Galaxy Zoo: CANDELS barred discs and bar fractions
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Author
Simmons, Brooke D.
Melvin, Thomas
Lintott, Chris J.
Masters, Karen L.
Willett, Kyle W.
Keel, William C.
Smethurst, R. J.
Cheung, Edmond
Nichol, Robert C.
Schawinski, Kevin
Rutkowski, Michael
Kartaltepe, Jeyhan S.
Bell, Eric F.
Casteels, Kevin R. V.
Conselice, Christopher J.
Almaini, Omar
Ferguson, Henry C.
Fortson, Lucy
Hartley, William
Kocevski, Dale
Koekemoer, Anton M.
McIntosh, Daniel H.
Mortlock, Alice
Newman, Jeffrey A.
Ownsworth, Jamie
Bamford, Steven P.
Dahlen, Tomas
Faber, Sandra M.
Finkelstein, Steven L.
Fontana, Adriano
Galametz, Audrey
Grogin, N. A.
Grützbauch, Ruth
Guo, Yicheng
Häußler, Boris
Jek, Kian J.
Kaviraj, Sugata
Lucas, Ray A.
Peth, Michael
Salvato, Mara
Wiklind, Tommy
Wuyts, Stijn
Attention
2299/16423
Abstract
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 -3.5 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
Publication date
2014-12-21Published in
Monthly Notices of the Royal Astronomical SocietyPublished version
https://doi.org/10.1093/mnras/stu1817Other links
http://hdl.handle.net/2299/16423Metadata
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