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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2017

Galaxy Zoo: quantitative visual morphological classifications for 48 000 galaxies from CANDELS

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B. D. Simmons
  • Function : Author
Chris Lintott
  • Function : Author
Kyle W. Willett
  • Function : Author
Karen L. Masters
  • Function : Author
Jeyhan S. Kartaltepe
  • Function : Author
Boris Häussler
  • Function : Author
Sugata Kaviraj
Coleman Krawczyk
  • Function : Author
S. J. Kruk
  • Function : Author
Daniel H. Mcintosh
  • Function : Author
R. J. Smethurst
  • Function : Author
Robert C. Nichol
  • Function : Author
Claudia Scarlata
Kevin Schawinski
  • Function : Author
Christopher J. Conselice
  • Function : Author
Omar Almaini
  • Function : Author
Henry C. Ferguson
  • Function : Author
Lucy Fortson
  • Function : Author
William Hartley
  • Function : Author
Dale Kocevski
  • Function : Author
Anton M. Koekemoer
  • Function : Author
Alice Mortlock
  • Function : Author
Jeffrey A. Newman
  • Function : Author
Steven P. Bamford
  • Function : Author
N. A. Grogin
  • Function : Author
Ray A. Lucas
  • Function : Author
Elizabeth Mcgrath
  • Function : Author
Michael Peth
  • Function : Author
Zachary Rizer
  • Function : Author
Stijn Wuyts
  • Function : Author
Guillermo Barro
  • Function : Author
Eric F. Bell
  • Function : Author
Marco Castellano
  • Function : Author
Tomas Dahlen
  • Function : Author
Avishai Dekel
  • Function : Author
Jamie Ownsworth
  • Function : Author
Sandra M. Faber
  • Function : Author
Steven L. Finkelstein
  • Function : Author
Adriano Fontana
  • Function : Author
Audrey Galametz
  • Function : Author
Ruth Grützbauch
  • Function : Author
David Koo
  • Function : Author
Jennifer Lotz
  • Function : Author
Bahram Mobasher
  • Function : Author
Mark Mozena
  • Function : Author
Mara Salvato
  • Function : Author
Tommy Wiklind
  • Function : Author

Abstract

We present quantified visual morphologies of approximately 48 000 galaxies observed in three Hubble Space Telescope legacy fields by the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and classified by participants in the Galaxy Zoo project. 90 per cent of galaxies have z ≤ 3 and are observed in rest-frame optical wavelengths by CANDELS. Each galaxy received an average of 40 independent classifications, which we combine into detailed morphological information on galaxy features such as clumpiness, bar instabilities, spiral structure, and merger and tidal signatures. We apply a consensus-based classifier weighting method that preserves classifier independence while effectively down-weighting significantly outlying classifications. After analysing the effect of varying image depth on reported classifications, we also provide depth-corrected classifications which both preserve the information in the deepest observations and also enable the use of classifications at comparable depths across the full survey. Comparing the Galaxy Zoo classifications to previous classifications of the same galaxies shows very good agreement; for some applications, the high number of independent classifications provided by Galaxy Zoo provides an advantage in selecting galaxies with a particular morphological profile, while in others the combination of Galaxy Zoo with other classifications is a more promising approach than using any one method alone. We combine the Galaxy Zoo classifications of `smooth' galaxies with parametric morphologies to select a sample of featureless discs at 1 ≤ z ≤ 3, which may represent a dynamically warmer progenitor population to the settled disc galaxies seen at later epochs.
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Dates and versions

insu-03666211 , version 1 (12-05-2022)

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B. D. Simmons, Chris Lintott, Kyle W. Willett, Karen L. Masters, Jeyhan S. Kartaltepe, et al.. Galaxy Zoo: quantitative visual morphological classifications for 48 000 galaxies from CANDELS. Monthly Notices of the Royal Astronomical Society, 2017, 464, pp.4420-4447. ⟨10.1093/mnras/stw2587⟩. ⟨insu-03666211⟩
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