Results 61 to 70 of about 90,494 (257)

Stellar populations in brightest cluster galaxies [PDF]

Proceedings of the International Astronomical Union, 2009
AbstractWe present the results of an investigation of a large sample of brightest cluster galaxies (BCGs), their kinematic and stellar population properties and the relationships between these and the properties of the host clusters. We have obtained high signal-to-noise, long-slit spectra of 49 BCGs in the nearby Universe with the Gemini and WHT ...
Loubser, S, Sanchez-Blazquez, P, Soechting, I, Sansom, A   +3 more
openaire   +1 more source

Internal dynamics of the galaxy cluster Abell 545

, 2011
Diffuse radio emission in galaxy clusters, and their connection with cluster mergers, are still debated. We seek to explore the internal dynamics of the radio halo cluster Abell 545.
Abell, Anders, Ashman, Bacchi, Bardelli, Barrena, Barrena, Barrena, Beers, Beers, Beers, Beers, Beers, Bekki, Bell, Bertin, Binggelli, Bird, Biviano, Bonafede, Boschin, Boschin, Boschin, Boschin, Brunetti, Bullock, Buote, Buote, Böhringer, Carlberg, Cassano, Cassano, Cassano, Cassano, Cassano, Cavaliere, Chilingarian, Chilingarian, D. Eckert, Danese, David, den Hartog, Dolag, Dolag, Donnert, Dressler, Dubinsky, Ellingson, Ensslin, Ensslin, Ensslin, Fadda, Fasano, Ferrari, Ferrari, Ferrari, Finoguenov, Fukugita, Giovannini, Giovannini, Girardi, Girardi, Girardi, Girardi, Girardi, Girardi, Goto, Govoni, Hashimoto, Henriksen, Henry, Hoeft, Kalberla, Kennicutt, Kneib, Landolt, Leccardi, Leccardi, Limber, Lin, Liu, Loeb, M. Girardi, M. Rossetti, Malumuth, Markevitch, Markevitch, Mastropietro, Menci, Merritt, Million, Mushotzky, Navarro, Niederste-Ostholt, Nieto, Okabe, Owers, Pinkney, Pisani, Pisani, Quintana, R. Barrena, Ramella, Ramella, Ricker, Rines, Roettiger, Roettiger, Roettiger, Rossetti, Rudick, S. De Grandi, Salinas, Salinas, Sarazin, Sastry, Schlegel, Schneider, Springel, Struble, Struble, The, Tonry, Tribble, van Dokkum, W. Boschin, Wainer, West, White   +128 more
core   +1 more source

Riding the wake of a merging galaxy cluster [PDF]

, 2011
Using WHT OASIS integral field unit observations, we report the discovery of a thin plume of ionised gas extending from the brightest cluster galaxy in Abell 2146 to the sub-cluster X-ray cool core which is offset from the BCG by ~37 kpc.
A. C. Fabian, A. I. Zabludoff, Abramson, Ascasibar, B. R. McNamara, Baldwin, Binney, C. S. Crawford, Colbert, Crawford, Dursi, Edge, Edwards, Evrard, H. R. Russell, Hallman, Hatch, Heckman, Hudson, Kewley, Kormendy, Krivonos, L. J. King, Lyutikov, Macario, Markevitch, Markevitch, Markevitch, Markwardt, Mathis, McNamara, Moré, N. A. Hatch, Oguri, Osterbrock, O’Dea, Peterson, Poole, R. E. A. Canning, Rupke, Russell, Russell, S. I. Raimundo, S. Okamoto, Sanders, Sanderson, Sarazin, Schlegel, Springel, Sun, Veilleux, Wilman, Wilman, Yagi, Zabludoff   +54 more
core   +1 more source

How special are brightest group and cluster galaxies? [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
Abstract We use the Sloan Digital Sky Survey (SDSS) to construct a sample of 625 brightest group and cluster galaxies (BCGs) together with control samples of non-BCGs matched in stellar mass, redshift and colour. We investigate how the systematic properties of BCGs depend on stellar mass and on their privileged location near the cluster ...
von der Linden, Anja, Best, Philip N., Kauffmann, Guinevere, White, Simon D. M.   +3 more
openaire   +4 more sources

The XMM Cluster Survey: the interplay between the brightest cluster galaxy and the intracluster medium via AGN feedback [PDF]

, 2012
Using a sample of 123 X-ray clusters and groups drawn from the XMM Cluster Survey first data release, we investigate the interplay between the brightest cluster galaxy (BCG), its black hole and the intracluster/group medium (ICM).
J. Stott, R. Hickox, A. Edge, C. Collins, M. Hilton, C. Harrison, A. Romer, P. Rooney, S. Kay, C. Miller, M. Sahlén, E. Lloyd-Davies, N. Mehrtens, B. Hoyle, A. Liddle, P. T. P. Viana, I. McCarthy, J. Schaye, C. Booth   +18 more
semanticscholar   +1 more source

THE EVOLUTION OF BRIGHTEST CLUSTER GALAXIES IN A HIERARCHICAL UNIVERSE [PDF]

The Astrophysical Journal, 2012
We investigate the evolution of Brightest Cluster Galaxies (BCGs) from redshift z~1.6 to z~0. We use the semi-analytic model of Croton et al. (2006) with a new spectro-photometric model based on the Maraston (2005) stellar populations and a new recipe for the dust extinction. We compare the model predictions of the K-band luminosity evolution and the J-
Tonini, Chiara, Bernyk, Maksym, Croton, Darren, Maraston, Claudia, Thomas, Daniel   +4 more
openaire   +5 more sources

Chandra Observations of A2670 and A2107: A Comet Galaxy and cDs with Large Peculiar Velocities

, 2005
We present an analysis of Chandra observations of the galaxy clusters A2670 and A2107. Their cD galaxies have large peculiar velocities (>200km/s) and thus the clusters appear to be undergoing mergers.
Fujita, Yutaka, Sarazin, Craig L., Sivakoff, Gregory R.   +2 more
core   +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, Bahcall, Bahcall, Bartelmann, Brainerd, Carlberg, Carlberg, Carlberg, Dalcanton, Fukugita, Gonzalez, Hoessel, M. Bartelmann, Metcalfe, Navarro, Navarro, Postman, Postman, S. D. M. White, Schneider, van Dokkum, van Dokkum, Woods, Zaritsky, Zaritsky   +24 more
core   +2 more sources

Miscentring in Galaxy Clusters: Dark Matter to Brightest Cluster Galaxy Offsets in 10,000 SDSS Clusters [PDF]

, 2012
We characterise the typical offset between the Dark Matter (DM) projected centre and the Brightest Cluster Galaxy (BCG) in 10,000 SDSS clusters. To place constraints on the centre of DM, we use an automated strong-lensing analysis, mass-modelling ...
A. Zitrin, M. Bartelmann, K. Umetsu, M. Oguri, T. Broadhurst   +4 more
semanticscholar   +1 more source

A BRIGHTEST CLUSTER GALAXY WITH AN EXTREMELY LARGE FLAT CORE [PDF]

, 2012
Hubble Space Telescope images of the galaxy cluster A2261, obtained as part of the Cluster Lensing And Supernova survey with Hubble, show that the brightest galaxy in the cluster, A2261-BCG, has the largest core yet detected in any galaxy.
M. Postman, T. Lauer, M. Donahue, G. Graves, D. Coe, J. Moustakas, A. Koekemoer, L. Bradley, H. Ford, C. Grillo, A. Zitrin, D. Lemze, T. Broadhurst, L. Moustakas, B. Ascaso, E. Medezinski, D. Kelson   +16 more
semanticscholar   +1 more source