Results 101 to 110 of about 507,375 (292)

The chemical evolution of elliptical galaxies with stellar and QSO dust production [PDF]

, 2010
Context. The presence of dust strongly affects the way we see galaxies and also the chemical abundances we measure in gas. It is therefore important to study the chemical evolution of galaxies by taking into account dust evolution. Aims.
A. Pipino, Xi-Long Fan, F. Matteucci, F. Calura, F. Calura, Laura Silva, G. Granato, R. Maiolino   +7 more
semanticscholar   +1 more source

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research, Volume 6, Issue 6, June 2025.
This article uses an optical lens to emulate the gravitational lensing effect and observe the Einstein ring (ER) patterns. The symmetry‐breaking ER, i.e., Einstein cross, is observed utilizing a rotation‐symmetry‐breaking hemi‐ellipsoid lens. Deformed Einstein cross patterns induced by noncollinearly alignment of the light source–lens–observer are ...
Jun‐Liang Duan, Wen Xiao, Minyong Guo, Tong Liu, Huanyang Chen, Jin‐Hui Chen   +5 more
wiley   +1 more source

A Catalog of Photometric Redshift and the Distribution of Broad Galaxy Morphologies

Galaxies, 2018
We created a catalog of photometric redshift of ∼3,000,000 SDSS galaxies annotated by their broad morphology. The photometric redshift was optimized by testing and comparing several pattern recognition algorithms and variable selection strategies, and ...
Nicholas Paul, Nicholas Virag, Lior Shamir   +2 more
doaj   +1 more source

The Central Dark Matter Fraction of Massive Early-Type Galaxies

Frontiers in Astronomy and Space Sciences, 2022
Dark matter (DM) is predicted to be the dominant mass component in galaxies. In the central region of early-type galaxies it is expected to account for a large amount of the total mass, although the stellar mass should still represent the majority of the
C. Tortora, N. R. Napolitano, N. R. Napolitano   +2 more
doaj   +1 more source

Optical-Near Infrared Color Gradients of Elliptical Galaxies and Their Environmental Dependence

, 2005
We have studied the environmental effect on optical-NIR color gradients of 273 nearby elliptical galaxies. Color gradient is a good tool to study the evolutionary history of elliptical galaxies, since the steepness of the color gradient reflects merging ...
Im, Myungshin, Ko, Jongwan
core   +2 more sources

Unveiling the Evolutionary Lineages and Habitat Dynamics of the Monotypic Crowned River Turtle Hardella thurjii (Gray, 1831) (Testudines: Geoemydidae): Strategic Conservation Insights for an Endangered Freshwater Turtle From Southern Asia

Ecology and Evolution, Volume 15, Issue 6, June 2025.
This study provides the first complete mitochondrial genome of the monotypic H. thurjii , sequenced using next‐generation technologies. Additionally, it employs ensemble species distribution modeling to evaluate habitat suitability and shape geometry under both current and projected climatic scenarios.
Imon Abedin, Arunima Singh, Jayaditya Purakayastha, Shailendra Singh, Kulendra Chandra Das, Hyun‐Woo Kim, Hye‐Eun Kang, Shantanu Kundu   +7 more
wiley   +1 more source

STELLAR POPULATIONS OF ELLIPTICAL GALAXIES IN THE LOCAL UNIVERSE [PDF]

, 2010
We study the stellar populations of 1923 elliptical galaxies at z < 0.05 selected from the Sloan Digital Sky Survey as a function of velocity dispersion, σ, and environment.
G. Zhu, M. Blanton, J. Moustakas
semanticscholar   +1 more source

A Population of Compact Elliptical Galaxies Detected with the Virtual Observatory

, 2009
Compact elliptical galaxies are characterized by small sizes and high stellar densities. They are thought to form through tidal stripping of massive progenitors. However, only a handful of them were known, preventing us from understanding the role played
A. Micol, D. Durand, Drinkwater, E. Slezak, F. Durret, I. Chilingarian, S. Dodonov, V. Cayatte, Y. Revaz   +8 more
core   +3 more sources

Evolution of the Color-Magnitude Relation in Galaxy Clusters at z ~1 from the ACS Intermediate Redshift Cluster Survey [PDF]

, 2008
We apply detailed observations of the Color-Magnitude Relation (CMR) with the ACS/HST to study galaxy evolution in eight clusters at z~1. The early-type red sequence is well defined and elliptical and lenticular galaxies lie on similar CMRs.
Arjen Van der Wel, Baldry, Balogh, Bell, Benítez, Bernardi, Blakeslee, Blakeslee, Blakeslee, Bower, Brad P. Holden, Buser, Carlberg, Couch, De Lucia ., Demarco, Desai, Dressler ., Ellis, Ettori, Faber, Ford, Gal, Gal, Gal, Garth D. Illingworth, Giavalisco, Goto, Hogg, Holden, Holden, Holden, Holden, Holland C. Ford, Homeier, Häussler ., Högbom, James G. Bartlett, Jee, Jee, Jee, John P. Blakeslee, Kelson, Kelson, Kocevski, Kodama, Lubin, López-Cruz, Marc Postman, Marijn Franx, Marleau, Maughan, Maíz Apellániz, McIntosh, McIntosh, Mei, Mei, Menci, Moran, Moran, Myungkook J. Jee, Nicole L. Homeier, Overzier, Peng, Pentericci, Peter, Piero Rosati, Poggianti, Poggianti, Postman, Press, Roderik Overzier, Rosati, Rosati ., Schlegel, Scodeggio, Simona Mei, Smith, Spergel, Stanford, Stanford, Stanford, Steidel, Steidel, Tanaka, Thomas, Tran, Tran, van der Wel, van Dokkum, van Dokkum, van Dokkum, van Dokkum, Venemans, Wake ., Willmer, Wu ., York, Zirm   +98 more
core   +4 more sources

The Radio Wave Polarization of Saturn Lightning Observed by Cassini

Journal of Geophysical Research: Space Physics, Volume 130, Issue 6, June 2025.
Abstract We investigate the polarization of the radio waves emitted by lightning in Saturn's atmosphere, which are referred to as SEDs for Saturn Electrostatic Discharges. Using the complete SED data set retrieved by Cassini's RPWS (Radio and Plasma Wave Science) instrument we found that the circular polarization of SEDs below a frequency of 2 MHz ...
G. Fischer, M. Imai, U. Taubenschuss, D. Píša, W. S. Kurth   +4 more
wiley   +1 more source