Results 11 to 20 of about 12,566,242 (368)
Scaling Properties of Galaxy Groups [PDF]
Universe, 2021 Galaxy groups and poor clusters are more common than rich clusters, and host the largest fraction of matter content in the Universe. Hence, their studies are key to understand the gravitational and thermal evolution of the bulk of the cosmic matter.
Lorenzo Lovisari +3 more
doaj +8 more sources
Feedback from Active Galactic Nuclei in Galaxy Groups [PDF]
Universe, 2021 The co-evolution between supermassive black holes and their environment is most directly traced by the hot atmospheres of dark matter halos. The cooling of the hot atmosphere supplies the central regions with fresh gas, igniting active galactic nuclei ...
Dominique Eckert +4 more
doaj +2 more sources
Baryonically Closed Galaxy Groups [PDF]
The Astrophysical Journal, 2005 Elliptical galaxies and their groups having the largest L_x/L_B lie close to the locus in the L_x,L_B diagram expected for closed systems with baryon fractions equal to the cosmic mean value, f_b = 0.16.
Andreas Faltenbacher +7 more
core +6 more sources
Properties of Fossil Groups of Galaxies [PDF]
Universe, 2021 We review the formation and evolution of fossil groups and clusters from both the theoretical and the observational points of view. In the optical band, these systems are dominated by the light of the central galaxy. They were interpreted as old systems that had enough time to merge all the M* galaxies within the central one.
S. Zarattini, J. Alfonso L. Aguerri
openaire +6 more sources
Satellite Luminosities in Galaxy Groups [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 Halo model interpretations of the luminosity dependence of galaxy clustering assume that there is a central galaxy in every sufficiently massive halo, and that this central galaxy is very different from all the others in the halo.
Martino, Matthew C. +2 more
core +6 more sources
Physical Review D, 2018 Galaxy groups, which have hardly been looked at in MOND, afford probing the acceleration discrepancies in regions of system-parameter space that are not accessible in well-studied galactic systems, such as galaxies, galaxy clusters, and dwarf-spheroidal satellites of galaxies.
M. Milgrom
openaire +5 more sources
Galaxy groups and the modified dynamics [PDF]
The Astrophysical Journal, 1998 I estimate Modified-Dynamics (MOND), median M/L values for recently published catalogues of galaxy groups. While the median, Newtonian M/L values quoted for these catalogues are 110-200 solar units, the corresponding values for MOND are less than 10 ...
Begeman K. G. +3 more
core +4 more sources
Galaxy-galaxy weak-lensing measurement from SDSS: II. host halo properties of galaxy groups [PDF]
Astrophysical Journal, 2017 As the second paper of a series on studying galaxy-galaxy lensing signals using the Sloan Digital Sky Survey Data Release 7 (SDSS DR7), we present our measurement and modelling of the lensing signals around groups of galaxies.
Fu, Liping +12 more
core +4 more sources
The Astronomical Journal, 2015 Galaxy groups can be characterized by the radius of decoupling from cosmic expansion, the radius of the caustic of second turnaround, and the velocity dispersion of galaxies within this latter radius. These parameters can be a challenge to measure, especially for small groups with few members.
R. Brent Tully
openaire +4 more sources
Evolution of galaxy groups in the Illustris simulation [PDF]
, 2016 We present the first study of evolution of galaxy groups in the Illustris simulation. We focus on dynamically relaxed and unrelaxed galaxy groups representing dynamically evolved and evolving galaxy systems, respectively.
Dariush, Ali A. +2 more
core +3 more sources