NGC 3521: Stellar counter-rotation induced by a bar component

Autor(en)

Werner Zeilinger, Juan Carlos Vega Beltran, Maite Rozas, John E. Beckman, Alessandro Pizzella, Enrico Maria Corsini, Francesco Bertola

Abstrakt

The spiral galaxy NGC 3521 exhibits apparently normal kinematic properties of gas and stars along its major axis. However, the analysis of the LOSVD reveals strong asymmetries. A decomposition of the LOSVD data with a two-Gaussian component model shows two counter-rotating stellar components. The observed kinematic decoupling is interpreted as a projection effect induced by the presence of a bar component seen almost end on. The bar produces locally a greater concentration of retrograde stellar orbits but this does not relate to a specific counter-rotating population. The signatures of the bar are identified in the velocity field derived from long-slit spectra obtained along the major, minor and 45° intermediate axes and from R-band surface photometry.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Instituto de Astrofísica de Canarias (IAC), Università degli Studi di Padova

Journal

Astrophysics and Space Science

Band

276

Seiten

643-650

Anzahl der Seiten

8

ISSN

0004-640X

Publikationsdatum

2001

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6493b956-47ef-4412-84af-89386fa302c9