Results 61 to 70 of about 29,686 (260)

Structure of Brightest Cluster Galaxies and Intracluster Light [PDF]

The Astrophysical Journal Supplement Series, 2020
Abstract Observations of 170 local (z ≲ 0.08) galaxy clusters in the northern hemisphere have been obtained with the Wendelstein Telescope Wide Field Imager (WWFI). We correct for systematic effects such as point-spread function broadening, foreground star contamination, relative bias offsets, and charge persistence.
M. Kluge, B. Neureiter, A. Riffeser, R. Bender, C. Goessl, U. Hopp, M. Schmidt, C. Ries, N. Brosch   +8 more
openaire   +4 more sources

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

The Emergence of a Brightest Cluster Galaxy in a Protocluster Core at z = 2.24

The Astrophysical Journal
We report the detection of a pair of massive quiescent galaxies likely in the process of merging at the center of the spectroscopically confirmed, extremely massive protocluster BOSS1244 at z = 2.24 ± 0.02.
Dong Dong Shi, Xin Wang, Xian Zhong Zheng, Zheng Cai, Xiaohui Fan, Fuyan Bian, Harry I. Teplitz   +6 more
doaj   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, EarlyView.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Investigating the M GCS–M h Relation in the Most Massive Galaxies

The Astrophysical Journal, 2023
The relation between the total mass contained in the globular clusters of a galaxy and the mass of its dark-matter halo has been found observationally to be nearly linear over five decades of mass.
Veronika Dornan, William E. Harris
doaj   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, EarlyView.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Cross-correlation Weak Lensing of SDSS galaxy Clusters II: Cluster Density Profiles and the Mass--Richness Relation [PDF]

, 2007
We interpret and model the statistical weak lensing measurements around 130,000 groups and clusters of galaxies in the Sloan Digital Sky Survey presented by Sheldon et al. 2007 (Paper I).
Annis, James, Becker, Matthew R., Evrard, August E., Frieman, Joshua A., Johnston, David E., Koester, Benjamin P., McKay, Timothy A., Rozo, Eduardo, Sheldon, Erin S., Wechsler, Risa H.   +9 more
core   +3 more sources

Spectral Energy Distribution Fitting of Globular Clusters in NGC 4874: Masses and Metallicities

The Astrophysical Journal
In most nearby galaxies, photometry of the integrated light of their globular clusters (GCs) has been obtained in only two filters, yielding just a single color index.
Kate Hartman, William E. Harris, Jinoo Kim   +2 more
doaj   +1 more source

Ionized nebulae surrounding brightest cluster galaxies [PDF]

, 2007
We present IFU observations of six emission-line nebulae that surround the central galaxy of cool core clusters. Qualitatively similar nebulae are observed in cool core clusters even when the dynamics and possibly formation and excitation source are ...
A. C. Fabian, Allen, Allen, Allen, Augusto, Bayer-Kim, Becker, Benson, Blanton, Bîrzan, Böhringer, Böhringer, C. S. Crawford, Churazov, Conselice, Cowie, Cowie, Crawford, Crawford, Crawford, Donahue, Draine, Dupke, Ebeling, Ebeling, Edge, Edge, Edge, Egami, Fabian, Fabian, Fabian, Filippenko, Fisher, Gelderman, Gubanov, Hatch, Hatch, Heckman, Heckman, Hu, Hutchings, Jaffe, Jaffe, Johnstone, Johnstone, Johnstone, Kawano, Kennicutt, Leborgne, Loewenstein, Marković, McNamara, McNamara, N. A. Hatch, Osterbrock, Parma, Prandoni, Rafferty, Romanishin, Sabra, Salomé, Sarazin, Sarazin, Sarzi, Schaller, Sparks, Sparks, Struble, Tamura, Veilleux, Wilman, Wise   +72 more
core   +2 more sources

Parsec Scale Properties of Brightest Cluster Galaxies. [PDF]

Proceedings of The 9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting — PoS(IX EVN Symposium), 2009
6 pages, 2 figures. Contributed talk. To be published in the proceedings of "The 9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting", September 23-26, 2008, Bologna ...
Gabriele Giovannini, Marcello Giroletti, Elisabetta Liuzzo   +2 more
openaire   +3 more sources