scholarly journals The High-Redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey

2015 ◽  
Vol 11 (S319) ◽  
pp. 62-62
Author(s):  
Rachel Paterno-Mahler ◽  
Elizabeth L. Blanton ◽  
Joshua Wing ◽  
M.L.N. Ashby ◽  
Mark Brodwin ◽  
...  
Keyword(s):  
Radio Source ◽  
Galaxy Clusters ◽  
Large Range ◽  
High Redshift ◽  
Cosmic Time ◽  
Optical Data ◽  
Radio Sources ◽  
Cluster Galaxies ◽  
Redshift Galaxy ◽  
Red Sequence

AbstractThe number of confirmed, high-redshift galaxy clusters is very low compared to the number of well-studied clusters nearby. Bent, double-lobed radio sources are frequently found in galaxy clusters, and thus can be used as tracers for efficiently locating high-redshift clusters. Using our Spitzer Snapshot Survey, we have identified approximately 300 potential new clusters with redshifts 0.7 < z < 3. These objects make up the high-redshift portion of the Cluster Occupied by Bent Radio AGN (COBRA) survey. We have created color-magnitude diagrams using infrared and optical data. Using the colors of the radio source host and the red sequence we can estimate redshifts for our clusters, as well as examine the evolution of the cluster galaxies over a large range of cosmic time.

scholarly journals Alignment of Red-Sequence Cluster Dwarf Galaxies: From the Frontier Fields to the Local Universe

2015 ◽  
Vol 11 (S319) ◽  
pp. 5-5
Author(s):  
Wayne A. Barkhouse ◽  
Haylee Archer ◽  
Jaford Burgad ◽  
Gregory Foote ◽  
Cody Rude ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
Dwarf Galaxies ◽  
Local Universe ◽  
Alignment Effect ◽  
Cluster Galaxies ◽  
Sequence Cluster ◽  
Redshift Galaxy ◽  
Red Sequence

AbstractWe investigate the alignment effect of red-sequence dwarf galaxies using a sample of 121 low-redshift galaxy clusters and cluster galaxies selected from the HST Frontier Fields.

scholarly journals The accelerated build-up of the red sequence in high-redshift galaxy clusters

2016 ◽  
Vol 457 (2) ◽  
pp. 2209-2235 ◽  
Author(s):  
P. Cerulo ◽  
W. J. Couch ◽  
C. Lidman ◽  
R. Demarco ◽  
M. Huertas-Company ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
High Redshift ◽  
Redshift Galaxy ◽  
Red Sequence

The Red-Sequence Cluster Survey: The Value of Ωm and σ8

2005 ◽  
Vol 201 ◽  
pp. 459-460
Author(s):  
Michael D. Gladders ◽  
H. K. C. Yee
Keyword(s):  
Mass Spectrum ◽  
Qualitative Analysis ◽  
Survey Data ◽  
Galaxy Clusters ◽  
High Redshift ◽  
Sequence Cluster ◽  
Cluster Survey ◽  
Redshift Galaxy ◽  
Red Sequence

The Red-Sequence Cluster Survey (RCS) is a 100 deg2 optical survey for high-redshift galaxy clusters. One of the goals of the survey is a measurement of Ωm and σ8 via the evolution of the mass spectrum of galaxy clusters. Herein we briefly describe how this will initially be done, and also demonstrate the eventual power of the RCS for this type of measurement by a qualitative analysis of the first 1/10th of the survey data.

scholarly journals The growth of the red-sequence in clusters since ≃1

2009 ◽  
Vol 5 (H15) ◽  
pp. 88-88
Author(s):  
Roberto P. Muñoz ◽  
L. F. Barrientos ◽  
B. P. Koester ◽  
D. G. Gilbank ◽  
M. D. Gladders ◽  
...  
Keyword(s):  
Star Formation ◽  
Galaxy Clusters ◽  
Evolutionary Model ◽  
Large Ensemble ◽  
Cluster Galaxies ◽  
Nir Imaging ◽  
Measured Change ◽  
First Time ◽  
The Universe ◽  
Red Sequence

AbstractWe use deep nIR imaging of 15 galaxy clusters at z ≃ 1 to study the build-up of the red-sequence in rich clusters since the Universe was half its present age. We measured, for the first time, the luminous-to-faint ratio of red-sequence galaxies at z=1 from a large ensemble of clusters, and found an increase of 100% in the ratio of luminous-to-faint red-sequence galaxies from z=0.45 to 1.0. The measured change in this ratio as function of redshift is well-reproduced by a simple evolutionary model developed in this work, that consists in an early truncation of the star formation for bright cluster galaxies and a delayed truncation for faint cluster galaxies.

scholarly journals Extended Structure in High-Redshift Radio Sources

1982 ◽  
Vol 97 ◽  
pp. 59-60
Author(s):  
P. J. Duffett-Smith ◽  
A. Purvis
Keyword(s):  
Radio Source ◽  
High Redshift ◽  
Radio Sources ◽  
List Type ◽  
Type Number ◽  
Extended Structure ◽  
Structure Changes ◽  
Lower Luminosity ◽  
Source Structure

We have compared measurements of several hundred 3C and 4C radio sources at large redshifts to investigate how radio-source structure changes over a factor of 5–10 in luminosity. Our results show that for z ≳ 0.6: (i)most sources (both 3C and 4C) have hotspots about 3.5 kpc in size (Ho = 50 km s−1 Mpc−1, Ω = 1);(ii)lower-luminosity sources (bottom of 4C) have less-extended outer lobes.

The AGN dependence on cluster mass

2018 ◽  
Vol 14 (S342) ◽  
pp. 145-148
Author(s):  
Elias Koulouridis ◽  
Keyword(s):  
Galaxy Clusters ◽  
High Velocity ◽  
High Redshift ◽  
High Mass ◽  
X Ray ◽  
Cluster Galaxies ◽  
Cluster Mass ◽  
Bona Fide ◽  
Low Mass ◽  
Velocity Dispersions

AbstractWe present the results of a study of the AGN density in a homogeneous and well studied sample of 167 bona-fide X-ray galaxy clusters (0.1<z<0.5). Our aim is to study the AGN activity in 167 XXL X-ray galaxy clusters as a function of the cluster mass and the location of the AGN in the cluster. We report a significant AGN excess in our low-mass cluster sub-sample between 0.5r500 and 2r500. In contrast, the high-mass sub-sample presents no AGN excess. The AGN excess in poor clusters indicates AGN triggering, supporting previous studies that reported enhanced galaxy merging in the cluster outskirts. This effect is probably prevented by high velocity dispersions in high-mass clusters. Comparing also with previous studies of massive or high-redshift clusters, we conclude that the AGN fraction in cluster galaxies anti-correlates strongly with cluster mass.

scholarly journals Co-Evolution of Brightest Cluster Galaxies and Galaxy Activity in the Host Clusters

2009 ◽  
Vol 5 (S267) ◽  
pp. 110-110
Author(s):  
Mei-Ling Huang ◽  
Lin-wen Chen
Keyword(s):  
Galaxy Clusters ◽  
Radio Galaxy ◽  
Host Galaxy ◽  
Radio Sources ◽  
Wide Angle ◽  
Cluster Galaxies ◽  
Brightest Cluster Galaxies ◽  
Radio Power

AbstractWe have identified ~500 relatively relaxed galaxy clusters at low redshift (z < 0.3) from the maxBCG catalog with double radio lobes at the center; about 200 radio counterparts of brightest cluster galaxies (BCGs) of these clusters appear to be wide-angle tailed (WAT) radio sources, indicating ongoing interaction between its host galaxy and the surrounding ICM. Our analysis suggests that the radio power of WAT is positively correlated with the optical luminosities of host BCGs, and increases with redshift; whereas the cluster ellipticity-radio galaxy fraction relation shows no obvious difference between WAT and non-WAT clusters.

scholarly journals Scaling Relations from Sunyaev‐Zel’dovich Effect andChandraX‐Ray Measurements of High‐Redshift Galaxy Clusters

2008 ◽  
Vol 675 (1) ◽  
pp. 106-114 ◽  
Author(s):  
Massimiliano Bonamente ◽  
Marshall Joy ◽  
Samuel J. LaRoque ◽  
John E. Carlstrom ◽  
Daisuke Nagai ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
High Redshift ◽  
Scaling Relations ◽  
Redshift Galaxy ◽  
Sunyaev Zel'dovich Effect
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