Results 81 to 90 of about 2,213,777 (304)

Comparing Dense Galaxy Cluster Redshift Surveys with Weak Lensing Maps [PDF]

, 2014
We use dense redshift surveys of nine galaxy clusters at $z\sim0.2$ to compare the galaxy distribution in each system with the projected matter distribution from weak lensing.
Diaferio, Antonaldo, Geller, Margaret J., Hwang, Ho Seong, Rines, Kenneth J., Zahid, H. Jabran   +4 more
core   +3 more sources

COSMIC: A Galaxy Cluster–Finding Algorithm Using Machine Learning

The Astrophysical Journal Supplement Series
Building a comprehensive catalog of galaxy clusters is a fundamental task for studies on structure formation and galaxy evolution. In this paper, we present Cluster Optical Search using Machine Intelligence in Catalogs (COSMIC), an algorithm utilizing ...
Da-Chuan Tian, Yang Yang, Zhong-Lue Wen, Jun-Qing Xia   +3 more
doaj   +1 more source

Dark matter filaments

Вісник Астрономічної школи, 2018
Present work is a review of extragalactic filament detection and galaxy orientation. Filaments are considered as a part of large-scale structure of Universe since the middle of XX century.
A. V. Tugay
doaj   +1 more source

The extended ROSAT-ESO flux limited X-ray galaxy cluster survey (REFLEX II) II. Construction and properties of the survey [PDF]

, 2013
Context. Galaxy clusters provide unique laboratories to study astrophysical processes on large scales and are important probes for cosmology. X-ray observations are currently the best means of detecting and characterizing galaxy clusters.
H. Bohringer, G. Chon, C. Collins, L. Guzzo, N. Nowak, S. Bobrovskyi   +5 more
semanticscholar   +1 more source

The Clustering of Galaxies

Publications of the Astronomical Society of the Pacific, 1961
Inspecti of photographs obtained with wide-angle telescopes sho' that the distribution of galaxies over the sky is distinctly nt miform. The observed dumpiness of the distribution of ga ies is believed to be due to a tendency for galaxies to occur in sters. A cluster of galaxies is usually regarded as a distinct >e of aggregate of matter.
openaire   +4 more sources

Galaxy harassment and the evolution of clusters of galaxies [PDF]

Nature, 1996
Disturbed spiral galaxies with high rates of star formation pervaded clusters of galaxies just a few billion years ago, but nearby clusters exclude spirals in favor of ellipticals. ``Galaxy harassment" (frequent high speed galaxy encounters) drives the morphological transformation of galaxies in clusters, provides fuel for quasars in subluminous hosts ...
Alan Dressler, Neal Katz, Ben Moore, Augustus Oemler, George Lake   +4 more
openaire   +2 more sources

Internal dynamics of the galaxy cluster Abell 545

, 2011
Diffuse radio emission in galaxy clusters, and their connection with cluster mergers, are still debated. We seek to explore the internal dynamics of the radio halo cluster Abell 545.
Abell, Anders, Ashman, Bacchi, Bardelli, Barrena, Barrena, Barrena, Beers, Beers, Beers, Beers, Beers, Bekki, Bell, Bertin, Binggelli, Bird, Biviano, Bonafede, Boschin, Boschin, Boschin, Boschin, Brunetti, Bullock, Buote, Buote, Böhringer, Carlberg, Cassano, Cassano, Cassano, Cassano, Cassano, Cavaliere, Chilingarian, Chilingarian, D. Eckert, Danese, David, den Hartog, Dolag, Dolag, Donnert, Dressler, Dubinsky, Ellingson, Ensslin, Ensslin, Ensslin, Fadda, Fasano, Ferrari, Ferrari, Ferrari, Finoguenov, Fukugita, Giovannini, Giovannini, Girardi, Girardi, Girardi, Girardi, Girardi, Girardi, Goto, Govoni, Hashimoto, Henriksen, Henry, Hoeft, Kalberla, Kennicutt, Kneib, Landolt, Leccardi, Leccardi, Limber, Lin, Liu, Loeb, M. Girardi, M. Rossetti, Malumuth, Markevitch, Markevitch, Mastropietro, Menci, Merritt, Million, Mushotzky, Navarro, Niederste-Ostholt, Nieto, Okabe, Owers, Pinkney, Pisani, Pisani, Quintana, R. Barrena, Ramella, Ramella, Ricker, Rines, Roettiger, Roettiger, Roettiger, Rossetti, Rudick, S. De Grandi, Salinas, Salinas, Sarazin, Sastry, Schlegel, Schneider, Springel, Struble, Struble, The, Tonry, Tribble, van Dokkum, W. Boschin, Wainer, West, White   +128 more
core   +1 more source

Discovery of a New Quadruple Lens HST 1411+5211 [PDF]

, 1998
Gravitational lensing is an important tool for probing the mass distribution of galaxies. In this letter we report the discovery of a new quadruple lens HST 1411+5211 found in archived WFPC2 images of the galaxy cluster CL140933+5226.
David Schade, Jorgensen I., L. Felipe Barrientos, Philippe Fischer, Refsdal S., Thimm G. J., Witt H. J.   +6 more
core   +2 more sources

Deep Synoptic Array Science: A Massive Elliptical Host Among Two Galaxy-cluster Fast Radio Bursts

The Astrophysical Journal, 2023
The stellar population environments that are associated with fast radio burst (FRB) sources provide important insights for developing their progenitor theories.
Kritti Sharma, Jean Somalwar, Casey Law, Vikram Ravi, Morgan Catha, Ge Chen, Liam Connor, Jakob T. Faber, Gregg Hallinan, Charlie Harnach, Greg Hellbourg, Rick Hobbs, David Hodge, Mark Hodges, James W. Lamb, Paul Rasmussen, Myles B. Sherman, Jun Shi, Dana Simard, Reynier Squillace, Sander Weinreb, David P. Woody, Nitika Yadlapalli, The Deep Synoptic Array team   +23 more
doaj   +1 more source

SHOCK HEATING OF THE MERGING GALAXY CLUSTER A521 [PDF]

, 2013
A521 is an interacting galaxy cluster located at z = 0.247, hosting a low-frequency radio halo connected to an eastern radio relic. Previous Chandra observations hinted at the presence of an X-ray brightness edge at the position of the relic, which may ...
H. Bourdin, P. Mazzotta, M. Markevitch, M. Markevitch, S. Giacintucci, G. Brunetti   +5 more
semanticscholar   +1 more source