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The morphological classification of galaxies provides vital physical information about the orbital motions of stars in galaxies, and correlates in interesting ways with star formation history, and other physical properties. Galaxy…

Astrophysics of Galaxies · Physics 2025-02-14 Karen Masters

The correlation between a galaxy's morphology and its observed optical spectrum is investigated. As an example, 4000 galaxies from the 2dF Galaxy Redshift Survey, which possess both good quality spectra and have visually determined…

Astrophysics · Physics 2009-11-07 Darren S. Madgwick

We have tested for luminosity, colour and morphology dependence of the degree of filamentarity in seven nearly two dimensional strips from the Sloan Digital Sky Survey Data Release Four (SDSS DR4). The analysis is carried out at various…

Astrophysics · Physics 2009-11-11 Biswajit Pandey , Somnath Bharadwaj

By applying our previously developed two-step scheme for galaxy morphology classification, we present a catalog of galaxy morphology for H-band selected massive galaxies in the COSMOS-DASH field, which includes 17292 galaxies with stellar…

Astrophysics of Galaxies · Physics 2023-07-07 Yao Dai , Jun Xu , Jie Song , Guanwen Fang , Chichun Zhou , Shuo Ba , Yizhou Gu , Zesen Lin , Xu Kong

We compare the stellar population properties in the central regions of visually classified non-starforming spiral and elliptical galaxies from Galaxy Zoo and SDSS DR7. The galaxies lie in the redshift range $0.04<z<0.1$ and have stellar…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Aday R. Robaina , Ben Hoyle , Anna Gallazzi , Raul Jimenez , Arjen van der Wel , Licia Verde

We have conducted a galaxy survey based on low-resolution slitless spectra taken from the automated CFHT-Laval survey. We present redshift distributions for 522 galaxies distributed in 4 distinct regions of the sky. Redshifts are determined…

Astrophysics · Physics 2015-06-24 M. Beauchemin , E. F. Borra

Many statistical methods have been proposed in the last years for analyzing the spatial distribution of galaxies. Very few of them, however, can handle properly the border effects of complex observational sample volumes. In this paper, we…

Astrophysics · Physics 2008-11-26 Enn Saar , Vicent J. Martinez , Jean-Luc Starck , David L. Donoho

The last decade of research on elliptical galaxies has produced a wealth of new information concerning both their detailed structure and their global scaling relations. We review the old and new results about isophote shapes and…

Astrophysics · Physics 2007-05-23 Ralf Bender , Roberto P. Saglia

Morphology is the starting point for understanding galaxies. Elmegreen et al. classified spiral galaxies into flocculent, multiple-arm, and grand-design galaxies based on the regularity of their spiral arm structure. With the release of a…

Astrophysics of Galaxies · Physics 2024-10-11 Junye Wei , Ye Xu , Zehao Lin , Chaojie Hao , Yingjie Li , Dejian Liu , Shuaibo Bian

We applied computer analysis to classify the broad morphological type of ~3,000,000 SDSS galaxies. The catalog provides for each galaxy the DR8 object ID, right ascension, declination, and the certainty of the automatic classification to…

Astrophysics of Galaxies · Physics 2016-04-20 Evan Kuminski , Lior Shamir

Galaxy morphology is one of the most fundamental ways to describe galaxy properties, but the morphology we observe may be affected by wavelength and spatial resolution, which may introduce systematic bias when comparing galaxies at…

Astrophysics of Galaxies · Physics 2023-07-27 Yao Yao , Jie Song , Xu Kong , Guanwen Fang , Hong-Xin Zhang , Xinkai Chen

The distribution of global photometric, spectroscopic, structural and morphological parameters for a well defined sample of 350 nearby galaxies has been examined. The usual trends were recovered demonstrating that E/S0 galaxies are redder,…

Astrophysics · Physics 2009-11-13 S. C. Ellis , S. P. Driver , P. D. Allen , J. Liske , J. Bland-Hawthorn , R. De Propris

We use \sim 2000 galaxies belonging to different environments to show how the fractions of different galaxy morphological types vary with global environment and as function of galaxy stellar mass at low redshift. Considering mass limited…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Rosa Calvi , Bianca M. Poggianti , Giovanni Fasano , Benedetta Vulcani

We test the hypothesis that elliptical galaxies are formed by violent mergers in a universe with hierarchical structure formation. Within the framework of a semi-analytic scheme for galaxy formation, we predict the distribution of…

Astrophysics · Physics 2007-05-23 C. M. Baugh

We used ultraviolet (200 nm) images of the local spiral galaxies M33, M51, M81, M100, M101 to compute morphological parameters of galactic disks at this wavelength : half-light radius $r_{hl}$, surface brightness distributions, asymmetries…

Astrophysics · Physics 2009-11-06 Denis Burgarella , Veronique Buat , Jose Donas , Bruno Milliard , Sandra Chapelon

Morphological classification of galaxies becomes increasingly challenging with redshift. We apply a hybrid supervised-unsupervised method to classify $\sim 14,000$ galaxies in the CANDELS fields at $0.2 \leq z \leq 2.4$ into spheroid, disk,…

Astrophysics of Galaxies · Physics 2025-01-27 I. Kolesnikov , V. M. Sampaio , R. R. de Carvalho , C. Conselice

The morphology of a galaxy has been shown to encode the evolutionary history and correlates strongly with physical properties such as stellar mass, star formation rates and past merger events. While the majority of galaxies in the local…

Astrophysics of Galaxies · Physics 2023-02-23 Clár-Bríd Tohill , Steven Bamford , Christopher Conselice

We present a quantitative morphological analysis of 187 galaxies in a region covering the central 0.28 square degrees of the Coma cluster. Structural parameters from the best-fitting Sersic r^{1/n} bulge plus, where appropriate, exponential…

Astrophysics · Physics 2009-11-10 C. M. Gutierrez , I. Trujillo , J. A. L. Aguerri , A. W. Graham , N. Caon

To gain deeper insights into galaxy evolution and the mechanisms driving transitions between different galaxy morphologies, we analyse the connection between star formation rate and stellar mass for 231 galaxies spanning Hubble types E1-Sdm…

Astrophysics of Galaxies · Physics 2026-02-23 Veselina Kalinova , Keiichi Kodaira , Dario Colombo

We study the relative fraction of galaxy morphological types in clusters, as a function of the projected local galaxy density and different global parameters: cluster projected gas density, cluster projected total mass density , and reduced…

Astrophysics · Physics 2016-08-30 Mariano Dominguez , Hernan Muriel , Diego G. Lambas