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Evolution and Impact of Bars over the Last Nine Gyr: Early Results from GEMS

Jogee, Shardha and Conselice, Christopher and Laine, Seppo (2004) Evolution and Impact of Bars over the Last Nine Gyr: Early Results from GEMS. In: Penetrating Bars through Masks of Cosmic Dust: The Hubble Tuning Fork strikes a New Note. Astrophysics and Space Science Library. No.319. Springer , Dordrecht, pp. 291-300. ISBN 978-94-015-7085-5.

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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 ~ 10,000 galaxies with HST-based morphologies and accurate redshifts over the range 0.2–1.3, aims at constraining the evolution and impact of bars over the last 9 Gyr. We present early results indicating that f_(opt) remains ~ constant with a lower limit of ~ 30% over z ~ 0.2–1.3, corresponding to lookback times of ~ 2.5–9 Gyr. The bars detected at z > 0.6 are primarily strong with ellipticities of 0.4–0.8. Remarkably, both 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.

Item Type:Book Section
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URLURL TypeDescription ReadCube access
Conselice, Christopher0000-0003-1949-7638
Laine, Seppo0000-0003-1250-8314
Additional Information:© 2004 Springer Science+Business Media New York. SJ acknowledges support from the National Aeronautics and Space Administration (NASA) under LTSA Grant NAG5-13063 issued through the Office of Space Science, and thanks Paul Eskridge for kindly providing images and parameters for galaxies in the OSU survey.
Funding AgencyGrant Number
Subject Keywords:Galaxy Evolution; Bars; Dynamics; Galaxy Surveys
Series Name:Astrophysics and Space Science Library
Issue or Number:319
Record Number:CaltechAUTHORS:20191127-095615996
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100096
Deposited By: Tony Diaz
Deposited On:27 Nov 2019 18:38
Last Modified:16 Nov 2021 17:51

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