Results 81 to 90 of about 509,719 (323)

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research, EarlyView.
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

EESSI: A cross‐platform ready‐to‐use optimised scientific software stack

Software: Practice and Experience, Volume 53, Issue 1, Page 176-210, January 2023., 2023
Abstract Getting scientific software installed correctly and ensuring it performs well has been a ubiquitous problem for several decades now, which is compounded currently by the changing landscape of computational science with the (re‐)emergence of different microprocessor families, and the expansion to additional scientific domains like artificial ...
Bob Dröge, Victor Holanda Rusu, Kenneth Hoste, Caspar van Leeuwen, Alan O'Cais, Thomas Röblitz   +5 more
wiley   +1 more source

Satellite Galaxy Velocity Dispersions in the SDSS and Modified Gravity Models

Galaxies, 2014
The Sloan Digital Sky Survey (SDSS) provides data on several hundred thousand galaxies. The precise location of these galaxies in the sky, along with information about their luminosities and line-of-sight (Doppler) velocities, allows one to construct a ...
John W. Moffat, Viktor T. Toth
doaj   +1 more source

Is the Hubble Crisis Connected with the Extinction of Dinosaurs?

Universe, 2022
It has recently been suggested that a gravitational transition of the effective Newton’s constant Geff by about 10%, 50–150 Myrs ago could lead to the resolution of both the Hubble crisis and the growth tension of the standard ΛCDM model.
Leandros Perivolaropoulos
doaj   +1 more source

On the dependence of galaxy morphologies on galaxy mergers [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
The distribution of galaxy morphological types is a key test for models of galaxy formation and evolution, providing strong constraints on the relative contribution of different physical processes responsible for the growth of the spheroidal components.
Fabio Fontanot, Fabio Fontanot, Gabriella De Lucia, D. Wilman, Michaela Hirschmann, Rachel S. Somerville, Rahul Kannan, Rahul Kannan, Andrea V. Macciò   +8 more
openaire   +4 more sources

Galaxy interactions II: High density environments [PDF]

, 2011
With the aim to assess the role of dense environments in galaxy interactions, properties we present an analysis of close galaxy pairs in groups and clusters, obtained from the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7). We identified pairs that reside in groups by cross-correlating the total galaxy pair catalogue with the SDSS-DR7 group ...
arxiv   +1 more source

Scintillation Response of 0D Cs3Cu2I5 Thin Layers to Light‐ and Heavy‐Ion Irradiation

Advanced Photonics Research, EarlyView.
Driven by increasing interest in uncovering the remarkable photoluminescence quantum yield of Cs3Cu2I5, polycrystalline thin layers are synthesized to investigate its radioluminescence response to energetic ions. Its spectroscopic capability is assessed in a wide range of ion mass and internal excitation processes are explored.
Mátyás Hunyadi, Attila Csík, Cintia Hajdu, Csaba Janáky, István Rajta, Gergely F. Samu, Lóránt Csige   +6 more
wiley   +1 more source

Optical Emission Lines and the X-Ray Properties of Type 1 Seyfert Galaxies

Open Astronomy, 2011
In this contribution we report on the study of the optical emission lines and X-ray spectra of a sample of Type 1 AGNs, collected from the SDSS database and observed by the XMM-Newton satellite.
La Mura G., Ciroi S., Cracco V., Ilić D., Popović L. Č., Rafanelli P.   +5 more
doaj   +1 more source

Probing the Gas Fueling and Outflows in Nearby AGN with ALMA

Frontiers in Astronomy and Space Sciences, 2017
Feeding and feedback in AGN play a very important role to gain a proper understanding of galaxy formation and evolution. The interaction between activity mechanisms in the nucleus and its influence in the host galaxy are related to the physical processes
Anelise Audibert, Françoise Combes, Françoise Combes, Santiago García-Burillo, Philippe Salomé   +4 more
doaj   +1 more source

Odd Radio Circles and Their Environment

Galaxies, 2021
Odd Radio Circles (ORCs) are unexpected faint circles of diffuse radio emission discovered in recent wide deep radio surveys. They are typically about one arcmin in diameter, and may be spherical shells of synchrotron emission about a million light years
Ray P. Norris, Evan Crawford, Peter Macgregor   +2 more
doaj   +1 more source