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28 March 2024
 
  » arxiv » astro-ph/0204006

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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 Beltran ; C. Scarlata ; F. Bertola ;
Date 1 Apr 2002
Subject astro-ph
AffiliationVatican Obs.), E.M. Corsini (Univ. of Padova), M. Cappellari (Leiden Obs.), A. Pizzella (Univ. of Padova), J.C. Vega Beltran (IAC), C. Scarlata (Univ. of Padova/STScI), F. Bertola (Univ. of Padova
AbstractWe 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.
Source arXiv, astro-ph/0204006
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