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We use a sample of galaxies from the Two Micron All Sky Survey (2MASS) Extended Source Catalog to refine a matched filter method of finding galaxy clusters that takes into account each galaxy's position, magnitude, and redshift if…

宇宙学与河外天体物理 · 物理学 2012-03-08 Jeffrey A. Blackburne , Christopher S. Kochanek

We present a comparison of two samples of z>0.8 galaxy clusters selected using different wavelength-dependent techniques and examine the physical differences between them. We consider 18 clusters from the X-ray selected XMM-LSS distant…

宇宙学与河外天体物理 · 物理学 2018-04-19 J. P. Willis , M. E. Ramos-Ceja , A. Muzzin , F. Pacaud , H. K. C. Yee , G. Wilson

We present the largest sample of spectroscopically confirmed X-ray luminous high-redshift galaxy clusters to date comprising 22 systems in the range 0.9<z<\sim1.6 as part of the XMM-Newton Distant Cluster Project (XDCP). All systems were…

We present an analysis of the colour-magnitude relation for a sample of 56 X-ray underluminous Abell clusters, aiming to unveil properties that may elucidate the evolutionary stages of the galaxy populations that compose such systems. To do…

We study a sample of 19 galaxy clusters in the redshift range $0.15<z<0.30$ with highly complete spectroscopic membership catalogues (to $K < K^{\ast}(\rm z)+1.5$) from the Arizona Cluster Redshift Survey (ACReS); individual weak-lensing…

宇宙学与河外天体物理 · 物理学 2017-10-11 Sarah L. Mulroy , Sean L. McGee , Steven Gillman , Graham P. Smith , Chris P. Haines , Jessica Democles , Nobuhiro Okabe , Eiichi Egami

Cluster scaling relations are key ingredients in cluster abundance-based cosmological studies. In optical cluster cosmology, where clusters are detected through their richness, cluster-weak gravitational lensing has proven to be a powerful…

We study the ratio of luminous-to-faint red sequence galaxies in both optically and X-ray selected galaxy clusters in the poorly studied redshift range 0.05< z<0.19. The X-ray selected sample consists of 112 clusters based on the ROSAT…

宇宙学与河外天体物理 · 物理学 2015-05-14 Diego Capozzi , Chris A. Collins , John P. Stott

Up to now, the largest sample of galaxy clusters selected in X-rays comes from the ROSAT All-Sky Survey (RASS). Although there have been many interesting clusters discovered with the RASS data, the broad point spread function (PSF) of the…

星系天体物理 · 物理学 2019-06-12 M. E. Ramos-Ceja , F. Pacaud , T. H. Reiprich , K. Migkas , L. Lovisari , G. Schellenberger

[Abridged] We study the X-ray properties of a color-selected sample of clusters at 0.1<z<0.3, to quantify the real aboundance of the population of X-ray dark or underluminous clusters and at the same time the spurious detection…

宇宙学与河外天体物理 · 物理学 2015-05-30 S. Andreon , A. Moretti

There have been several reports of a detection of an unexplained excess of X-ray emission at $\simeq$ 3.5 keV in astrophysical systems. One interpretation of this excess is the decay of sterile neutrino dark matter. The most influential…

In this paper, we present the tools used to search for galaxy clusters in the Kilo Degree Survey (KiDS), and our first results. The cluster detection is based on an implementation of the optimal filtering technique that enables us to…

The use of galaxy clusters as cosmological probes relies on a detailed understanding of their properties. We aim to update the spectroscopic cluster identification of CODEX by running the spectroscopic group finder on the follow-up…

宇宙学与河外天体物理 · 物理学 2023-07-19 S. Damsted , A. Finoguenov , N. Clerc , I. Davalgaite , C. C. Kirkpatrick , G. A. Mamon , J. Ider Chitham , K. Kiiveri , J. Comparat , C. Collins

We present the MARD-Y3 catalog of between 1086 and 2171 galaxy clusters (52\% and 65\% new) produced using multi-component matched filter (MCMF) followup in 5000\,deg$^2$ of DES-Y3 optical data of the $\sim$20000 overlapping 2RXS X-ray…

宇宙学与河外天体物理 · 物理学 2019-06-05 Matthias Klein , Sebastian Grandis , Joseph Mohr , Maria Paulus , the DES Collaboration

Rich and massive clusters of galaxies at intermediate redshift are capable of magnifying and distorting the images of background galaxies. A comparison of different mass estimators among these clusters can provide useful information about…

天体物理学 · 物理学 2009-10-30 Xiang-Ping Wu , Tzihong Chiueh , Li-Zhi Fang , Yan-Jie Xue

We present an analysis of the X-ray point source populations in 182 Chandra images of galaxy clusters at z>0.1 with exposure time >10 ksec, as well as 44 non-cluster fields. Analysis of the number and flux of these sources, using a detailed…

星系天体物理 · 物理学 2010-04-29 R. Gilmour , P. Best , O. Almaini

Here we discuss the X-ray properties of clusters of galaxies optically selected in the Red-Sequence Cluster Survey (RCS) observed with the Chandra satellite, at redshifts 0.6 < z < 1.2. We intended to assess the evolutionary stage of…

天体物理学 · 物理学 2009-11-13 A. Bignamini , P. Tozzi , S. Borgani , S. Ettori , P. Rosati

XMM and Chandra opened a new area for the study of clusters of galaxies. Not only for cluster physics but also, for the detection of faint and distant clusters that were inaccessible with previous missions. This article presents 66…

We analyse the spatial clustering properties of a new catalogue of very rich galaxy clusters selected from the APM Galaxy Survey. These clusters are of comparable richness and space density to Abell Richness Class $\geq 1$ clusters, but…

天体物理学 · 物理学 2015-06-24 Rupert A. C. Croft , Gavin B. Dalton , George Efstathiou , Will Sutherland , Steve Maddox

This work attains a threefold objective: first, we derived the richness-mass scaling in the local Universe from data of 53 clusters with individual measurements of mass. We found a 0.46+-0.12 slope and a 0.25+-0.03 dex scatter measuring…

宇宙学与河外天体物理 · 物理学 2015-06-11 S. Andreon , J. Bergé