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          Institute: MPI für extraterrestrische Physik     Collection: High Energy Astrophysics at MPE     Display Documents



ID: 10679.0, MPI für extraterrestrische Physik / High Energy Astrophysics at MPE
Evolution of brightest cluster galaxies in X-ray clusters
Authors:Brough, S.; Collins, C. A.; Burke, D. J.; Mann, R. G.; Lynam, P. D.
Language:English
Date of Publication (YYYY-MM-DD):2002-01-11
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. R. Astron. Soc.
Volume:329
Issue / Number:2
Start Page:L53
End Page:L56
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:A recent paper presents the analysis of the K-band Hubble diagram of 76 brightest cluster galaxies (BCGs) in X-ray clusters and shows that the properties of BCGs depend on the X- ray luminosity (L-X) of their host clusters. Unfortunately, the low numbers of nearby clusters in this sample makes it difficult to constrain evolutionary trends. In this letter we extend the Hubble diagram of Burke, Collins & Mann to a total of 155 clusters using new data on 79 BCGs at z less than or equal to 0.1 from the 2MASS extended source catalogue. We show that the major division between BCGs in high- and low-L-X clusters disappears at z less than or equal to 0.1, with BCGs having similar absolute magnitudes independent of the X-ray luminosity of their host clusters. At larger redshifts, the K- band light of BCGs in high-L-X systems is consistent with little or no merging back to z similar to 0.8, whereas BCGs in the low-L-X systems have a different evolutionary history, with many increasing their mass by a factor greater than or equal to4 since z similar or equal to 1. This provides direct evidence of hierarchical merging in a galaxy population.
Free Keywords:galaxies : clusters : general; galaxies : elliptical and lenticular; cD; galaxies : evolution; galaxies : formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Liverpool John Moores Univ, Astrophys Res Inst, Egerton Wharf,; Birkenhead CH41 1LD, Merseyside, England; Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England; Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA; Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA; Univ Edinburgh, Inst Astron, Edinburgh EH9 3NJ, Midlothian, Scotland; Max Planck Inst Extraterr Phys, D-85741 Garching, Germany
Identifiers:ISI:000173587400006
ISSN:0035-8711
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