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20 April 2024

» arxiv » astro-ph/0408267

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Evolution and Impact of Bars over the Last Eight Billion Years: Early Results from GEMS
S. Jogee ; F. D. Barazza ; H.-W. Rix ; J. Davies ; I. Heyer ; M. Barden ; S. V.W. Beckwith ; E. F. Bell ; A. Borch ; J. A. R. Caldwell ; C. Conselice ; B. Haussler ; C. Heymans ; K. Jahnke ; J. H. Knapen ; S. Laine ; G. M. Lubell ; B. Mobasher ; D. H. McIntosh ; K. Meisenheimer ; C. Y. Peng ; S. Ravindranath ; S. F. Sanchez ; I. Shlosman ; R. S. Somerville ; L. Wisotzki ; C. Wolf ;
Date:	14 Aug 2004
Subject:	astro-ph
Abstract:	Bars drive the dynamical evolution of disk galaxies by redistributing mass and angular momentum, and they are ubiquitous in present-day spirals. Early studies of the Hubble Deep Field reported a dramatic decline in the rest-frame optical bar fraction f_opt to below 5% at redshifts z>0.7, implying that disks at these epochs are fundamentally different from present-day spirals. The GEMS bar project, based on ~8300 galaxies with HST-based morphologies and accurate redshifts over the range 0.2-1.1, aims at constraining the evolution and impact of bars over the last 8 Gyr. We present early results indicating that f_opt remains nearly constant at ~30% over the range z=0.2-1.1,corresponding to lookback times of ~2.5-8 Gyr. The bars detected at z>0.6 are primarily strong with ellipticities of 0.4-0.8. Remarkably, the bar fraction and range of bar sizes observed at z>0.6 appear to be comparable to the values measured in the local Universe for bars of corresponding strengths. Implications for bar evolution models are discussed.
Source:	arXiv, astro-ph/0408267
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