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Title

Probing the 2-D kinematic structure of early-type galaxies out to 3 effective radii

Author(s)

Proctor, Robert N.;  Forbes, Duncan A.;  Romanowsky, Aaron J.;  Brodie, Jean P.;  Strader, Jay;  Spolaor, Max;  Mendel, Trevor;  Spitler, Lee

Abstract

We detail an innovative new technique for measuring the 2-D velocity moments (rotation velocity, velocity dispersion and Gauss-Hermite coefficients h3 and h4) using spectra from Keck DEIMOS multi-object spectroscopic observations. The data are used to reconstruct 2-D rotation velocity maps.Here we present data for one of five early-type galaxies whose kinematics we have measured out to ~3 effective radii (see [1]). From these data 2D kinematic maps are constructed. We show such analyses can provide significant insights into the global kinematic structure of galaxies, and, in some cases, challenge the accepted morphological classification. Our results are of particular importance to studies which attempt to classify galaxies by their kinematic structure within one effective radius, such as the recent definition of fast- and slow- rotator classes by the SAURON project.

Publication type

Conference paper

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

AIP conference proceedings: Proceedings of 'Hunting for the dark: the hidden side of galaxy formation', University of Central Lancashire, Malta, 19-23 October 2009 / Victor P. Debattista and Cristina C. Popescu (eds.), Vol. 1240, no. 1 (Jun 2010), pp. 339-342

Publication year

2010

FOR Code(s)

020104 Galactic Astronomy

Keyword(s)

DEIMOS;  Galactic centre;  Galaxy kinematics;  Gauss-Hermite coefficients;  Globular star clusters;  Keck;  Multi-object spectroscopic observations;  Rotation velocity;  SAURON Project;  Spectra;  Velocity dispersion

Publisher

American Institute of Physics

ISSN

0094-243X (series ISSN)

ISBN

9780735407862, 073540786X

Publisher URL

http://dx.doi.org/10.1063/1.3458528

Copyright

Copyright © 2010 American Institute of Physics. Published version of this paper reproduced here in accordance with the copyright policy of the publisher.

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