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Home List of Titles Spatially resolved kinematics and stellar populations of brightest cluster and group galaxies
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/37196
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- Spatially resolved kinematics and stellar populations of brightest cluster and group galaxies
- Brough, Sarah; Proctor, Robert N.; Forbes, Duncan A.; Couch, Warrick J.; Collins, Chris A.; Burke, Douglas J.; Mann, Robert G.
- We present an examination of the kinematics and stellar populations of a sample of three brightest group galaxies (BGGs) and three brightest cluster galaxies (BCGs) in X-ray groups and clusters. We have obtained high signal-to-noise ratio Gemini/Gemini South Multi-Object Spectrograph (GMOS) long-slit spectra of these galaxies and use Lick indices to determine ages, metallicities and alpha-element abundance ratios out to at least their effective radii. We find that the BGGs and BCGs have very uniform masses, central ages and central metallicities. Examining the radial dependence of their stellar populations, we find no significant velocity dispersion, age, or alpha-enhancement gradients. However, we find a wide range of metallicity gradients, suggesting a variety of formation mechanisms. The range of metallicity gradients observed is surprising, given the homogeneous environment these galaxies probe and their uniform central stellar populations. However, our results are inconsistent with any single model of galaxy formation and emphasize the need for more theoretical understanding of both the origins of metallicity gradients and galaxy formation itself. We postulate two possible physical causes for the different formation mechanisms.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Monthly Notices of the Royal Astronomical Society, Vol. 378, no. 4 (Jun 2007), p. 1507-1530
- Publication year
- BCGs; BGGs; Brightest cluster galaxies; Brightest group galaxies; cD; Clusters; Elliptical galaxies; Galaxy evolution; Galaxy formation; Gemini/Gemini South Multi-Object Spectrograph; GMOS; Lenticular galaxies
- Blackwell Publishing
- Publisher URL
- Copyright © 2007 Royal Astronomical Society. Author's final draft reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed