Pressure-supported ionized gas in so galaxies1
- Author(s)
- Francesco Bertola, Pieratonio Cinzano, Enrico Maria Corsini, Hans Walter Rix, Werner W. Zeilinger
- Abstract
Rotation curves and velocity dispersion profiles are presented for both the stellar and gaseous components of a sample of SO galaxies. In all galaxies the central velocity dispersion of the ionized gas exceeds 150 km s_1. In some galaxies the gas dispersion remains as high as the stellar one over an extended radial range, showing that random motions are crucial for the dynamical support of the gas. Such a pressure support may explain why the observed gas rotation curves in galaxy bulges often fall short of the circular velocity predicted from the stellar kinematic models. It is suggested that, in addition to the acquisition of external material, some of the observed gas in SO galaxies may have been shed from bulge stars.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- University of Padova, Max-Planck-Institut für Astrophysik
- Journal
- Astrophysical Journal
- Volume
- 448
- Pages
- L13-L16
- ISSN
- 0004-637X
- DOI
- https://doi.org/10.1086/309596
- Publication date
- 07-1995
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/pressuresupported-ionized-gas-in-so-galaxies1(8efb783f-203e-493d-b4f4-392c65b064ad).html