Results 121 to 130 of about 2,756,668 (275)

The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration

The Astrophysical Journal, 2023
We investigate the role of halo concentration in the formation of intracluster light (ICL) in galaxy groups and clusters, as predicted by a state-of-the-art semianalytic model of galaxy formation, coupled with a set of high-resolution dark-matter-only ...
Emanuele Contini, Seyoung Jeon, Jinsu Rhee, San Han, Sukyoung K. Yi   +4 more
doaj   +1 more source

A New Look at Poor Groups of Galaxies [PDF]

arXiv, 1999
We use a new fiber spectroscopic survey of 12 nearby, poor groups of galaxies to examine the dynamics and evolution of galaxies in these common, but poorly studied, environments. Some of our conclusions are: (1) The nine groups in our sample with diffuse X-ray emission are in fact bound systems with at least 20-50 group members with absolute magnitudes
arxiv  

Revisiting the Cooling Flow Problem in Galaxies, Groups, and Clusters of Galaxies [PDF]

, 2018
We present a study of 107 galaxies, groups, and clusters spanning ∼3 orders of magnitude in mass, ∼5 orders of magnitude in central galaxy star formation rate (SFR), ∼4 orders of magnitude in the classical cooling rate ( ) of the intracluster medium (ICM)
M. McDonald, M. Gaspari, B. McNamara, G. Tremblay   +3 more
semanticscholar   +1 more source

The galaxy environment in GAMA G3C groups using the Kilo Degree Survey Data Release 3 [PDF]

, 2018
We aim to investigate the galaxy environment in GAMA Galaxy Groups Catalogue (G3C) using a volume-limited galaxy sample from the Kilo Degree Survey Data Release 3.
Bilicki, M., Brouwer, M. M., Buddelmeijer, H., Costa-Duarte, M. V., de Jong, J. T. A., Getman, F., Grado, A., Kleijn, G. V., Kuijken, K., Molino, A., Napolitano, N., Puddu, E., Radovich, M., Sodré Jr., L., Vakili, M., Viola, M.   +15 more
core   +5 more sources

The baryon content of groups and clusters of galaxies in the FABLE simulations [PDF]

, 2019
We study the gas and stellar mass content of galaxy groups and clusters in the FABLE suite of cosmological hydrodynamical simulations, including the evolution of their central brightest cluster galaxies (BCGs), satellite galaxies and intracluster light ...
Nicholas A Henden, E. Puchwein, D. Sijacki   +2 more
semanticscholar   +1 more source

Learning by helping: Evidence from Chinese brokerages' community CSR

Strategic Management Journal, EarlyView.
Abstract Research Summary We propose that firms engaging in community corporate social responsibility (CSR) can acquire valuable local knowledge that improves their core operations. We test our proposition leveraging a unique context‐the Securities Association of China's pairing assistance scheme under the country's targeted poverty alleviation program.
Jingyuan Li, Yong H. Kim, Jose Uribe
wiley   +1 more source

An environmental Butcher-Oemler effect in intermediate redshift X-ray clusters

, 2010
We present uniform CFHT Megacam g and r photometry for 34 X-ray selected galaxy clusters drawn from the X-ray Multi-Mirror (XMM) Large Scale Structure (LSS) survey and the Canadian Cluster Comparison Project (CCCP). The clusters possess well determined X-
Abadi, Andreon, Andreon, Balogh, Barger, Berrier, Bertin, Bildfell, Blanton, Butcher, Chung, Cox, De Propris, Di Matteo, Dressler, Dressler, Duc, Ellingson, Fairley, Finoguenov, Geach, Gunn, H. Hoekstra, Haines, Hansen, Hoekstra, Hopkins, J. P. Willis, Kawata, Kinney, Kodama, Li, Loh, M. Pierre, Makino, Margoniner, McCarthy, Moore, Oemler, Pacaud, Pimbblet, Poggianti, Poggianti, S. A. Urquhart, Saintonge, Treu, Van Dokkum, Wake, Willis, Wolf   +49 more
core   +1 more source

Radio galaxy feedback in X-ray selected groups from COSMOS: the effect on the ICM [PDF]

, 2010
We quantify the importance of the mechanical energy released by radio-galaxies inside galaxy groups. We use scaling relations to estimate the mechanical energy released by 16 radio-AGN located inside X-ray detected galaxy groups in the COSMOS field.
A. Finoguenov, A. M. Koekemoer, A. Oklopčić, Bîrzan, Bîrzan, Condon, D. B. Sanders, D. Pierini, D. Thompson, De Young, Donahue, Drory, Dunkley, E. Schinnerer, Finoguenov, G. W. Pratt, G. Zamorani, Giodini, Gitti, H. Boehringer, Heinz, Ilbert, J. S. Kartaltepe, L. Bîrzan, Leauthaud, Lin, M. Salvato, Markevitch, Peterson, Pratt, Puchwein, R. Massey, Reiprich, S. Giodini, Salvato, Schinnerer, Scoville, Short, Skrutskie, Smolčić, Smolčić, Sun, V. Smolčić, Voit, Wright   +44 more
core   +4 more sources

Shaken Snow Globes: Kinematic Tracers of the Multiphase Condensation Cascade in Massive Galaxies, Groups, and Clusters [PDF]

, 2017
We propose a novel method to constrain turbulence and bulk motions in massive galaxies, galaxy groups, and clusters, exploring both simulations and observations.
M. Gaspari, M. McDonald, S. Hamer, F. Brighenti, P. Temi, M. Gendron-Marsolais, J. Hlavacek-Larrondo, A. Edge, Norbert Werner, Norbert Werner, Norbert Werner, P. Tozzi, M. Sun, James M. Stone, G. Tremblay, M. Hogan, D. Eckert, S. Ettori, Heng Yu, V. Biffi, V. Biffi, S. Planelles   +21 more
semanticscholar   +1 more source

Machine learning approach of multi‐RAT selection for travelling users in 5G NSA networks

IET Networks, EarlyView.
The authors present RAT selection algorithm for efficient resource allocation for public bus travelling user(s), utilising live data from multiple 5G NSA base stations. Models of the supervised machine learning algorithms: SVM, DNN and XGBoost were deployed for implementation to predict or select the appropriate RAT between 4G and 5G RATs.
Nurudeen O. Salau, Sanaullah Manzoor, Muhammad Z. Shakir   +2 more
wiley   +1 more source