Kinematics, substructure and luminosity-weighted dynamics of six nearby galaxy groups

Firth, P., Evstigneeva, E. A., Jones, J. B., Drinkwater, M. J., Phillipps, S. and Gregg, M. D. (2006) Kinematics, substructure and luminosity-weighted dynamics of six nearby galaxy groups. Monthly Notices Of The Royal Astronomical Society, 372 4: 1856-1868. doi:10.1111/j.1365-2966.2006.10993.x


Author Firth, P.
Evstigneeva, E. A.
Jones, J. B.
Drinkwater, M. J.
Phillipps, S.
Gregg, M. D.
Title Kinematics, substructure and luminosity-weighted dynamics of six nearby galaxy groups
Journal name Monthly Notices Of The Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2006-01-01
Year available 2006
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2006.10993.x
Open Access Status DOI
Volume 372
Issue 4
Start page 1856
End page 1868
Total pages 13
Editor A. C. Fabian
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract We have redefined group membership of six southern galaxy groups in the local universe (mean cz < 2000 km s(-1)) based on new redshift measurements from our recently acquired Anglo-Australian Telescope 2dF spectra. For each group, we investigate member galaxy kinematics, substructure, luminosity functions and luminosity-weighted dynamics. Our calculations confirm that the group sizes, virial masses and luminosities cover the range expected for galaxy groups, except that the luminosity of NGC 4038 is boosted by the central starburst merger pair. We find that a combination of kinematical, substructural and dynamical techniques can reliably distinguish loose, unvirialized groups from compact, dynamically relaxed groups. Applying these techniques, we find that Dorado, NGC 4038 and NGC 4697 are unvirialized, whereas NGC 681, NGC 1400 and NGC 5084 are dynamically relaxed.
Keyword Astronomy & Astrophysics
Galaxies
Redshifts
Virial Masses
Sky Survey
Clusters
Catalog
Population
Systems
Tests
Kinematics
Galaxies : Distances And Redshifts
Galaxies : Kinematics And Dynamics
Q-Index Code C1
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 18:52:47 EST