Galaxy Zoo:CANDELS barred discs and bar fractions

Simmons, B. D. and Melvin, Thomas and Lintott, Chris and Masters, Karen L. and Willett, Kyle W. and Keel, William C. and Smethurst, R. J. and Cheung, Edmond and Nichol, Robert C. and Schawinski, Kevin and Rutkowski, Michael and Kartaltepe, Jeyhan S. and Bell, Eric F. and Casteels, Kevin R. V. and Conselice, Christopher J. and Almaini, Omar and Ferguson, Henry C. and Fortson, Lucy and Hartley, William and Kocevski, Dale and Koekemoer, Anton M. and Mcintosh, Daniel H. and Mortlock, Alice and Newman, Jeffrey A. and Ownsworth, Jamie and Bamford, Steven and Dahlen, Tomas and Faber, Sandra M. and Finkelstein, Steven L. and Fontana, Adriano and Galametz, Audrey and Grogin, N. A. and Grützbauch, Ruth and Guo, Yicheng and Häußler, Boris and Jek, Kian J. and Kaviraj, Sugata and Lucas, Ray A. and Peth, Michael and Salvato, Mara and Wiklind, Tommy and Wuyts, Stijn (2014) Galaxy Zoo:CANDELS barred discs and bar fractions. Monthly Notices of the Royal Astronomical Society, 445 (4). pp. 3466-3474. ISSN 0035-8711

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The formation of bars in disc galaxies is a tracer of the dynamical maturity of the population. Previous studies have found that the incidence of bars in discs decreases from the local Universe to z ∼ 1, and by z > 1 simulations predict that bar features in dynamically mature discs should be extremely rare. Here, we report the discovery of strong barred structures in massive disc galaxies at z ∼ 1.5 in deep rest-frame optical images from the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey. From within a sample of 876 disc galaxies identified by visual classification in Galaxy Zoo, we identify 123 barred galaxies. Selecting a subsample within the same region of the evolving galaxy luminosity function (brighter than L*), we find that the bar fraction across the redshift range 0.5 ≤ z ≤ 2 ( fbar=10.7+6.3−3.5fbar=10.7−3.5+6.3 per cent after correcting for incompleteness) does not significantly evolve. We discuss the implications of this discovery in the context of existing simulations and our current understanding of the way disc galaxies have evolved over the last 11 billion years.

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Journal Article
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Monthly Notices of the Royal Astronomical Society
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21 Sep 2018 14:34
Last Modified:
17 Sep 2023 02:21