Results 41 to 50 of about 15,250,094 (223)

What are protoclusters? – Defining high-redshift galaxy clusters and protoclusters [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
We explore the structures of protoclusters and their relationship with high redshift clusters using the Millennium Simulation combined with a semi-analytic model. We find that protoclusters are very extended, with 90 per cent of their mass spread across $\sim35\,h^{-1}{\rm Mpc}$ comoving at $z=2$ ($\sim30\, \rm{arcmin}$).
Muldrew, Stuart I., Hatch, N. A., Cooke, E. A.   +2 more
openaire   +4 more sources

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, Volume 347, Issue 6, July 2026.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

Clustering and redshift-space distortions in QSO and galaxy surveys [PDF]

, 2006
In this thesis, we exploit the potential of existing QSO and galaxy surveys for investigating the nature of the large scale structure in the Universe. A detailed analysis of clustering and redshift- space distortions allows us to constrain cosmological ...
Cruz da Angela, José Antonio, José Antonio Cruz da Angela   +1 more
core  

Evidence for a Redshifted Excess in the Intracluster Light Fractions of Merging Clusters at z ∼ 0.8

The Astrophysical Journal Letters
The intracluster light (ICL) fraction is a well-known indicator of the dynamical activity in intermediate-redshift clusters. Merging clusters in the redshift interval 0.18 < z < 0.56 have a distinctive peak in the ICL fractions measured between ∼3800 and
Yolanda Jiménez-Teja, Renato A. Dupke, Paulo A. A. Lopes, Paola Dimauro   +3 more
doaj   +1 more source

The SRG/eROSITA All-Sky Survey

Astronomy & Astrophysics
We selected galaxy cluster candidates from the high-redshift (BEST_Z > 0.9) end of the first SRG (Spectrum Roentgen Gamma)/eROSITA All-Sky Survey (eRASS1) galaxy cluster catalogue, for which we obtained moderately deep J-band imaging data with the ...
Zimmermann N., Kluge M., Grandis S., Schrabback T., Balzer F., Bulbul E., Comparat J., Csizi B., Ghirardini V., Jansen H., Kleinebreil F., Liu A., Merloni A., Ramos-Ceja M. E., Sanders J., Zhang X., Aschenbrenner P., Enescu F., Keiler S., Märk M., Rinner M., Schweitzer P., Silvestre-Rosello E., Stepman L.   +23 more
doaj   +1 more source

The $K$-band luminosity functions of galaxies in high-redshift clusters [PDF]

Proceedings of the International Astronomical Union, 2004
3 pages, to appear in Proceedings of IAU Colloquium 195 - Outskirts of Galaxy Clusters: intense life in the ...
Ellis, S. C., Jones, L. R.
openaire   +2 more sources

Slowly Rotating Traversable Wormholes Supported by Radially Varying String‐Fluid Matter: From Regular Geometries to Photon Trajectories

Annalen der Physik, Volume 538, Issue 6, June 2026.
This study examines slowly rotating traversable wormholes supported by string fluids whose properties change with radius. The matter smoothly shifts from a de Sitter‐like core to a string‐dominated exterior, producing a regular, horizon‐free spacetime.
A. Errehymy, B. Turimov, Meraj Ali Khan, S. Usanov, Z. Yasakov, Z. Avezmuratova   +5 more
wiley   +1 more source

The clustering of galaxies in hierarchical galaxy formation models [PDF]

, 2010
Galaxy clustering encodes information about the values of cosmological parameters and also about the physical processes behind galaxy formation and evolution. The GALFORM semi-analytical model is the theoretical approach we used to model galaxy formation.
KIM, HAN,SIK, Kim, Han Sik
core  

Quantifying the Velocity Anisotropy Profile of Galaxy Clusters Using the Uchuu Cosmological Simulation

The Astrophysical Journal
Galaxy clusters are powerful laboratories for studying both cosmic structure formation and galaxy evolution. We present a comprehensive analysis of the velocity anisotropy profile, β ( r ), in galaxy clusters using the Uchuu-UniverseMachine mock galaxy ...
Mohamed H. Abdullah, Raouf H. Mabrouk, Tomoaki Ishiyama, Gillian Wilson, Magdy Y. Amin, Elamira Hend Khattab, H. I. Abdel Rahman   +6 more
doaj   +1 more source

A Study of Nine High-Redshift Clusters of Galaxies. I. The Survey [PDF]

The Astronomical Journal, 1998
Accepted for publication in the Astronomical Journal.
Oke, J. B., Postman, Marc, Lubin, Lori
openaire   +2 more sources