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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421622.0, MPI für Astronomie / Publikationen_mpia
Frequency and impact of galaxy mergers and interactions over the last 7 Gyr
Authors:Jogee, S.; Miller, S.; Penner, K.; Bell, E. F.; Conselice, C.; Skelton, R. E.; Somerville, R. S.; Rix, H. W.; Barazza, F. D.; Barden, M.; Borch, A.; Beckwith, S. V.; Caldwell, J. A. R.; Häussler, B.; Heymans, C.; Jahnke, K.; McIntosh, D.; Meisenheimer, K.; Papovich, C.; Peng, C. Y.; Robaina, A.; Sanchez, S.; Wisotzki, L.; Wolf, C.
Place of Publication:San Francisco
Date of Publication (YYYY-MM-DD):2008
Title of Proceedings:Formation and Evolution of Galaxy Disks
Start Page:337
End Page:340
Title of Series:ASP Conf. Ser.
Volume (in Series):396
Name of Conference/Meeting:Astronomical Society of the Pacific Conference Series
Review Status:not specified
Audience:Not Specified
Abstract / Description:We explore the history and impact of galaxy mergers and interactions over z Ëœ 0.24-0.80, based on HST ACS, Combo-17, and Spitzer 24 mum data of Ëœ4500 galaxies in the GEMS survey. Using visual and quantitative parameters, we identify galaxies with strong distortions indicative of recent strong interactions and mergers versus normal galaxies (E/S0, Sa, Sb-Sc, Sd/Irr). Our preliminary results are: (1) The observed fraction F of strongly disturbed systems among high mass (M >= 2.5 × 10^{10} M_{o}) galaxies is Ëœ9% to 12% in every Gyr bin over zËœ0.24-0.80. The corresponding merger rate is Ëœ a few × 10^{-4} galaxies Gyr^{-1} Mpc^{-3}. The fraction F shows fair agreement with the merger fraction of mass ratio >= 1:10 predicted by several LambdaCDM-based simulations. (2) For M >= 1.0 × 10^{9} M_{o} systems, the average star formation rate (SFR) of strongly disturbed systems is only modestly enhanced with respect to normal galaxies. In fact, over z Ëœ 0.24-0.8, strongly disturbed systems only account for a small fraction (<30%) of the total SFR density. This suggest that the behavior of the cosmic SFR density over zËœ0.24-0.80 is predominantly shaped by normal galaxies.
Comment of the Author/Creator:Date: 2008, October 1, 2008
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008ASPC..396..337J [ID No:1]
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