207 citations · 2.4k across the 108 of their papers we have counts for
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The Mass Function of Void Groups as a Probe of the Primordial non-Gaussianity
Hyunmi Song, Jounghun Lee
The primordial non-Gaussianity signal, if measured accurately, will allow us to distinguish between different candidate models for the cosmic inflation. Since the galaxy groups loc…
Information Content in the Galaxy Angular Power Spectrum from the Sloan Digital Sky Survey and Its Implication on Weak Lensing Analysis
Jounghun Lee, Ue-Li Pen
We analyze the photometric redshift catalog of the Sloan Digital Sky Survey Data Release 5 (SDSS DR5) to estimate the Fisher information in the galaxy angular power spectrum with t…
Connecting the Physical Properties of Galaxies with the Overdensity and Tidal Shear of the Large-Scale Environment
Jounghun Lee, Cheng Li
We have examined the correlations between the large-scale environment of galaxies and their physical properties, using a sample of 28,354 nearby galaxies drawn from the Sloan Digit…
The Variation of Galaxy Morphological Type with the Shear of Environment
Jounghun Lee, Bomee Lee
Recent N-body simulations have shown that the assembly history of galactic halos depend on the density of large-scale environment. It implies that the galaxy properties like age an…
The Size Distribution of Void Filaments in a LCDM Cosmology
Daeseong Park, Jounghun Lee
The size distribution of mini-filaments in voids has been derived from the Millennium Run halo catalogs at redshifts z=0,0.5,1 and 2. It is assumed that the primordial tidal field…
Quantifying the Cosmic Web I: The large-scale halo ellipticity-ellipticity and ellipticity-direction correlations
Jounghun Lee, Volker Springel, Ue-Li Pen +1
The formation of dark matter halos tends to occur anisotropically along the filaments of the Cosmic Web, which induces both ellipticity-ellipticity (EE) correlations between the sh…
Comparison between the Blue and the Red Galaxy Alignments Detected in the Sloan Digital Sky Survey
Jounghun Lee, Ue-Li Pen
We measure the intrinsic alignments of the blue and the red galaxies separately by analyzing the spectroscopic data of the Sloan Digital Sky Survey Data Release 6 (SDSS DR6). For b…
The Nonlinear Evolution of Galaxy Intrinsic Alignments
Jounghun Lee, Ue-Li Pen
The non-Gaussian contribution to the intrinsic halo spin alignments is analytically modeled and numerically detected. Assuming that the growth of non-Gaussianity in the density flu…
The Alignments of the Galaxy Spins with the Real-Space Tidal Field Reconstructed from the Two Mass Redshift Survey
Jounghun Lee, Pirin Erdogdu
We report a direct observational evidence for the existence of the galaxy spin alignments with the real space tidal field. We calculate the real space tidal field from the real spa…
Reconstructing the Intrinsic Triaxial Shape of the Virgo Cluster
Bomee Lee, Jounghun Lee
To use galaxy clusters as a cosmological probe, it is important to account for their triaxiality. Assuming that the triaxial shapes of galaxy clusters are induced by the tidal inte…
Constraining the Dark Energy Equation of State with Cosmic Voids
Jounghun Lee, Daeseong Park
Our universe is observed to be accelerating due to the dominant dark energy with negative pressure. The dark energy equation of state (w) holds a key to understanding the ultimate…
Evolution of the Pancaking Effect in a LCDM Cosmology
Yookyung Noh, Jounghun Lee
We explore the evolution of the large-scale anisotropy in the velocity field caused by the gravitational pancaking effect assuming a LCDM universe. The Millennium Run halo catalogs…
Void-Supercluster Alignments
Daeseong Park, Jounghun Lee
We investigate alignments between the spin axes of cosmic voids and the principal axes of nearby superclusters using the Millennium Run simulation of a LCDM cosmology. The concept…
Void Ellipticity Distribution as a Probe of Cosmology
Daeseong Park, Jounghun Lee
Cosmic voids refer to the large empty regions in the universe with a very low number density of galaxies. Voids are likely to be severely disturbed by the tidal effect from the sur…
Cluster-Supercluster Alignments
Jounghun Lee, August E. Evrard
We study correlations in spatial orientation between galaxy clusters and their host superclusters using a Hubble Volume N-body realization of a concordance cosmology and an analyti…
Rotation of Cosmic Voids and Void-Spin Statistics
Jounghun Lee, Daeseong Park
We present a theoretical study of void spins and their correlation properties. The concept of the spin angular momentum for an unbound void is introduced to quantify the effect of…
The Anisotropy in the Galaxy Velocity Field Originated from the Gravitational Pancaking Effect
Yookyung Noh, Jounghun Lee
We analyze the Millennium run semi-analytic galaxy catalog to explore quantitatively the gravitational pancaking effect on the orientation of galaxy velocity field. We first calcul…
A Cosmological Mass Function with Broken Hierarchy
Jounghun Lee
We construct an analytic formalism for the mass function of cold dark matter halos, assuming that there is a break in the hierarchical merging process. According to this {\it broke…
The Three Dimensional Structural Shape of the Gravitational Potential in the Local Group
Bomee Lee, Jounghun Lee
The Local Group is a small galaxy cluster with the membership of 62 nearby galaxies including the Milky Way and M31. Although the Local Group has yet to be virialized, it interacts…
On the Environmental Dependence of Galaxy Properties Established by the Initial Cosmological Conditions
Jounghun Lee
We study theoretically how the initial cosmological conditions establish the dependence of galaxy properties on the environment. First, we adopt the linear tidal torque theory acco…
The Alignments of Disk Galaxies with the Local Pancakes
Yookyung Noh, Jounghun Lee
We analyze the Tully catalog of nearby galaxies to investigate the local pancaking effect on the orientation of disk galaxies. We first select only those edge-on disk galaxies in t…
The Axis-Ratio Distribution of Galaxy Clusters in the SDSS-C4 Catalog as a New Cosmological Probe
Jounghun Lee
We analyze the C4 catalog of galaxy clusters from the Sloan Digital Sky Survey (SDSS) to investigate the axis-ratio distribution of the projected two dimensional cluster profiles.…
Reconstructing the Triaxial Shapes of Dark Matter Halos from the Anisotropic Spatial Distributions of their Substructures in the Concordance Cosmology
Jounghun Lee, Xi Kang
We develop an algorithm to reconstruct the triaxial shapes of dark matter halos from the anisotropic spatial distributions of their substructures for the concordance background cos…
An Analytic Model for the Axis-Ratio Distribution of Dark Matter Halos from the Primordial Gaussian Density Field
Jounghun Lee, Yipeng Jing, Yasushi Suto
We present an analytic expression for the axis ratio distribution of triaxial dark matter halos driven from physical principles. Adopting the picture of triaxial collapse based on…