Results 131 to 140 of about 371,979 (299)

Constraints on Nonthermal Pressure at Galaxy Cluster Outskirts from a Joint SPT and XMM-Newton Analysis

open access: yesThe Astrophysical Journal Letters
We present joint South Pole Telescope and XMM-Newton observations of eight massive galaxy clusters (0.8–2 × 10 ^15 M _⊙ ) spanning a redshift range of 0.16–0.35. Employing a novel Sunyaev–Zel’dovich + X-ray fitting technique, we effectively constrain the
Arnab Sarkar   +13 more
doaj   +1 more source

Formation Scenarios for Globular Clusters and Their Host Galaxies [PDF]

open access: yesarXiv, 2001
This review focuses on how galaxies and their globular cluster systems form. I first discuss the now fairly convincing evidence that some globular clusters form in galaxy starbursts/mergers. One way these observations are valuable is they place important constraints on the physics of the formation of globular clusters.
arxiv  

Similarity Assessment of the Engineering Concepts: Decision‐Making Support and Metrics

open access: yesSystems Engineering, EarlyView.
ABSTRACT The new product development (NPD) process is a systematic approach to bring new products and innovations to market. Nowadays, this process is affected by a number of influencing factors associated with the fast‐paced technological changes. One of those factors is the distributed design nature of product development activities: team members are
Yaroslav Menshenin   +3 more
wiley   +1 more source

AMICO galaxy clusters in KiDS-DR3: sample properties and selection function

open access: yes, 2018
We present the first catalogue of galaxy cluster candidates derived from the third data release of the Kilo Degree Survey (KiDS-DR3). The sample of clusters has been produced using the Adaptive Matched Identifier of Clustered Objects (AMICO) algorithm ...
Bardelli, Sandro   +7 more
core   +1 more source

On the Particle Acceleration Mechanisms in a Double Radio Relic Galaxy Cluster, Abell 1240

open access: yesThe Astrophysical Journal
We present a 368 ks deep Chandra observation of Abell 1240, a binary merging galaxy cluster at a redshift of 0.195 with two brightest cluster galaxies that may have passed each other 0.3 Gyr ago.
Arnab Sarkar   +14 more
doaj   +1 more source

Galaxy clusters enveloped by vast volumes of relativistic electrons. [PDF]

open access: yesNature, 2022
Cuciti V   +14 more
europepmc   +1 more source

Wide field imaging of distant clusters

open access: yes, 2004
Wide field imaging is key to understanding the build-up of distant clusters and their galaxy population. By focusing on the so far unexplored outskirts of clusters, where infalling galaxies first hit the cluster potential and the hot intracluster medium,
A. Diaferio, Tommaso Treu
core   +2 more sources

Clustering of Mass and Galaxies [PDF]

open access: yes, 2001
These lectures cover various aspects of the statistical description of cosmological density fields. Observationally, this consists of the point process defined by galaxies, and the challenge is to relate this to the continuous density field generated by gravitational instability in dark matter.
openaire   +3 more sources

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

open access: yesIET 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   +2 more
wiley   +1 more source

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