Results 131 to 140 of about 3,870 (231)

Galaxy Morphological Classification with Zernike Moments and Machine Learning Approaches

The Astrophysical Journal Supplement Series
Classifying galaxies is an essential step for studying their structures and dynamics. Using GalaxyZoo2 (GZ2) fractions thresholds, we collect 545 and 11,735 samples in nongalaxy and galaxy classes, respectively.
Hamed Ghaderi, Nasibe Alipour, Hossein Safari   +2 more
doaj   +1 more source

Spectroscopic studies of supergiant elliptical galaxies [PDF]

, 1985
This investigation reports on detailed spectroscopic observations of four southern supergiant elliptical galaxies. A Fourier Difference method is derived to analyse absorption-line data to obtain velocities, velocity dispersions and line-strengths.
Inglis, Iain, Inglis, I
core  

Elliptical galaxies

, 1989
In this thesis, radial colour and line strength gradients are investigated, and corresponding stellar population gradients are modelled. Together with the gradients, the morphology of the galaxies in optical and near-infrared colours is analyzed. When investigated in detail, every elliptical galaxy has its own special morphology, but nevertheless the ...
openaire   +1 more source

Dusty Feedback from Massive Black Holes in Two Elliptical Galaxies

, 2013
Far-infrared dust emission from elliptical galaxies informs us about galaxy mergers, feedback energy outbursts from supermassive black holes and the age of galactic stars.
Riguccini, L., Brighenti, F., Temi, P., Amblard, A., Mathews, W. G.   +4 more
core   +1 more source

UV upturn of elliptical galaxies

, 2006
We investigate the UV upturn phenomenon of elliptical galaxies by applying the binary model of hot subdwarfs of Han et al. (2002, 2003). Preliminary results show that the model provides a natural explanation for the UV upturn phenomenon and that the ...
Lynas-Gray, AE, Han, Z, Podsiadlowski, Philipp   +2 more
core  

Astronomia ex machina: a history, primer and outlook on neural networks in astronomy. [PDF]

R Soc Open Sci, 2023
Smith MJ, Geach JE.
europepmc   +1 more source

THE AGES OF ELLIPTICAL GALAXIES

, 2008
: We describe evidence supporting the view that the evolution of elliptical galaxies and spiral bulges was more complex and heterogeneous than formerly supposed. They appear to have prolonged, episodic star formation histories, and their dominant stellar
Robert W. O’connell
core  

A Milky Way-like barred spiral galaxy at a redshift of 3. [PDF]

Nature, 2023
Costantin L, Pérez-González PG, Guo Y, Buttitta C, Jogee S, Bagley MB, Barro G, Kartaltepe JS, Koekemoer AM, Cabello C, Corsini EM, Méndez-Abreu J, de la Vega A, Iyer KG, Bisigello L, Cheng Y, Morelli L, Arrabal Haro P, Buitrago F, Cooper MC, Dekel A, Dickinson M, Finkelstein SL, Giavalisco M, Holwerda BW, Huertas-Company M, Lucas RA, Papovich C, Pirzkal N, Seillé LM, Vega-Ferrero J, Wuyts S, Yung LYA.   +32 more
europepmc   +1 more source

A trail of dark-matter-free galaxies from a bullet-dwarf collision. [PDF]

Nature, 2022
van Dokkum P, Shen Z, Keim MA, Trujillo-Gomez S, Danieli S, Dutta Chowdhury D, Abraham R, Conroy C, Kruijssen JMD, Nagai D, Romanowsky A.   +10 more
europepmc   +1 more source

Morphological investigation of elliptical galaxies

, 1985
We describe the two large surface photometry surveys of elliptical galaxies, completed at Mt. Hopkins and Lick observatories. These comprise the largest such surveys of early-type galaxies to this date, and will provide us with a large set of uniform ...
Djorgovski, S., Kent, S., Davis, M.
core