Results 71 to 80 of about 90,494 (257)

Blowing cold flows away: the impact of early AGN activity on the formation of a brightest cluster galaxy progenitor [PDF]

, 2012
Supermassive black holes (BH) are powerful sources of energy that are already in place at very early epochs of the Universe (by z=6). Using hydrodynamical simulations of the formation of a massive M_vir=5 10^11 M_sun halo by z=6 (the most massive ...
Y. Dubois, C. Pichon, J. Devriendt, J. Silk, M. Haehnelt, T. Kimm, A. Slyz   +6 more
semanticscholar   +1 more source

Dynamics and Shape of Brightest Cluster Galaxies [PDF]

, 2007
2 pages, 2 figures, Proc. ESO Workshop "Groups of galaxies in the nearby Universe", Santiago, Chile, 5-9 Dec. 2005, ESO Astrophysics Symposia, eds. I. Saviane, V. Ivanov & J.
Karla Alamo-Martínez, Erik Tago, Roger Coziol, Heinz Andernach   +3 more
openaire   +4 more sources

THE DYNAMICAL STATE OF BRIGHTEST CLUSTER GALAXIES AND THE FORMATION OF CLUSTERS [PDF]

The Astronomical Journal, 2009
114 pages, 9 figures, full version of tables 1 and 2; accepted to appear in ...
Roger Coziol, Erik Tago, Karla Alamo-Martínez, Heinz Andernach, César A. Caretta   +4 more
openaire   +3 more sources

Mining the gap: evolution of the magnitude gap in X-ray galaxy groups from the 3 square degree XMM coverage of CFHTLS

, 2014
We present a catalog of 129 X-ray galaxy groups, covering a redshift range 0 ...
Brimioulle, F., Egami, E., Erben, T., Erfanianfar, G., Finoguenov, A., Gozaliasl, G., Jassur, D. M. Z., Khosroshahi, H. G., Kneib, J. P., Lerchster, M., McCracken, H. J., Mellier, Y., Mirkazemi, M., Pereira, M. J., Popesso, P., Salvato, M., Seitz, S., Tanaka, M.   +17 more
core   +3 more sources

GLOBULAR CLUSTERS AND SPUR CLUSTERS IN NGC 4921, THE BRIGHTEST SPIRAL GALAXY IN THE COMA CLUSTER [PDF]

, 2016
We resolve a significant fraction of globular clusters (GCs) in NGC 4921, the brightest spiral galaxy in the Coma cluster. We also find a number of extended bright star clusters (star complexes) in the spur region of the arms.
M. Lee, I. Jang
semanticscholar   +1 more source

An Infrared Survey of Brightest Cluster Galaxies. II. Why are Some Brightest Cluster Galaxies Forming Stars? [PDF]

The Astrophysical Journal, 2008
Quillen et al.(2007) presented an imaging survey with the {\it Spitzer Space Telescope} of 62 brightest cluster galaxies with optical line emission located in the cores of X-ray luminous clusters. They found that at least half of these sources have signs of excess infrared emission. Here we discuss the nature of the IR emission and its implications for
O'Dea, C.P., Baum, S.A., Privon, G., Noel-Storr, J., Quillen, A.C., Zufelt, N., Park, J., Edge, A., Russell, H., Fabian, A.C., Donahue, M., Sarazin, C.L., McNamara, B., Bregman, J.N., Egami, E.   +14 more
openaire   +5 more sources

Multitarget Recognition of Flower Images Based on Lightweight Deep Neural Network and Transfer Learning

Advanced Intelligent Systems, EarlyView.
This article proposes a lightweight YOLOv4‐based detection model using MobileNetV3 or CSPDarknet53_tiny, achieving 30+ FPS and higher mAP. It also presents a ShuffleNet‐based classification model with transfer learning and GAN‐augmented images, improving generalization and accuracy.
Qingyang Liu, Yanrong Hu, Hongjiu Liu
wiley   +1 more source

Do arcs require flat halo cusps?

, 2003
It was recently claimed that several galaxy clusters containing radial and tangential gravitational arcs and having a measured velocity-dispersion profile for the brightest cluster galaxy had to have central density profiles considerably flatter than ...
Bartelmann, Jaffe, Jing, Klypin, M. Bartelmann, M. Meneghetti, Miralda-Escudé, Moore, Navarro, Sand, Wyithe   +10 more
core   +1 more source

Galaxy Orientations in the Coma Cluster [PDF]

, 2007
We have examined the orientations of early-type galaxies in the Coma cluster to see whether the well-established tendency for brightest cluster galaxies to share the same major axis orientation as their host cluster also extends to the rest of the galaxy
Binggeli B., Ciotti L., Coutts A., Lisa Torlina, Michael J. West, Roberto De Propris, West M. J.   +6 more
core   +2 more sources

A deep spectroscopic study of the filamentary nebulosity in NGC 4696, the brightest cluster galaxy in the Centaurus cluster [PDF]

, 2011
We present results of deep integral-field spectroscopy observations using high-resolution optical (4150–7200 A) VLT VIsible MultiObject Spectrograph spectra of NGC 4696, the dominant galaxy in the Centaurus cluster (Abell 3526).
R. Canning, A. Fabian, R. Johnstone, J. Sanders, C. Crawford, G. Ferland, N. A. Hatch   +6 more
semanticscholar   +1 more source