Results 51 to 60 of about 49,160 (208)

Galaxy Clusters Selected via the Sunyaev–Zel'dovich Effect in the SPTpol 100-square-degree Survey [PDF]

, 2020
We present a catalog of galaxy cluster candidates detected in 100 square degrees surveyed with the SPTpol receiver on the South Pole Telescope. The catalog contains 89 candidates detected with a signal-to-noise ratio greater than 4.6.
Crites, A. T., Huang, N., Moran, C. Corbett, Padin, S.   +3 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

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, EarlyView.
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

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

Cluster detection from surface-brightness fluctuations in SDSS data [PDF]

, 2001
Galaxy clusters can be detected as surface brightness enhancements in smoothed optical surveys. This method does not require individual galaxies to be identifiable, and enables clusters to be detected out to surprisingly high redshifts, as recently ...
Aragón-Salamanca, Bahcall, Bahcall, Bartelmann, Brainerd, Carlberg, Carlberg, Carlberg, Dalcanton, Fukugita, Gonzalez, Hoessel, M. Bartelmann, Metcalfe, Navarro, Navarro, Postman, Postman, S. D. M. White, Schneider, van Dokkum, van Dokkum, Woods, Zaritsky, Zaritsky   +24 more
core   +2 more sources

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

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

A Closer Look at the Dynamical State of the High-redshift Galaxy Cluster SPT-CL J2215-3537

The Astrophysical Journal
We present a comprehensive reanalysis of the dynamical state of the high-redshift galaxy cluster SPT-CL J2215-3537 ( z = 1.16), using the full set of available Chandra observations to characterize the thermodynamic and morphological properties of the ...
Vinicius S. Bessa, Renato A. Dupke, Yolanda Jiménez-Teja   +2 more
doaj   +1 more source

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

Annalen der Physik, Volume 538, Issue 1, January 2026.
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