Choi, Jun-Hwan, Nagamine, Kentaro
We investigate the effects of cosmological parameters and star formation (SF) models on the cosmic SF history using cosmological smoothed particle hydrodynamics (SPH) simulations based on the cold...
On the Feedback Efficiency of Active Galactic Nuclei (2009)
Kurosawa, Ryuichi, Proga, Daniel, Nagamine, Kentaro
(Abridged) We measure and analyze the energy, momentum, and mass feedback efficiencies due to radiation from AGN in relatively large scale outflows. Our measurements are based on the axisymmetric and...
Star Formation History of Dwarf Galaxies in Cosmological Hydrodynamic Simulations (2009)
We examine the past and current work on the star formation (SF) histories of dwarf galaxies in cosmological hydrodynamic simulations. The results obtained from different numerical methods are still...
Lee, Tae Song, Nagamine, Kentaro, Hernquist, Lars, Springel, Volker
We calculate the cross-correlation function (CCF) between damped Ly-alpha systems (DLAs) and Lyman break galaxies (LBGs) using cosmological hydrodynamic simulations at z=3. We compute the CCF with...
Choi, Jun-Hwan, Nagamine, Kentaro
We present the results of a numerical study on the effects of metal enrichment and metal cooling on galaxy formation and cosmic star formation (SF) history using cosmological hydrodynamic...
Incidence Rate of GRB-host-DLAs at High Redshift (2008)
Nagamine, Kentaro, Zhang, Bing, Hernquist, Lars
We study the incidence rate of damped Ly-a systems associated with the host galaxies of gamma-ray bursts (GRB-host-DLAs) as functions of neutral hydrogen column density (N_HI) and projected star...
Lyman-alpha Emitters and Lyman-break Galaxies at z=3-6 in Cosmological SPH Simulations (2008)
Nagamine, Kentaro, Ouchi, Masami, Springel, Volker, Hernquist, Lars
We study the properties of Lyman-alpha emitters (LAEs) and Lyman-break galaxies (LBGs) at z=3-6 using cosmological SPH simulations. We investigate two simple scenarios for explaining the observed...
DLAs and Galaxy Formation (2007)
Damped Lyman-alpha systems (DLAs) are useful probes of star formation and galaxy formation at high redshift. We study the physical properties of DLAs and their relationship to Lyman-break galaxies...
Distribution of damped Lyα absorbers in a Λ cold dark matter universe (2007)
Nagamine, Kentaro, Wolfe, Arthur M., Hernquist, Lars, Springel, Volker
Topology of structure in the Sloan Digital Sky Survey: model testing (2006)
Gott III, J. Richard, Hambrick, D. Clay, Vogeley, Michael S., Kim, Juhan, Park, Changbom, Choi, Yun-Young, ...
We measure the three-dimensional topology of large-scale structure in the Sloan Digital Sky Survey (SDSS). This allows the genus statistic to be measured with unprecedented statistical accuracy. The...
Nagamine, Kentaro, Ostriker, Jeremiah P., Fukugita, Masataka, Cen, Renyue
Taking three independent approaches, we investigate the simultaneous constraints set on the cosmic star formation history from various observations, including stellar mass density and extragalactic...
Nagamine, Kentaro, Cen, Renyue, Furlanetto, Steven R., Hernquist, Lars, Night, Christopher, Ostriker, Jeremiah P.
Cosmological hydrodynamic simulations have significantly improved over the past several years, and we have already shown that the observed properties of Lyman-break galaxies (LBGs) at z=3 can be...
Nagamine, Kentaro, Wolfe, Arthur M., Hernquist, Lars
We discuss the detectability of high-redshift galaxies via [CII] 158 micron line emission by coupling an analytic model with cosmological Smoothed Particle Hydrodynamics (SPH) simulations that are...
Distribution of Damped Lyman-alpha Absorbers in a Lambda Cold Dark Matter Universe (2005)
Nagamine, Kentaro, Wolfe, Arthur M., Hernquist, Lars, Springel, Volker
We present the results of a numerical study of a galactic wind model and its implications on the properties of damped Lyman-alpha absorbers (DLAs) using cosmological hydrodynamic simulations. We vary...
Lyman Break Galaxies at z = 4 - 6 in cosmological SPH Simulations (2005)
Night, Christopher, Nagamine, Kentaro, Springel, Volker, Hernquist, Lars
We perform a spectrophotometric analysis of galaxies at redshifts z = 4 - 6 in cosmological SPH simulations of a Lambda CDM universe. Our models include radiative cooling and heating by a uniform UV...
Massive galaxies in cosmological simulations: ultraviolet-selected sample at redshift z=2 (2005)
Nagamine, Kentaro, Cen, Renyue, Hernquist, Lars, Ostriker, Jeremiah P., Springel, Volker
Massive galaxies at Z = 2 in cosmological hydrodynamic simulations (2005)
Nagamine, Kentaro, Cen, Renyue, Hernquist, Lars, Ostriker, Jeremiah P., Springel, Volker
Comparing AMR and SPH cosmological simulations - I. Dark matter and adiabatic simulations (2005)
O'Shea, Brian W., Nagamine, Kentaro, Springel, Volker, Hernquist, Lars, Norman, Michael L.
Massive galaxies at redshift 2 in cosmological hydrodynamic simulations (2004)
Nagamine, Kentaro, Cen, Renyue, Hernquist, Lars, Ostriker, Jeremiah P., Springel, Volker
We study the properties of galaxies at z=2 in a Lambda cold dark matter universe, using two different types of hydrodynamic simulation methods -- Eulerian TVD and smoothed particle hydrodynamics...
Signatures of Galactic Superwinds: Inhomogeneous Metal Enrichment of the Lyman Alpha Forest (2004)
Cen, Renyue, Nagamine, Kentaro, Ostriker, Jeremiah P.
We investigate possible signatures of feedback from galactic superwinds on the metallicity of the Lyman alpha forest, using a set of high resolution hydrodynamic simulations of a Lambda cold dark...
Massive galaxies in cosmological simulations: UV-selected sample at redshift z=2 (2004)
Nagamine, Kentaro, Cen, Renyue, Hernquist, Lars, Ostriker, Jeremiah P., Springel, Volker
We study the properties of galaxies at z=2 in a Lambda CDM universe, using two different types of hydrodynamic simulation methods (Eulerian TVD and SPH) and a spectrophotometric analysis in the Un,...
Is there a missing galaxy problem at high redshift? (2004)
Nagamine, Kentaro, Cen, Renyue, Hernquist, Lars, Ostriker, Jeremiah P., Springel, Volker
Comparing AMR and SPH Cosmological Simulations: I. Dark Matter & Adiabatic Simulations (2003)
O'Shea, Brian W., Nagamine, Kentaro, Springel, Volker, Hernquist, Lars, Norman, Michael L.
We compare two cosmological hydrodynamic simulation codes in the context of hierarchical galaxy formation: The SPH code GADGET, and the Eulerian AMR code ENZO. Both codes represent dark matter with...
Is There a Missing Galaxy Problem at High Redshift? (2003)
Nagamine, Kentaro, Cen, Renyue, Hernquist, Lars, Ostriker, Jeremiah P., Springel, Volker
We study the evolution of the global stellar mass density in a Lambda cold dark matter universe using two different types of hydrodynamical simulations (Eulerian TVD and SPH) and the analytical model...
Photometric Properties of Lyman-break Galaxies at z=3 in Cosmological SPH Simulations (2003)
Nagamine, Kentaro, Springel, Volker, Hernquist, Lars, Machacek, Marie
We study the photometric properties of Lyman-break galaxies (LBGs) formed by redshift z=3 in a set of large cosmological smoothed-particle hydrodynamics simulations of the Lambda cold dark matter...
Damped Lyman-alpha Absorbers in Cosmological SPH Simulations: the "metallicity problem" (2003)
Nagamine, Kentaro, Springel, Volker, Hernquist, Lars
We study the distribution of star formation rate (SFR) and metallicity of damped Lyman-alpha absorbers (DLAs) using cosmological smoothed particle hydrodynamics (SPH) simulations of the Lambda cold...
Nagamine, Kentaro, Loeb, Abraham
We simulate the evolution of the intergalactic medium (IGM) in a universe dominated by a cosmological constant. We find that within a few Hubble times from the present epoch, the baryons will have...
Nagamine, Kentaro, Springel, Volker, Hernquist, Lars
We study the distribution of the star formation rate and metallicity of damped Lyman-alpha absorbers using cosmological SPH simulations of the Lambda cold dark matter model in the redshift range...
Ostriker, Jeremiah P., Nagamine, Kentaro, Cen, Renyue, Fukugita, Masataka
While second and higher order correlations of the light distribution have received extensive study, the lowest order probability distribution function (PDF) -- the probability that a unit volume of...
Abundance of damped Lyman-alpha absorbers in cosmological SPH simulations (2003)
Nagamine, Kentaro, Springel, Volker, Hernquist, Lars
We use cosmological smoothed-particle hydrodynamics (SPH) simulations of the Lambda cold dark matter (CDM) model to study the abundance of damped Lyman-alpha absorbers (DLAs) in the redshift range...
Nagamine, Kentaro, Loeb, Abraham
We simulate the future evolution of the observed inhomogeneities in the local universe assuming that the global expansion rate is dominated by a cosmological constant. We find that within two Hubble...
The Lyman Break Galaxies: their Progenitors and Descendants (2001)
We study the evolution of Lyman Break Galaxies (LBGs) from z=5 to z=0 by tracing the merger trees of galaxies in a large-scale hydrodynamic simulation based on a Lambda cold dark matter model. In...
Evolution of the Luminosity Function and Colors of Galaxies in a Lambda-CDM Universe (2001)
Nagamine, Kentaro, Fukugita, Masataka, Cen, Renyue, Ostriker, Jeremiah P.
The luminosity function of galaxies is derived from a cosmological hydrodynamic simulation of a Lambda cold dark matter (CDM) universe with the aid of a stellar population synthesis model. At z=0,...
Star Formation History and Stellar Metallicity Distribution in a Cold Dark Matter Universe (2000)
Nagamine, Kentaro, Fukugita, Masataka, Cen, Renyue, Ostriker, Jeremiah P.
We study star formation history and stellar metallicity distribution in galaxies in a Lambda cold dark matter universe using a hydrodynamic cosmological simulation. Our model predicts star formation...
Cosmic Mach Number as a Function of Overdensity and Galaxy Age (2000)
Nagamine, Kentaro, Ostriker, Jeremiah P., Cen, Renyue
We carry out an extensive study of the cosmic Mach number (\mach) on scales of R=5, 10 and 20h^-1Mpc using an LCDM hydrodynamical simulation. We particularly put emphasis on the environmental...
Dependence of Star Formation Rate on Overdensity (1999)
Nagamine, Kentaro, Cen, Renyue, Ostriker, Jeremiah P.
We use a large-scale Lambda-CDM hydrodynamical simulation to assess the dependence of the cosmic Star Formation Rate (SFR) on overdensity of luminosity. The `morphology-density relation' is...
Nagamine, Kentaro, Cen, Renyue, Ostriker, Jeremiah P.
We compute the cosmic star formation rate (SFR) and the rest-frame comoving luminosity density in various pass-bands as a function of redshift using large-scale \Lambda-CDM hydrodynamical simulations...
Kudoh, Jun, Nagamine, Kentaro, Asakawa, Shuichi, Abe, Izumi, Kawasaki, Kazuhiko, Maeda, Hideto, ...
As a step toward identifying the pathogenic genes for autoimmune polyglandular disease type I (APECED) and other disorders mapped to the PFKL locus on chromosome 21q22.3, we have constructed a...