Results 141 to 150 of about 88,791 (299)

GLOBULAR CLUSTER SYSTEMS IN BRIGHTEST CLUSTER GALAXIES. II. NGC 6166 [PDF]

, 2015
We present new deep photometry of the globular cluster system (GCS) around NGC 6166, the central supergiant galaxy in Abell 2199. Hubble Space Telescope data from the Advanced Camera for Surveys and WFC3 cameras in F475W and F814W are used to determine ...
W. Harris, J. Blakeslee, B. Whitmore, O. Gnedin, D. Geisler, Barry Rothberg   +5 more
semanticscholar   +1 more source

Evolution of Massive Red Galaxies in Clusters from z = 1.0 to z = 0.3

The Astronomical Journal
A critical issue in studying the evolution of galaxy clusters is to find ways that enable meaningful comparisons of clusters observed at different redshifts, as well as in various stages of their growth.
Yen-Ting Lin, Kai-Feng Chen, Tsung-Chi Chen, Chen-Yu Chuang, Masamune Oguri   +4 more
doaj   +1 more source

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research, Volume 6, Issue 6, June 2025.
This article uses an optical lens to emulate the gravitational lensing effect and observe the Einstein ring (ER) patterns. The symmetry‐breaking ER, i.e., Einstein cross, is observed utilizing a rotation‐symmetry‐breaking hemi‐ellipsoid lens. Deformed Einstein cross patterns induced by noncollinearly alignment of the light source–lens–observer are ...
Jun‐Liang Duan, Wen Xiao, Minyong Guo, Tong Liu, Huanyang Chen, Jin‐Hui Chen   +5 more
wiley   +1 more source

Reexamination of the CO Absorption Line in the M87 Nucleus

The Astrophysical Journal
We analyzed the archival Atacama Large Millimeter/submillimeter Array data of the nuclear region of M87 and evaluated the molecular gas content from the CO(2–1) absorption line.
Norita Kawanaka, Hiroshi Nagai, Yutaka Fujita   +2 more
doaj   +1 more source

High-redshift Merger-induced Bar-like Galaxies in IllustrisTNG

The Astrophysical Journal Letters
Recent discoveries made with JWST observations include a significant number of barred galaxies at high redshift. Their origin remains unclear, and their presence seems difficult to reproduce in cosmological simulations of galaxy formation and evolution ...
Ewa L. Łokas
doaj   +1 more source

The Outer Halos of Very Massive Galaxies: BCGs and their DSC in the Magneticum Simulations

Galaxies, 2017
Recent hydrodynamic cosmological simulations cover volumes up to Gpc 3 and resolve halos across a wide range of masses and environments, from massive galaxy clusters down to normal galaxies, while following a large variety of physical processes ...
Rhea-Silvia Remus, Klaus Dolag, Tadziu L. Hoffmann   +2 more
doaj   +1 more source

The luminosities of the brightest cluster galaxies and brightest satellites in SDSS groups

, 2012
We show that the distribution of luminosities of Brightest Cluster Galaxies in an SDSS-based group catalog suggests that BCG luminosities are just the statistical extremes of the group galaxy luminosity function.
Aseem Paranjape, Bautz, Berlind, Bernardi, Bernardi, Bhavsar, Blanton, Cooray, De Lucia, Dobos, Hansen, Hubble, Lin, Loh, Milosavljević, Ravi K. Sheth, Sandage, Schechter, Scott, Sheth, Sheth, Skibba, Tremaine, Yang, Zehavi, Zehavi   +25 more
core   +1 more source

PEARLS: Globular Clusters and Ultracompact Dwarfs in the El Gordo Galaxies at z = 0.87

The Astrophysical Journal
JWST/NIRCam 0.9 to 2.0 μ m images reveal a population of point sources around the major galaxies in the El Gordo cluster at redshift z = 0.87. Their distribution in the color–magnitude diagrams shows a narrow sequence well separated from field-galaxy ...
William E. Harris, Marta Reina-Campos, Anton M. Koekemoer, Jessica M. Berkheimer, Timothy Carleton, Seth H. Cohen, Brenda L. Frye, Tyler R. Hinrichs, Benne W. Holwerda, Rachel Honor, Massimo Ricotti, S. P. Willner, Rogier A. Windhorst, Haojing Yan   +13 more
doaj   +1 more source

A Study of Catalogued Nearby Galaxy Clusters in the SDSS-DR4: I. Cluster Global Properties

, 2007
We have selected a sample of 88 nearby (z 800$ km s$^{-1}$). However, the local environment could play a key role in galaxy evolution for low mass clusters.Comment: 19 pages, 11 figures, accepted for publication in A&
Abraham, Adami, Adelman-McCarthy, Aguerri, Aguerri, Aguerri, Aguerri, Akritas, Andreon, Andreon, Andreon, Arnaboldi, Arnaboldi, Ashman, Balogh, Balogh, Beers, Bekki, Biviano, Biviano, Biviano, Blanton, Blanton, Borgani, Butcher, Böhringer, C. Muñoz-Tuñón, Carlberg, Castro-Rodríguez, Cole, Colless, Corwin, Curtis, Danese, De Propris, De Propris, den Hartog, Dressler, Dressler, Ebeling, Ebeling, Edge, Ellingson, Fadda, Fairley, Fasano, Fujita, Gallazzi, Girardi, Girardi, Goto, Goto, Gott, Gunn, Gutiérrez, Gómez, Haines, Hilton, Hogg, Hogg, Hubble, J. A. L. Aguerri, Katgert, Katgert, Kenney, Ledlow, Lewis, Lupton, Mahdavi, Mamon, Mamon, Margoniner, Margoniner, Mastropietro, Melnick, Metevier, Miller, Moore, Moss, Mulchaey, Muriel, Oemler, Ortiz-Gil, Pier, Pisani, Poggianti, Quilis, Quintana, R. Sánchez-Janssen, Rakos, Rines, Rines, Schlegel, Shimasaku, Smail, Sodre, Solanes, Stein, Strateva, Strauss, Tammann, Voges, Xue, Yahil, York, Zabludoff   +105 more
core   +1 more source

Discrepancies between JWST Observations and Simulations of Quenched Massive Galaxies at z > 3: A Comparative Study with IllustrisTNG and ASTRID

The Astrophysical Journal
Recent JWST observations have uncovered an unexpectedly large population of massive quiescent galaxies at z  > 3. Using the cosmological simulations IllustrisTNG and ASTRID , we identify analogous galaxies and investigate their abundance, formation ...
Emma Jane Weller, Fabio Pacucci, Yueying Ni, Lars Hernquist, Minjung Park   +4 more
doaj   +1 more source