At low redshift, cluster galaxy populations are very well established (e.g., Eisenhardt et al. Clusters are partially characterized observationally by their galaxy populations and hot, X-ray-emitting gas in the form of the intracluster medium (ICM). Galaxy clusters are the largest gravitationally bound structures in the universe. Although these sources typically do not follow directly radial paths, the large population of outgoing sources contrasts what is observed in low- z samples of bent sources and may indicate that the intracluster medium is less dense in these high- z clusters. By measuring the orientation of the radio sources relative to the cluster centers, we find between 30% and 42% of COBRA bent sources are outgoing and have passed through the cluster center, while between 8% and 58% of COBRA bent sources are infalling. The projected separations between the radio sources and cluster centers and the sizes of the opening angles of bent sources follow similar distributions for BCG and non-BCG host populations, suggesting that COBRA host galaxies are either BCGs or galaxies that may evolve into BCGs. Within these clusters, we determine 55.5% of our radio host galaxies are brightest cluster galaxies (BCGs) and that the remainder are associated with other luminous galaxies. By combining radio observations from the Very Large Array Faint Images of the Radio Sky at Twenty centimeters (VLA FIRST) survey with optical and infrared imaging of 36 red sequence selected cluster candidates from the high- z Clusters Occupied by Bent Radio AGN (COBRA) survey (0.35 < z < 2.2), we find that radio sources with narrower opening angles reside in richer clusters, indicating that the cluster environment impacts radio morphology. Bent sources can therefore be used to identify galaxy clusters and characterize their evolutionary history.
The shape of bent, double-lobed radio sources requires a dense gaseous medium. University of Hawai'i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026, People's Republic of Chinaĭepartment of Physics, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA Mills Avenue, Claremont, CA 91711, USAĭepartment of Physics & Astronomy, University of Missouri-Kansas City, 5110 Rockhill Road, Kansas City, MO 64110, USAĬenter for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAĪstronomical Institute of the Czech Academy of Sciences, Boční II 1401/IA, 14000 Praha 4, Czech RepublicĬAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, People's Republic of China does not assume any responsibility for errors or omissions or warrant the accuracy of this information.Department of Astronomy, Tsinghua University, Beijing 100084, People's Republic of China of Astronomy and The Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA Visit our partner sites for job openings for Singapore jobs, real estate, mover, car performance parts, car discussion, forum discussion, commercial vehicle leasing & COE results.Īll prices and other information displayed on are gathered from sources and based on algorithms that are believed by to be reliable, but no assurance can be given that this information is accurate, complete or current. Find new car price lists, new car launches and new car promotions. We have new car dealers comprising parallel importers, authorised car dealers, and used car dealers on our site. Find buy used Mark, Mark Singapore, used Mark Singapore, used Mark, used vehicles Singapore or even buy used Mark Singapore. You can also buy from a car auction, look up car loans, low mileage cars, car brands, carpark rates & car insurance. There are plenty of cars for sale, from vans, trucks, sports cars or stationwagons, SUV, MPV, hatchback, to COE cars & OPC cars. Sgcarmart is the number one car classifieds for parallel import cars, Toyota, Honda, Nissan, Mitsubishi & BMW.