273 citations · 2k across the 64 of their papers we have counts for
29 papers · 1 filter
Comparison of simulations and semi-analytical model for WDM subhalo mass functions
Mizuki Ono, Takashi Okamoto, Shin'ichiro Ando +1
The Cold Dark Matter (CDM) model successfully explains large-scale structure formation, but challenges remain at smaller scales, leading to interest in Warm Dark Matter (WDM) as an…
Quantifying the Velocity Anisotropy Profile of Galaxy Clusters Using the Uchuu Cosmological Simulation
Mohamed H. Abdullah, Raouf H. Mabrouk, Tomoaki Ishiyama +2
Galaxy clusters are powerful laboratories for studying both cosmic structure formation and galaxy evolution. We present a comprehensive analysis of the velocity anisotropy profile,…
Evolution of clustering in cosmological models with time-varying dark energy
Tomoaki Ishiyama, Francisco Prada, Anatoly A. Klypin
Observations favor cosmological models with a time-varying dark energy component. But how does dynamical dark energy (DDE) influence the growth of structure in an expanding Univers…
Baryon Pasting the Uchuu Lightcone Simulation
Erwin T. Lau, Daisuke Nagai, Arya Farahi +4
We present the Baryon Pasted (BP) X-ray and thermal Sunyaev-Zel'dovich (tSZ) maps derived from the half-sky Uchuu Lightcone simulation. These BP-Uchuu maps are constructed using mo…
Constraining cosmological parameters using void statistics from the SDSS survey
Elena Fernández-García, Juan E. Betancort-Rijo, Francisco Prada +2
We identify voids as maximal non-overlapping spheres within the haloes of the Uchuu simulation and three smaller halo simulation boxes with smaller volume and different val…
The Correlation Function and Detection of Baryon Acoustic Oscillation Peak from the Spectroscopic SDSS GalWCat Galaxy Cluster Catalogue
Mohamed H. Abdullah, Anatoly Klypin, Francisco Prada +3
We measure the two point correlation function (CF) of 1357 galaxy clusters with a mass of ~\hm~and at a redshift of . This work differs f…
The Uchuu-GLAM BOSS and eBOSS LRG lightcones: Exploring clustering and covariance errors
Julia Ereza, Francisco Prada, Anatoly Klypin +6
This study investigates the clustering and bias of Luminous Red Galaxies (LRG) in the BOSS-LOWZ, -CMASS, -COMB, and eBOSS samples, using two types of simulated lightcones: (i) high…
CONCERTO: Simulating the CO, [CII], and [CI] line emission of galaxies in a 117 field and the impact of field-to-field variance
A. Gkogkou, M. Béthermin, G. Lagache +29
In the submm regime, spectral line scans and line intensity mapping (LIM) are new promising probes for the cold gas content and star formation rate of galaxies across cosmic time.…
Constraining Cosmological Parameters using the Cluster Mass-Richness Relation
Mohamed H. Abdullah, Gillian Wilson, Anatoly Klypin +1
The cluster mass-richness relation (MRR) is an observationally efficient and potentially powerful cosmological tool for constraining the mean matter density of the universe and the…
The Uchuu-SDSS galaxy lightcones: a clustering, RSD and BAO study
C. A. Dong-Páez, A. Smith, A. O. Szewciw +11
We present the data release of the Uchuu-SDSS galaxies: a set of 32 high-fidelity galaxy lightcones constructed from the large Uchuu 2.1 trillion particle -body simulation using…
Semi-analytical frameworks for subhalos from the smallest to the largest scale
Nagisa Hiroshima, Shin'ichiro Ando, Tomoaki Ishiyama
Substructures of dark matter halo, called subhalos, provide important clues to understand the nature of dark matter. We construct a useful model to describe the properties of subha…
LCDM halo substructure properties revealed with high resolution and large volume cosmological simulations
Ángeles Moliné, Miguel A. Sánchez-Conde, Alejandra Aguirre-Santaella +8
We investigate the structural properties, distribution and abundance of LCDM dark matter subhaloes using the Phi-4096 and Uchuu suite of N-body cosmological simulations. Thanks to…
Virial halo mass function in the cosmology
Masato Shirasaki, Tomoaki Ishiyama, Shin'ichiro Ando
We study halo mass functions with high-resolution -body simulations under a CDM cosmology. Our simulations adopt the cosmological model that is consistent with recent measure…
The Uchuu Simulations: Data Release 1 and Dark Matter Halo Concentrations
Tomoaki Ishiyama, Francisco Prada, Anatoly A. Klypin +11
We introduce the Uchuu suite of large high-resolution cosmological -body simulations. The largest simulation, named Uchuu, consists of 2.1 trillion () dark matter parti…
Void Formation: Does the Void-in-Cloud Process Matter?
Hei Yin Jowett Chan, Masashi Chiba, Tomoaki Ishiyama
We investigate the basic properties of voids from high resolution, cosmological N-body simulations of Λ-dominated cold dark matter (ΛCDM) models, in order to compare with the analy…
The Abundance and Structure of Subhaloes near the Free Streaming Scale and Their Impact on Indirect Dark Matter Searches
Tomoaki Ishiyama, Shin'ichiro Ando
The free streaming motion of dark matter particles imprints a cutoff in the matter power spectrum and set the scale of the smallest dark matter halo. Recent cosmological -body s…
Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
Shin'ichiro Ando, Tomoaki Ishiyama, Nagisa Hiroshima
The presence of dark matter substructure will boost the signatures of dark matter annihilation. We review recent progress on estimates of this subhalo boost factor---a ratio of the…
Modeling evolution of dark matter substructure and annihilation boost
Nagisa Hiroshima, Shin'ichiro Ando, Tomoaki Ishiyama
We study evolution of dark matter substructures, especially how they lose the mass and change density profile after they fall in gravitational potential of larger host halos. We de…
Dynamical Evolution of Primordial Dark Matter Haloes through Mergers
Go Ogiya, Daisuke Nagai, Tomoaki Ishiyama
Primordial dark matter (DM) haloes are the smallest gravitationally bound DM structures from which the first stars, black holes, and galaxies form and grow in the early universe. H…
Japanese Cosmic Dawn/Epoch of Reionization Science with the Square Kilometre Array
Kenji Hasegawa, Shinsuke Asaba, Kiyotomo Ichiki +10
Cosmic reionization is known to be a major phase transition of the gas in the Universe. Since astronomical objects formed in the early Universe, such as the first stars, galaxies a…
The GC Simulations : Quantifying the Dark Side of the Universe in the Planck Cosmology
Tomoaki Ishiyama, Motohiro Enoki, Masakazu A. R. Kobayashi +3
We present the evolution of dark matter halos in six large cosmological N-body simulations, called the GC (New Numerical Galaxy Catalog) simulations on the basis of the LCDM c…
Constraints on warm dark matter from weak lensing in anomalous quadruple lenses
Kaiki Taro Inoue, Ryuichi Takahashi, Tomo Takahashi +1
We investigate the weak lensing effect by line-of-sight structures with a surface mass density of <~10^8 solar mass/arcsec^2 in QSO-galaxy quadruple lens systems. Using high-resolu…
Hierarchical Formation of Dark Matter Halos and the Free Streaming Scale
Tomoaki Ishiyama
The smallest dark matter halos are formed first in the early universe. According to recent studies, the central density cusp is much steeper in these halos than in larger halos and…
Evolution of star clusters in a cosmological tidal field
Steven Rieder, Tomoaki Ishiyama, Paul Langelaan +3
We present a method to couple N-body star cluster simulations to a cosmological tidal field, using the Astrophysical Multipurpose Software Environment. We apply this method to star…