Galaxy Zoo: morphological classifications for 120 000 galaxies inHSTlegacy imaging

2016/10/08 by Kyle Willett, Kyle W. Willett, Melanie Galloway +28 · 90 citations
Computer Science · Engineering · Physics and Astronomy · #Advanced Camera for Surveys #Advanced Vision and Imaging #Astronomy #Astrophysics #Bulge #CCD and CMOS Imaging Sensors #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble space telescope #Physics #Redshift #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.1093/mnras/stw2568

published in Monthly Notices of the Royal Astronomical Society 464(4), 4176-4203 (Oxford University Press) · 32 pages, 14 figures. Accepted to MNRAS. Full data tables are available electronically from journal or https://data.galaxyzoo.org

openalex publication_date 2016/10/08 · arxiv created 2016/10/14 · openalex created_date 2016/10/14 · arxiv updated 2016/12/07 · openalex updated_date 2026/08/05

Abstract

We present the data release paper for the Galaxy Zoo: Hubble (GZH) project. This is the third phase in a large effort to measure reliable, detailed morphologies of galaxies by using crowdsourced visual classifications of colour composite images. Images in GZH were selected from various publicly-released Hubble Space Telescope Legacy programs conducted with the Advanced Camera for Surveys, with filters that probe the rest-frame optical emission from galaxies out to z ∼ 1. The bulk of the sample is selected to have m_I814W < 23.5,but goes as faint as m_I814W < 26.8 for deep images combined over 5 epochs. The median redshift of the combined samples is z = 0.9 ± 0.6, with a tail extending out to z ∼ 4. The GZH morphological data include measurements of both bulge- and disk-dominated galaxies, details on spiral disk structure that relate to the Hubble type, bar identification, and numerous measurements of clump identification and geometry. This paper also describes a new method for calibrating morphologies for galaxies of different luminosities and at different redshifts by using artificially-redshifted galaxy images as a baseline. The GZH catalogue contains both raw and calibrated morphological vote fractions for 119,849 galaxies, providing the largest dataset to date suitable for large-scale studies of galaxy evolution out to z ∼ 1.

Citations

• Secular evolution and the assembly of bulges
• Galaxy Zoo: Morphological Classification and Citizen Science
• Astrophysics Source Code Library
• Manifold-driven spirals in N-body barred galaxy simulations
• Preparing Red-Green-Blue (RGB) Images from CCD Data
• The hierarchical origin of galaxy morphologies
• The Accuracy of Morphological Decomposition of Active Galactic Nucleus Host Galaxies
• A New Nonparametric Approach to Galaxy Morphological Classification
• A CATALOG OF DETAILED VISUAL MORPHOLOGICAL CLASSIFICATIONS FOR 14,034 GALAXIES IN THE SLOAN DIGITAL SKY SURVEY
• GEMS Survey Data and Catalog
• A New Approach to Galaxy Morphology. I. Analysis of the Sloan Digital Sky Survey Early Data Release
• Can bars be destroyed by a central mass concentration?-- I. Simulations
• The Evolution of Galaxy Structure Over Cosmic Time
• The Relationship between Stellar Light Distributions of Galaxies and Their Formation Histories
• NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS
• A new classification system for galaxies
• Evolution of the Bar Fraction in COSMOS: Quantifying the Assembly of the Hubble Sequence
• The Mass Assembly Histories of Galaxies of Various Morphologies in the GOODS Fields
• The Hubble Ultra Deep Field
• The green valley is a red herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies★
• CANDELS: THE COSMIC ASSEMBLY NEAR-INFRARED DEEP EXTRAGALACTIC LEGACY SURVEY
• CANDELS: THE COSMIC ASSEMBLY NEAR-INFRARED DEEP EXTRAGALACTIC LEGACY SURVEY—THE HUBBLE SPACE TELESCOPE OBSERVATIONS, IMAGING DATA PRODUCTS, AND MOSAICS
• DAOPHOT - A computer program for crowded-field stellar photometry
• Introducing the Illustris Project: simulating the coevolution of dark and visible matter in the Universe
• Extragalactic nebulae.

Cited by

• Galaxy Zoo: quantitative visual morphological classifications for 48 000 galaxies from CANDELS
• Galaxy Zoo: Morphological Classification of Galaxy Images from the Illustris Simulation
• Deep extragalactic visible legacy survey (DEVILS): stellar mass growth by morphological type since z = 1