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We use Galaxy Zoo 2 visual classifications to study the morphological signatures of interaction between similar-mass galaxy pairs in the Sloan Digital Sky Survey. We find that many observable features correlate with projected pair…

We study the usage of EfficientNets and their applications to Galaxy Morphology Classification. We explore the usage of EfficientNets into predicting the vote fractions of the 79,975 testing images from the Galaxy Zoo 2 challenge on Kaggle.…

Computer Vision and Pattern Recognition · Computer Science 2021-03-25 Shreyas Kalvankar , Hrushikesh Pandit , Pranav Parwate

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. An artificial neural…

We analyse the relationships between galaxy morphology, colour, environment and stellar mass using data for over 100,000 objects from Galaxy Zoo, the largest sample of visually classified morphologies yet compiled. We conclusively show that…

In order to obtain morphological information of unlabeled galaxies, we present an unsupervised machine-learning (UML) method for morphological classification of galaxies, which can be summarized as two aspects: (1) the methodology of…

Astrophysics of Galaxies · Physics 2022-02-02 C. C. Zhou , Y. Z. Gu , G. W. Fang , Z. S. Lin

There are several supervised machine learning methods used for the application of automated morphological classification of galaxies; however, there has not yet been a clear comparison of these different methods using imaging data, or a…

The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over the approximate redshift (z) range 8--1.5. It will image >250,000 distant galaxies using three…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 Norman A. Grogin , Dale D. Kocevski , S. M. Faber , Henry C. Ferguson , Anton M. Koekemoer , Adam G. Riess , Viviana Acquaviva , David M. Alexander , Omar Almaini , Matthew L. N. Ashby , Marco Barden , Eric F. Bell , Frédéric Bournaud , Thomas M. Brown , Karina I. Caputi , Stefano Casertano , Paolo Cassata , Marco Castellano , Peter Challis , Ranga-Ram Chary , Edmond Cheung , Michele Cirasuolo , Christopher J. Conselice , Asantha Roshan Cooray , Darren J. Croton , Emanuele Daddi , Tomas Dahlen , Romeel Davé , Duília F. de Mello , Avishai Dekel , Mark Dickinson , Timothy Dolch , Jennifer L. Donley , James S. Dunlop , Aaron A. Dutton , David Elbaz , Giovanni G. Fazio , Alexei V. Filippenko , Steven L. Finkelstein , Adriano Fontana , Jonathan P. Gardner , Peter M. Garnavich , Eric Gawiser , Mauro Giavalisco , Andrea Grazian , Yicheng Guo , Nimish P. Hathi , Boris Häussler , Philip F. Hopkins , Jia-Sheng Huang , Kuang-Han Huang , Saurabh W. Jha , Jeyhan S. Kartaltepe , Robert P. Kirshner , David C. Koo , Kamson Lai , Kyoung-Soo Lee , Weidong Li , Jennifer M. Lotz , Ray A. Lucas , Piero Madau , Patrick J. McCarthy , Elizabeth J. McGrath , Daniel H. McIntosh , Ross J. McLure , Bahram Mobasher , Leonidas A. Moustakas , Mark Mozena , Kirpal Nandra , Jeffrey A. Newman , Sami-Matias Niemi , Kai G. Noeske , Casey J. Papovich , Laura Pentericci , Alexandra Pope , Joel R. Primack , Abhijith Rajan , Swara Ravindranath , Naveen A. Reddy , Alvio Renzini , Hans-Walter Rix , Aday R. Robaina , Steven A. Rodney , David J. Rosario , Piero Rosati , Sara Salimbeni , Claudia Scarlata , Brian Siana , Luc Simard , Joseph Smidt , Rachel S. Somerville , Hyron Spinrad , Amber N. Straughn , Louis-Gregory Strolger , Olivia Telford , Harry I. Teplitz , Jonathan R. Trump , Arjen van der Wel , Carolin Villforth , Risa H. Wechsler , Benjamin J. Weiner , Tommy Wiklind , Vivienne Wild , Grant Wilson , Stijn Wuyts , Hao-Jing Yan , Min S. Yun

We analyze morphologies of the host galaxies of 35 X-ray selected active galactic nucleus (AGNs) at $z\sim2$ in the Cosmic Evolution Survey (COSMOS) field using Hubble Space Telescope/WFC3 imaging taken from the Cosmic Assembly…

Astrophysics of Galaxies · Physics 2015-06-18 Lulu Fan , Guanwen Fang , Yang Chen , Jinrong Li , Xuanyi Lv , Kirsten Kraiberg Knudsen , Xu Kong

Using the TNG50 cosmological simulation and observations from the Kilo-Degree Survey (KiDS), we investigate the connection between galaxy mergers and optical morphology in the local Universe over a wide range of galaxy stellar masses…

We conduct a comparison of the merging galaxy populations detected by a sample of visual identification of tidal features around galaxies as well as spectroscopically-detected close pairs of galaxies to determine whether our method of…

We present the first catalog of 67 strong galaxy-galaxy lens candidates discovered in the 1.64 square degree Hubble Space Telescope COSMOS survey. Twenty of these systems display multiple images or strongly curved large arcs. Our initial…

Utilizing a BzK-selected technique, we obtain 14550 star-forming galaxies (sBzKs) and 1763 passive galaxies (pBzKs) at z~2 from the K-selected (K<22.5) catalog in the COSMOS/UltraVISTA field. The differential number counts of sBzKs and…

Astrophysics of Galaxies · Physics 2015-06-03 Guan-Wen Fang , Zhong-Yang Ma , Yang Chen , Xu Kong

We present a study on Spectral Energy Distributions, Morphologies, and star formation for an IRAC-selected extremely red object sample in the GOODS Chandra Deep Field-South. This work was enabled by new HST/WFC3 near-IR imaging from the…

We present an analysis of bar length measurements of 3150 local galaxies in a volume limited sample of low redshift (z < 0.06) disk galaxies. Barred galaxies were initially selected from the Galaxy Zoo 2 project, and the lengths and widths…

We present early results regarding the morphological and structural properties of galaxies seen with the James Webb Space Telescope at $z > 3$ in the Early Release Observations of SMACS 0723, a galaxy cluster at $z=0.39$. We investigate,…

Quantitative morphological classification of galaxies is important for understanding the origin of type frequency and correlations with environment. But galaxy morphological classification is still mainly done visually by dedicated…

The traditional method of morphological classification, by visual inspection of images of uniform quality and by reference to standards for each type, is critically examined. The rate of agreement among traditional morphologists on the…

Astrophysics · Physics 2007-05-23 Stefano Andreon , Emmanuel Davoust

The statistical properties of the ellipticities of galaxy images depend on how galaxies form and evolve, and therefore constrain models of galaxy morphology, which are key to the removal of the intrinsic alignment contamination of…

Cosmology and Nongalactic Astrophysics · Physics 2013-05-28 B. Joachimi , E. Semboloni , P. E. Bett , J. Hartlap , S. Hilbert , H. Hoekstra , P. Schneider , T. Schrabback

We present a quantitative method to classify galaxies, based on multi-wavelength data and elaborated from the properties of nearby galaxies. Our objective is to define an evolutionary method that can be used for low and high redshift…

Astrophysics · Physics 2017-03-29 Sebastien Lauger , Denis Burgarella , Veronique Buat