Results 81 to 90 of about 2,694,449 (145)

Filaments of galaxies and Voronoi diagrams

Open Astronomy, 2018
The intersections between a spherical shell and the faces of Voronoi polyhedrons are numerically evaluated. The nodes of these intersections are the points that share the same distances from three nuclei.
Zaninetti Lorenzo
doaj   +1 more source

Simulating Groups and the IntraGroup Medium: The Surprisingly Complex and Rich Middle Ground between Clusters and Galaxies

Universe, 2021
Galaxy groups are more than an intermediate scale between clusters and halos hosting individual galaxies, they are crucial laboratories capable of testing a range of astrophysics from how galaxies form and evolve to large scale structure (LSS) statistics
Benjamin D. Oppenheimer, Arif Babul, Yannick Bahé, Iryna S. Butsky, Ian G. McCarthy   +4 more
doaj   +1 more source

The evolution of the star formation activity per halo mass up to redshift ~1.6 as seen by Herschel [PDF]

, 2012
Aims. Star formation in massive galaxies is quenched at some point during hierarchical mass assembly. To understand where and when the quenching processes takes place, we study the evolution of the total star formation rate per unit total halo mass (Σ ...
Capak, P., Fadda, D., Popesso, P.
core  

Hot Gas in Galaxy Groups: Recent Observations

, 2012
Galaxy groups are the least massive systems where the bulk of baryons begin to be accounted for. Not simply the scaled-down versions of rich clusters following self-similar relations, galaxy groups are ideal systems to study baryon physics, which is ...
Baumgartner W H, Bower R G, Buote D A, Buote D A, Burenin R A, Bîrzan L, Cavagnolo K W, Cavagnolo K W, Cavagnolo K W, Dai X, Diehl S, Dunkley J, Dunn R J H, Eckert D, Finoguenov A, Finoguenov A, Freeland E, Fukazawa T, Gastaldello F, Giodini S, Gitti M, Gonzalez A H, Helsdon S F, Humphrey P J, Humphrey P J, Humphrey P J, Koester B P, Komatsu E, Komiyama M, Leauthaud A, Leauthaud A, Lin Y T, Lin Y T, Lueker M, M Sun, Mahdavi A, Maughan B J, McCarthy I G, McDonald M, McNamara B R, Motl P M, Mulchaey J S, Murakami H, Nagai D, O'Hara T B, O'Sullivan E, Puchwein E, Rafferty D A, Randall S W, Rasia E, Rasmussen J, Reichardt C L, Renzini A, Rozo E, Rozo E, Rykoff E S, Sato K, Sehgal N, Shaw L D, Shirokoff E, Sun M, Sun M, Sun M, Sun M, Sun M, Tonry J L, Trac H, Vikhlinin A, Vikhlinin A, Vikhlinin A, von der Linden A, Wetzel A R Tinker J L Conroy C   +71 more
core   +1 more source

Missing Baryons, from Clusters to Groups of Galaxies [PDF]

The Astrophysical Journal, 2007
From clusters to groups of galaxies, the powerful bremsstrahlung radiation L_X emitted in X rays by the intracluster plasma is observed to decline sharply with lowering virial temperatures T (i.e., at shallower depths of the gravitational wells) after a steep local L_X-T correlation; this implies increasing scarcity of diffuse baryons relative to dark ...
Cavaliere, A., Lapi, A.
openaire   +4 more sources

Some Properties of Galaxy Structures

Open Astronomy, 2011
We analysed some properties of galaxies structures based on the PF catalog of galaxy structures (Panko & Flin 2006) and the Tully NBG catalog (Tully 1988).
Flin Piotr, Biernacka Monika, Godłowski Włodzimierz, Panko Elena, Piwowarska Paulina   +4 more
doaj   +1 more source

The FRB 20190520B Sight Line Intersects Foreground Galaxy Clusters

The Astrophysical Journal Letters, 2023
The repeating fast radio burst FRB 20190520B is an anomaly of the FRB population thanks to its high dispersion measure (DM = 1205 pc cm ^−3 ) despite its low redshift of z _frb = 0.241.
Khee-Gan Lee, Ilya S. Khrykin, Sunil Simha, Metin Ata, Yuxin Huang, J. Xavier Prochaska, Nicolas Tejos, Jeff Cooke, Kentaro Nagamine, Jielai Zhang   +9 more
doaj   +1 more source

Mind the Gap: Tightening the Mass-Richness Relation with Magnitude Gaps [PDF]

, 2013
We investigate the potential to improve optical tracers of cluster mass by exploiting measurements of the magnitude gap, m12, defined as the difference between the r-band absolute magnitude of the two brightest cluster members.
Abazajian, Allen, Andreas A. Berlind, Andrew P. Hearin, Andrew R. Zentner, Becker, Behroozi, Berlind, Blanton, Conroy, D'Onghia, Gladders, Hearin, Jeffrey A. Newman, Jones, Klypin, Koester, Kravtsov, Newman, Paranjape, Proctor, Reyes, Riebe, Rozo, Rozo, Rykoff, Skibba, Tinker, Trujillo-Gomez, Watson, Weinberg, Wu, Yang, Zentner   +33 more
core   +1 more source

How special are brightest group and cluster galaxies? [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
Abstract We use the Sloan Digital Sky Survey (SDSS) to construct a sample of 625 brightest group and cluster galaxies (BCGs) together with control samples of non-BCGs matched in stellar mass, redshift and colour. We investigate how the systematic properties of BCGs depend on stellar mass and on their privileged location near the cluster ...
von der Linden, Anja, Best, Philip N., Kauffmann, Guinevere, White, Simon D. M.   +3 more
openaire   +4 more sources

Extended Radio Emission in the Perhipheral Regions of the Shapley Concentration Core

Galaxies, 2017
The Shapley Concentration (SC) is a galaxy supercluster (few tens of degrees) in the Local Universe (<z>∼0.048) which is currently undergoing cluster mergers and group accretion.
Tiziana Venturi, Sandro Bardelli, Daniele Dallacasa, Gabriella Di Gennaro, Fabio Gastaldello, Simona Giacintucci, Mariachiara Rossetti   +6 more
doaj   +1 more source