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We present a novel approach for measuring the two-point correlation function of galaxies in narrow pencil beam surveys with varying depths. Our methodology is utilized to expand high-redshift galaxy clustering investigations up to $z \sim…

Astrophysics of Galaxies · Physics 2024-08-21 Nicolò Dalmasso , Michele Trenti , Nicha Leethochawalit

We describe application of the `shapelet' linear decomposition of galaxy images to morphological classification using images of $\sim$ 3000 galaxies from the Sloan Digital Sky Survey. After decomposing the galaxies we perform a principal…

Astrophysics · Physics 2009-11-10 Brandon C. Kelly , Timothy A. McKay

The Blanco Cosmology Survey is 4-band (griz) optical-imaging survey that covers ~80 square degrees of the southern sky. The survey consists of two fields roughly centered at (RA,DEC) = (23h,-55d) and (5h30m,-53d) with imaging designed to…

Astrophysics of Galaxies · Physics 2015-06-19 L. E. Bleem , B. Stalder , M. Brodwin , M. T. Busha , M. D. Gladders , F. W. High , A. Rest , R. H. Wechsler

The large-scale structure (LSS) of the Universe is comprised of galaxy filaments, tendrils, and voids. The majority of the Universe's volume is taken up by these voids, which exist as underdense, but not empty, regions. The galaxies found…

Encoded within the morphological structure of galaxies are clues related to their formation and evolutionary history. Recent advances pertaining to the statistics of galaxy morphology include sophisticated measures of concentration (C),…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 K. M. Hambleton , B. K. Gibson , C. B. Brook , G. S. Stinson , C. J. Conselice , J. Bailin , H. Couchman , J. Wadsley

Using a sample of 472 local Universe (z<0.06) galaxies in the stellar mass range 10.25 < log M*/M_sun < 10.75, we explore the variation in galaxy structure as a function of morphology and galaxy colour. Our sample of galaxies is sub-divided…

(ABRIDGED) Motivated by the desire to reliably and automatically classify structure of thousands of COSMOS galaxies, we present ZEST, the Zurich Estimator of Structural Types. To classify galaxy structure, ZEST uses: (i) Five non-parametric…

In this work, decision tree learning algorithms and fuzzy inferencing systems are applied for galaxy morphology classification. In particular, the CART, the C4.5, the Random Forest and fuzzy logic algorithms are studied and reliable…

Astrophysics of Galaxies · Physics 2010-06-02 Adam Gauci , Kristian Zarb Adami , John Abela

With a primary goal of conducting precision weak lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by the Hubble Space Telescope (HST) to date using the Advanced Camera for Surveys (ACS).…

We present the methodology for a joint cosmological analysis of weak gravitational lensing from the fourth data release of the ESO Kilo-Degree Survey (KiDS-1000) and galaxy clustering from the partially overlapping BOSS and 2dFLenS surveys.…

(abridged) In the last decade, the advent of enormous galaxy surveys has motivated the development of automated morphological classification schemes to deal with large data volumes. Existing automated schemes can successfully distinguish…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Judy Y. Cheng , S. M. Faber , Luc Simard , Genevieve J. Graves , Eric D. Lopez , Renbin Yan , Michael C. Cooper

This paper describes the Hubble Space Telescope imaging data products and data reduction procedures for the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). This survey is designed to document the evolution of galaxies…

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

The present paper presents a discussion of classification systems for galaxies, with special emphasis on possible modifications of the Hubble "tuning fork" diagram, and on galaxy types not included in Hubble's original scheme. Hubble's…

Astrophysics · Physics 2009-10-30 Sidney van den Bergh

Using traditional morphological classifications of galaxies in 10 intermediate-redshift (z~0.5) clusters observed with WFPC-2 on the Hubble Space Telescope, we derive relations between morphology and local galaxy density similar to that…

We present in this paper a new three-dimensional galaxy classification system designed to account for the diversity of galaxy properties in the nearby universe. To construct this system we statistically analyse a sample of >22,000 galaxies…

Astrophysics · Physics 2009-11-11 Christopher J. Conselice

Galaxy morphology is a fundamental quantity, that is essential not only for the full spectrum of galaxy-evolution studies, but also for a plethora of science in observational cosmology. While a rich literature exists on…

Astrophysics of Galaxies · Physics 2020-01-08 Garreth Martin , Sugata Kaviraj , Alex Hocking , Shaun C. Read , James E. Geach

We present results from a search for gravitationally lensed galaxies present in the Hubble Space Telescope (HST)/Wide Field Camera-3 (WFC3) images of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). We present one…

We present a morphological study of galaxies in the A901/902 supercluster from the COMBO-17 survey. A total of 570 galaxies with photometric redshifts in the range 0.155 < z_phot < 0.185 are visually classified by three independent…

Astrophysics · Physics 2009-06-23 K. P. Lane , M. E. Gray , A. Aragon-Salamanca , C. Wolf , K. Meisenheimer

Strong gravitational lenses are a rare and instructive type of astronomical object. Identification has long relied on serendipity, but different strategies -- such as mixed spectroscopy of multiple galaxies along the line of sight, machine…