Pressure-supported ionized gas in so galaxies1

Autor(en)

Francesco Bertola, Pieratonio Cinzano, Enrico Maria Corsini, Hans Walter Rix, Werner W. Zeilinger

Abstrakt

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(en)

Institut für Astrophysik

Externe Organisation(en)

Università degli Studi di Padova, Max-Planck-Institut für Astrophysik

Journal

Astrophysical Journal

Band

448

Seiten

L13-L16

ISSN

0004-637X

DOI

https://doi.org/10.1086/309596

Publikationsdatum

07-1995

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/pressuresupported-ionized-gas-in-so-galaxies1(8efb783f-203e-493d-b4f4-392c65b064ad).html