Galaxy Zoo: bar lengths in local disc galaxies by Hoyle, B, Masters, K, Nichol, R, Edmondson, E, Smith, A, Lintott, C, Scranton, R, Bamford, S, Schawinski, K, Thomas, D

“…Barred galaxies were initially selected from the Galaxy Zoo 2 project, and the lengths and widths of the bars were manually drawn by members of the Galaxy Zoo community using a Google Maps interface. …”

Galaxy Zoo: Bulgeless Galaxies With Growing Black Holes by Simmons, B, Lintott, C, Schawinski, K, Moran, E, Han, A, Kaviraj, S, Masters, K, Urry, C, Willett, K, Bamford, S, Nichol, R

“…Here we present an initial sample of 13 AGN in massive (M_* >~ 1e10 M_sun) bulgeless galaxies -- which lack the classical bulges believed inevitably to result from mergers -- selected from the Sloan Digital Sky Survey using visual classifications from Galaxy Zoo. Parametric morphological fitting confirms the host galaxies lack classical bulges; any contributions from pseudobulges are very small (typically < 5%). …”

Galaxy Zoo: kinematics of strongly and weakly barred galaxies by Géron, T, Smethurst, RJ, Lintott, C, Kruk, S, Masters, KL, Simmons, B, Mantha, KB, Walmsley, M, Garma-Oehmichen, L, Drory, N, Lane, RR

“…Our sample, which is divided between strongly and weakly barred galaxies identified via Galaxy Zoo, is the largest that this method has been applied to. …”

Galaxy Zoo: The fraction of merging galaxies in the SDSS and their morphologies by Darg, D, Kaviraj, S, Lintott, C, Schawinski, K, Sarzi, M, Bamford, S, Silk, J, Proctor, R, Andreescu, D, Murray, P, Nichol, R, Raddick, M, Slosar, A, Szalay, A, Thomas, D, Vandenberg, J

“…We present the largest, most homogeneous catalogue of merging galaxies in the nearby Universe obtained through the Galaxy Zoo project - an interface on the World Wide Web enabling large-scale morphological classification of galaxies through visual inspection of images from the Sloan Digital Sky Survey (SDSS). …”

Galaxy Zoo: the interplay of quenching mechanisms in the group environment by Smethurst, R, Lintott, C, Bamford, S, Hart, R, Kruk, S, Masters, K, Nichol, R, Simmons, B

“…Here we investigate the detailed morphological structures and star formation histories of a sample of SDSS group galaxies with both classifications from Galaxy Zoo 2 and NUV detections in GALEX. We use the optical and NUV colours to infer the quenching time and rate describing a simple exponentially declining SFH for each galaxy, along with a control sample of field galaxies. …”

Galaxy Zoo: Reproducing Galaxy Morphologies Via Machine Learning by Banerji, M, Lahav, O, Lintott, C, Abdalla, F, Schawinski, K, Bamford, S, Andreescu, D, Murray, P, Raddick, M, Slosar, A, Szalay, A, Thomas, D, Vandenberg, J

“…We present morphological classifications obtained using machine learning for objects in SDSS DR6 that have been classified by Galaxy Zoo into three classes, namely early types, spirals and point sources/artifacts. …”

Galaxy Zoo: Finding offset discs and bars in SDSS galaxies by Kruk, S, Lintott, C, Simmons, B, Bamford, S, Cardamone, C, Fortson, L, Hart, R, Häußler, B, Masters, K, Nichol, R, Schawinski, K, Smethurst, R

“…We use multi-wavelength SDSS images and Galaxy Zoo morphologies to identify a sample of $\sim$$270$ late-type galaxies with an off-centre bar. …”

Galaxy Zoo: star-formation versus spiral arm number by Hart, R, Bamford, S, Casteels, K, Kruk, S, Lintott, C, Masters, K

“…We investigate how these different arm types are related to a galaxy's star-formation and gas properties by making use of visual spiral arm number measurements from Galaxy Zoo 2. We combine UV and mid-IR photometry from GALEX and WISE to measure the rates and relative fractions of obscured and unobscured star formation in a sample of low-redshift SDSS spirals. …”

Galaxy Zoo: The Environmental Dependence of Bars and Bulges in Disc Galaxies by Skibba, R, Masters, K, Nichol, R, Zehavi, I, Hoyle, B, Edmondson, E, Bamford, S, Cardamone, C, Keel, W, Lintott, C, Schawinski, K

“…We present an analysis of the environmental dependence of bars and bulges in disc galaxies, using a volume-limited catalogue of 15810 galaxies at z<0.06 from the Sloan Digital Sky Survey with visual morphologies from the Galaxy Zoo 2 project. We find that the likelihood of having a bar, or bulge, in disc galaxies increases when the galaxies have redder (optical) colours and larger stellar masses, and observe a transition in the bar and bulge likelihoods, such that massive disc galaxies are more likely to host bars and bulges. …”

Galaxy Zoo: The environmental dependence of bars and bulges in disc galaxies by Skibba, R, Masters, K, Nichol, R, Zehavi, I, Hoyle, B, Edmondson, E, Bamford, S, Cardamone, C, Keel, W, Lintott, C, Schawinski, K

“…We present an analysis of the environmental dependence of bars and bulges in disc galaxies, using a volume-limited catalogue of 15810 galaxies at z < 0.06 from the Sloan Digital Sky Survey with visual morphologies from the Galaxy Zoo 2 project. We find that the likelihood of having a bar, or bulge, in disc galaxies increases when the galaxies have redder (optical) colours and larger stellar masses, and observe a transition in the bar and bulge likelihoods at M *= 2 × 10 10M ⊙, such that massive disc galaxies are more likely to host bars and bulges. …”

Galaxy Zoo : 'Hanny's Voorwerp', a quasar light echo? by Lintott, C, Schawinski, K, Keel, W, Arkel, H, Bennert, N, Edmondson, E, Thomas, D, Smith, D, Herbert, P, Jarvis, M, Virani, S, Andreescu, D, Bamford, S, Land, K, Murray, P, Nichol, R, Raddick, J, Slosar, A, Szalay, A, Vandenberg, J

“…We report the discovery of an unusual object near the spiral galaxy IC 2497, discovered by visual inspection of the Sloan Digital Sky Survey (SDSS) as part of the Galaxy Zoo project. The object, known as Hanny's Voorwerp, is bright in the SDSS g band due to unusually strong OIII 4959-5007 emission lines. …”

Reanalysis of the Spin Direction Distribution of Galaxy Zoo SDSS Spiral Galaxies by Darius Mcadam, Lior Shamir

“…Here, we follow one of the previous experiments by applying the SpArcFiRe algorithm to annotate the spin directions in an original dataset of Galaxy Zoo 1. The annotation of the galaxy spin directions is carried out after the first step of selecting the spiral galaxies in three different manners: manual analysis by Galaxy Zoo classifications, by a model-driven computer analysis, and with no selection of spiral galaxies. …”
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Galaxy Zoo: Morphological Classification of Galaxy Images from the Illustris Simulation by Dickinson, Hugh, Fortson, Lucy, Lintott, Chris, Scarlata, Claudia, Willett, Kyle, Bamford, Steven, Beck, Melanie, Cardamone, Carolin, Galloway, Melanie, Simmons, Brooke, Keel, William, Kruk, Sandor, Masters, Karen, Snyder, Gregory F., Vogelsberger, Mark, Torrey, Paul A.

“…This paper tests the degree to which Illustris achieves this goal across a diverse population of galaxies using visual morphologies derived from Galaxy Zoo citizen scientists. Morphological classifications provided by these volunteers for simulated galaxies are compared with similar data for a compatible sample of images drawn from the Sloan Digital Sky Survey (SDSS) Legacy Survey. …”
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Galaxy Zoo: Morphological classification of galaxy images from the Illustris simulation by Dickinson, H, Fortson, L, Lintott, C, Scarlata, C, Willett, K, Bamford, S, Beck, M, Cardamone, C, Galloway, M, Simmons, B, Keel, W, Kruk, S, Masters, K, Vogelsberger, M, Torrey, P, Snyder, G

“…This paper tests how well Illustris achieves this goal across a diverse population of galaxies using visual morphologies derived from Galaxy Zoo citizen scientists. Morphological classifications provided by volunteers for simulated galaxies are compared with similar data for a compatible sample of images drawn from the SDSS Legacy Survey. …”

Galaxy Zoo: A Catalog of Overlapping Galaxy Pairs for Dust Studies by Keel, W, Manning, A, Holwerda, B, Mezzoprete, M, Lintott, C, Schawinski, K, Gay, P, Masters, K

“…We present a catalog of 1990 such galaxy pairs selected from the Sloan Digital Sky Survey (SDSS) by volunteers of the Galaxy Zoo project. We highlight subsamples which are particularly useful for retrieving such properties of the dust distribution as UV extinction, the extent perpendicular to the disk plane, and extinction in the inner parts of disks. …”

Galaxy zoo: Probabilistic morphology through Bayesian CNNs and active learning by Walmsley, M, Smith, L, Lintott, C, Gal, Y, Bamford, S, Dickinson, H, Fortson, L, Kruk, S, Masters, K, Scarlata, C, Simmons, B, Smethurst, R, Wright, D

“…We use Bayesian convolutional neural networks and a novel generative model of Galaxy Zoo volunteer responses to infer posteriors for the visual morphology of galaxies. …”

Radio Galaxy Zoo: A search for hybrid morphology radio galaxies by Kapiñska, A, Terentev, I, Terentev, W, Shabala, S, Shabala, A, Rudnick, L, Storer, L, Banfield, J, Willett, K, Willett, F, Willett, C, Willett, A, Middelberg, E, Norris, R, Norris, K, Seymour, N, Simmons, B

“…To enhance the statistical analysis of HyMoRS, we embarked on a largescale search of these sources within the international citizen science project, Radio Galaxy Zoo (RGZ). Here, we present 25 new candidate hybrid morphology radio galaxies. …”

Galaxy Zoo: Major galaxy mergers are not a significant quenching pathway by Weigel, A, Schawinski, K, Caplar, N, Carpineti, A, Hart, R, Kaviraj, S, Keel, W, Kruk, S, Lintott, C, Nichol, R, Simmons, B, Smethurst, R

“…In addition to SDSS DR7 and Galaxy Zoo 1 data, we use samples of visually selected major galaxy mergers and post-merger galaxies. …”

Tasking Citizen Scientists from Galaxy Zoo to Model Galaxy Collisions by Wallin, J, Holincheck, A, Borne, K, Lintott, C, Smith, A, Bamford, S, Fortson, L

Galaxy Zoo: A sample of blue early-type galaxies at low redshift by Schawinski, K, Lintott, C, Thomas, D, Sarzi, M, Andreescu, D, Bamford, S, Kaviraj, S, Khochfar, S, Land, K, Murray, P, Nichol, R, Raddick, M, Slosar, A, Szalay, A, VandenBerg, J, Yi, S

“…They are identified by their visual morphology as provided by Galaxy Zoo for SDSS DR6 and their u-r colour. We select a volume-limited sample in the redshift range 0.02 < z < 0.05, corresponding to luminosities of approximately L* and above, and with u-r colours significantly bluer than the red sequence. …”