Position-velocity diagrams of ionized gas in the inner regions of disk galaxies

J. G. Funes, E. M. Corsini, M. Cappellari, A. Pizzella, J. C. Vega Beltrán, C. Scarlata, F. Bertola

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11 Scopus citations


We use long-slit spectroscopy along the major axis of a sample of 23 nearby disk galaxies to study the kinematic properties of the ionized-gas component in their inner regions. For each galaxy, we derive the position-velocity diagram of the ionized gas from its emission lines. We discuss the variety of shapes observed in such position-velocity diagrams by comparing the gas velocity gradient, velocity dispersion and integrated flux measured in the inner (r ≃ ±1″) and outer regions (r ≃ ±4″). This kind of analysis allows the identification of galaxies which are good candidates to host a circumnuclear Keplerian gaseous disk rotating around a central mass concentration, and to follow up with Hubble Space Telescope observations.

Original languageEnglish (US)
Pages (from-to)50-67
Number of pages18
JournalAstronomy and Astrophysics
Issue number1
StatePublished - Jun 2002


  • Black hole physics
  • Galaxies: ISM
  • Galaxies: kinematics and dynamics
  • Galaxies: nuclei
  • Galaxies: spiral
  • Galaxies: structure


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