radius of about 600 pc may be associated with a gap in the gas distribution. A third kink is seen at a radius of 100 pc. A constant inclination tilted disk precessing about the jet axis may describe the disk between 100 and 20 pc but not interior to this. A model with disk orientation matching the molecular circumnuclear disk at 100 pc that decays at smaller radii to an inner flat disk perpendicular to the jet may account for disk orientations within 100 pc. Neither model would account for the cusps or changes in disk orientation at 100 or 600 pc.

Original languageEnglish
Pages (from-to)396-401
Number of pages6
JournalPublications of the Astronomical Society of Australia
Volume27
Issue number4
DOIs
Publication statusPublished - Oct-2010

Keywords

  • galaxies: individual (NGC 5128, Cen A)
  • galaxies: jets
  • galaxies: nuclei
  • ACCRETION DISKS
  • MOLECULAR GAS
  • BLACK-HOLE
  • EVOLUTION
  • KINEMATICS
  • JET
  • PRECESSION
  • NGC-5128
  • ORIGIN
  • MASS

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