Results 81 to 90 of about 91,719 (307)

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

Parsec-scale properties of brightest cluster galaxies [PDF]

Astronomy and Astrophysics, 2010
20 pages, 10 figures, accepted for publication in A& ...
LIUZZO, ELISABETTA, GIOVANNINI, GABRIELE, Giroletti M., Taylor G.   +3 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

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 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

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, EarlyView.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

COSMIC: A Galaxy Cluster–Finding Algorithm Using Machine Learning

The Astrophysical Journal Supplement Series
Building a comprehensive catalog of galaxy clusters is a fundamental task for studies on structure formation and galaxy evolution. In this paper, we present Cluster Optical Search using Machine Intelligence in Catalogs (COSMIC), an algorithm utilizing ...
Da-Chuan Tian, Yang Yang, Zhong-Lue Wen, Jun-Qing Xia   +3 more
doaj   +1 more source

Understanding shape and centroid deviations in 39 strong lensing galaxy clusters in various dynamical states [PDF]

EPJ Web of Conferences
Through observational tests of strong lensing galaxy clusters, we can test simulation derived structure predictions that follow from Λ Cold Dark Matter (ΛCDM) cosmology.
Gassis Raven, Bayliss Matthew B., Sharon Keren, Mahler Guillaume, Gladders Michael D., Dahle Håkon, Florian Michael K., Rigby Jane R., McDonald Michael, Elicker Lauren, Owens M. Riley   +10 more
doaj   +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

Order statistics of the early-type galaxy luminosity function [PDF]

, 2011
We apply order statistics (OS) to the bright end ($M_r < -22$) of the luminosity distribution of early-type galaxies spectroscopically identified in the SDSS DR7 catalog.
Abazajian, Aragón-Salamanca, Bell, Bell, Bernstein, Bhavsar, Blanton, Blanton, Bolzonella, Budavári, Burke, Cannon, Csabai, Davis, De Lucia, Eisenstein, Ellis, Faber, Fisher, Fukugita, Gallazzi, Geller, Geller, Gnedenko, Gumbel, Gunn, Györgyi, Hildebrandt, István Csabai, Kaviraj, Le Fèvre, Lin, Liu, Loh, László Dobos, Maraston, Ostriker, Padmanabhan, Postman, Sandage, Sandage, Sandage, Scott, Stanford, Stoughton, van Dokkum, von der, Wake, Whiley, Wolf, York   +50 more
core   +2 more sources