Results 31 to 40 of about 2,267,963 (287)
DETECTION OF AN UNIDENTIFIED EMISSION LINE IN THE STACKED X-RAY SPECTRUM OF GALAXY CLUSTERS [PDF]
, 2014 We detect a weak unidentified emission line at E = (3.55–3.57) ± 0.03 keV in a stacked XMM-Newton spectrum of 73 galaxy clusters spanning a redshift range 0.01–0.35. When the full sample is divided into three subsamples (Perseus, Centaurus+Ophiuchus+Coma,
E. Bulbul +5 more
semanticscholar +1 more source
THE CRITERIA FOR MORPHOLOGICAL CLASSIFICATION OF PF GALAXY CLUSTERS
Odessa Astronomical Publications, 2013 The morphological types of galaxy clusters resulting from their out ward appearance is physically related to the clusters and their member galaxies. Presented here is an adopted system of morphological types of galaxy clusters based on the Zwicky, Boutz ...
E. A. Panko
doaj +1 more source
The Astrophysical Journal, 2023 A fraction of merging galaxy clusters host diffuse radio emission in their central region, termed a giant radio halo (GRH). The most promising mechanism of GRHs is the reacceleration of nonthermal electrons and positrons by merger-induced turbulence ...
Kosuke Nishiwaki +2 more
doaj +1 more source
The Environmental Dependence of the Evolving S0 Fraction [PDF]
, 2010 We reinvestigate the dramatic rise in the S0 fraction, f_S0, within clusters since z ~ 0.5. In particular, we focus on the role of the global galaxy environment on f_S0 by compiling, either from our own observations or the literature, robust line-of ...
Andreon +38 more
core +2 more sources
The nongravitational interactions of dark matter in colliding galaxy clusters [PDF]
Science, 2015 Uncloaking the influence of the invisible actor The idea of dark matter enjoys popular support, but two major concerns persist: the so-called Standard Model excludes it, and it cannot be directly detected by any telescope.
D. Harvey +4 more
semanticscholar +1 more source
THE ELLIPTICITIES OF GALAXIES IN GALAXY CLUSTERS OF DIFFERENT MORPHOLOGICAL TYPE
Odessa Astronomical Publications, 2014 The distribution of galaxy ellipticities was analyzed for 207 rich PF galaxy clusters found in the Munster Red Sky Survey Galaxy Catalogue. Clusters with BM types from a comparison with the ACO catalogue were also classified on the new scheme.
E. A. Panko, P. Flin
doaj +1 more source
3D-Matched-Filter Galaxy Cluster Finder I: Selection Functions and CFHTLS Deep Clusters [PDF]
, 2009 We present an optimised galaxy cluster finder, 3D-Matched-Filter (3D-MF), which utilises galaxy cluster radial profiles, luminosity functions and redshift information to detect galaxy clusters in optical surveys.
Adami +53 more
core +4 more sources
Dark matter phenomenology of high-speed galaxy cluster collisions
European Physical Journal C: Particles and Fields, 2017 We perform a general computational analysis of possible post-collision mass distributions in high-speed galaxy cluster collisions in the presence of self-interacting dark matter.
Yuriy Mishchenko, Chueng-Ryong Ji
doaj +1 more source
Cluster detection from surface-brightness fluctuations in SDSS data [PDF]
, 2001 Galaxy clusters can be detected as surface brightness enhancements in smoothed optical surveys. This method does not require individual galaxies to be identifiable, and enables clusters to be detected out to surprisingly high redshifts, as recently ...
Aragón-Salamanca +24 more
core +2 more sources
The abundance and spatial distribution of ultra-diffuse galaxies in nearby galaxy clusters [PDF]
, 2016 Recent observations have highlighted a significant population of faint but large (r_eff>1.5 kpc) galaxies in the Coma cluster. The origin of these Ultra Diffuse Galaxies (UDGs) remains puzzling, as the interpretation of the observational results has been
R. Burg, A. Muzzin, H. Hoekstra
semanticscholar +1 more source