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A sample of hundreds of simulated galaxy clusters is used to study the statistical properties of galaxy cluster formation. Individual assembly histories are discussed, the degree of virialization is demonstrated and various commonly used…

Astrophysics · Physics 2008-11-26 J. D. Cohn , Martin White

We perform a detailed investigation of the statistical properties of the projected distribution of galaxy clusters obtained in Cold Dark Matter (CDM) models with both Gaussian and skewed primordial density fluctuations. We use N-body…

Astrophysics · Physics 2015-06-24 S. Borgani , P. Coles , L. Moscardini , M. Plionis

Surveys of faint galaxies at high redshifts often result in a "pencil-beam" geometry that is much longer along the line-of-sight than across the sky. We explore the effects of this geometry on the abundance and clustering of Lyman-break…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 Joseph A. Muñoz , Hy Trac , Abraham Loeb

(abridged) We use a theoretical model to predict the clustering properties of galaxy clusters. Our technique accounts for past light-cone effects on the observed clustering and follows the non-linear evolution of the dark matter correlation…

Astrophysics · Physics 2009-10-31 Lauro Moscardini , Sabino Matarrese , H. J. Mo

Environmental statistics provide a necessary means of comparing the properties of galaxies in different environments and a vital test of models of galaxy formation within the prevailing, hierarchical cosmological model. We explore…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Heather D. Berrier , Elizabeth J. Barton , Joel C. Berrier , James S. Bullock , Andrew R. Zentner , Risa H. Wechsler

We study the physical properties, formation histories, and environment of galaxies without a significant "classical" spheroidal component, as predicted by semi-analytical models of galaxy formation and evolution. This work is complementary…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Fabio Fontanot , Gabriella De Lucia , David Wilman , Pierluigi Monaco

In this work, we present results for the photometric and clustering properties of galaxies that arise in a LambdaCDM hydrodynamical simulation of the local universe. The present-day distribution of matter was constructed to match the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 S. E. Nuza , K. Dolag , A. Saro

We study the stellar populations of bulges of Milky Way-like (MW-like) galaxies with the aim of identifying the physical processes involved in the formation of the bulge of our Galaxy. We use the semi-analytic model of galaxy formation and…

Astrophysics of Galaxies · Physics 2017-09-15 I. D. Gargiulo , S. A. Cora , C. A. Vega-Martínez , O. A. Gonzalez , M. Zoccali , R. González , A. N. Ruiz , N. D. Padilla

We investigate the effect of the cluster environment on the star formation properties of galaxies in 8 nearby Abell clusters. Star formation properties are determined for individual galaxies using the equivalent width of H alpha plus [NII]…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 C. F. Bretherton , P. A. James , C. Moss , M. Whittle

We present the results of a series of empirical computations regarding the role of major mergers in forming the stellar masses of modern galaxies based on measurements of galaxy merger and star formation histories from z~0.5-3. We…

Astrophysics · Physics 2009-11-13 Christopher J. Conselice

In Montero-Dorta et al. 2017, we show that luminous red galaxies (LRGs) from the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) at $z\sim0.55$ can be divided into two groups based on their star formation histories. So-called…

Cosmology and Nongalactic Astrophysics · Physics 2018-05-10 A. Niemiec , E. Jullo , A. D. Montero-Dorta , F. Prada , S. Rodriguez-Torres , E. Perez , A. Klypin , T. Erben , M. Makler , B. Moraes , M. E. S. Pereira , H. Shan

We explore the cosmological implications of anisotropic clustering measurements in configuration space of the final galaxy samples from Data Release 12 of the SDSS-III Baryon Oscillation Spectroscopic Survey. We implement a new detailed…

Modern hydrodynamic simulations of galaxy formation are able to predict accurately the rates and locations of the assembly of giant molecular clouds in early galaxies. These clouds could host star clusters with the masses and sizes of real…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Oleg Y. Gnedin

We use stripped-down versions of three semi-analytic galaxy formation models to study the influence of different assumptions about gas cooling and galaxy mergers. By running the three models on identical sets of merger trees extracted from…

Cosmology and Nongalactic Astrophysics · Physics 2011-09-07 Gabriella De Lucia , Michael Boylan-Kolchin , Andrew J. Benson , Fabio Fontanot , Pierluigi Monaco

Current and future large redshift surveys, as the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey (SDSS-IV/eBOSS) or the Dark Energy Spectroscopic Instrument (DESI), will use emission-line galaxies (ELG) to…

Clusters of galaxies are studied from a theoretical point of view, comparing with observational results whenever possible. The problem is approached both analytically as well as by means of high-resoultion numerical simulations. The dark…

Astrophysics · Physics 2007-05-23 Y. Ascasibar

We compare predictions for galaxy-galaxy lensing profiles and clustering from the Henriques et al. (2015) public version of the Munich semi-analytical model of galaxy formation (SAM) and the IllustrisTNG suite, primarily TNG300, with…

Cosmology and Nongalactic Astrophysics · Physics 2020-12-03 Malin Renneby , Bruno M. B. Henriques , Stefan Hilbert , Dylan Nelson , Mark Vogelsberger , Raúl E. Angulo , Volker Springel , Lars Hernquist

The infall and merger scenario of massive clusters in the Milky Way's potential well, as one of the Milky Way formation mechanisms, is reexamined to understand how the stars of the merging clusters are redistributed during and after the…

Astrophysics of Galaxies · Physics 2023-06-21 Maria Gabriela Navarro , Roberto Capuzzo-Dolcetta , Manuel Arca-Sedda , Dante Minniti

According to the current paradigm, galaxies form and reside in extended cold dark matter (CDM) halos and in turn are key tracers of cosmological structure. Understanding how different types of galaxies occupy halos of different masses is…

Astrophysics · Physics 2009-11-10 Ummi Abbas , Ravi K. Sheth

The spatial distribution of massive and luminous galaxies have provided important constraints on the fundamental cosmological parameters and physical processes governing galaxy formation. In this work, we construct and compare independent…

Cosmology and Nongalactic Astrophysics · Physics 2025-10-15 Zhongxu Zhai , Andrew Benson , Yun Wang
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