Stellar dynamical evidence for dark halos in elliptical galaxies: The case of NGC 4472, IC 4296, and NGC 7144

Autor(en)

Roberto P Saglia, G Bertin, Francesco Bertola, John Danziger, Herwig B. Dejonghe, Elaine M Sadler, M Stiavelli, P Tim de Zeeuw, Werner Zeilinger

Abstrakt

Extended and accurate major axis kinematical profiles and line strength gradients of the elliptical galaxies NGC 4472, IC 4296, and NGC 7144 have been measured using the ESO NTT in the EMMI long-slit spectroscopic mode. For NGC 7144 the stellar rotation curve and velocity dispersion profile extend to 75? from the center (where the surface brightness is 24.4 B-mag arcsec-2, 2.8 mag below the sky), with typical error bars of 10 km s-1. The flat or slowly increasing velocity dispersion profiles of these galaxies indicate that massive dark halos might dominate their dynamics.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Max-Planck-Institut für extraterrestrische Physik, Astronomical Observatory of Triest, Università degli Studi di Padova, INAF Astronomical Observatory of Triest, Ghent University , The University of Sydney, European Southern Observatory (Germany), Leiden University

Journal

The Astrophysical Journal: an international review of astronomy and astronomical physics

Band

403

Seiten

567-572

Anzahl der Seiten

6

ISSN

0004-637X

Publikationsdatum

1993

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/c7768705-e7f7-4b94-abf6-7d7602b2035a