Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Yahagi, Hideki"'
We explore the radial alignment of subhalos in 2-dimensional projections of cosmological simulations. While most other recent studies focussed on quantifying the signal utilizing the full 3-dimensional spatial information any comparison to observatio
Externí odkaz:
http://arxiv.org/abs/0805.1823
Autor:
Bekki, Kenji, Yahagi, Hideki
Publikováno v:
Mon.Not.Roy.Astron.Soc.372:1019-1333,2006
We investigate structural properties of old, metal-poor globular clusters (GCs) formed at high redshifts (z>6) and located inside and outside virialized galaxy-scale halos in clusters of galaxies with the total masses of M_CL based on high-resolution
Externí odkaz:
http://arxiv.org/abs/astro-ph/0608238
Publikováno v:
Astrophys.J. 645 (2006) L29-L32
Using high-resolution numerical simulations, we investigate mass- and luminosity-normalized specific frequencies (T_N and S_N, respectively) of globular cluster systems (GCSs) in order to understand the origin of the observed U-shaped relation betwee
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605585
Autor:
Yahagi, Hideki, Bekki, Kenji
Publikováno v:
Mon.Not.Roy.Astron.Soc.Lett.364:L86-L90,2005
We first present the results of numerical simulations on formation processes and physical properties of old globular clusters (GCs) located within clusters of galaxies (``intracluster GCs'') and in between clusters of galaxies (``intercluster GCs'').
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509744
Autor:
Kashikawa, Nobunari, Yoshida, Makiko, Shimasaku, Kazuhiro, Nagashima, Masahiro, Yahagi, Hideki, Ouchi, Masami, Matsuda, Yuichi, Malkan, Matthew A., Doi, Mamoru, Iye, Masanori, team, the SDF
Publikováno v:
Astrophys.J.637:631-647,2006
We explored the clustering properties of Lyman Break Galaxies (LBGs) at z=4 and 5 with an angular two-point correlation function on the basis of the very deep and wide Subaru Deep Field data. We found an apparent dependence of the correlation functio
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509564
Publikováno v:
Astrophys.J.634:26-50,2005
We construct the Numerical Galaxy Catalog ($\nu$GC), based on a semi-analytic model of galaxy formation combined with high-resolution N-body simulations in a $\Lambda$-dominated flat cold dark matter ($\Lambda$CDM) cosmological model. The model inclu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0508085
Autor:
Yahagi, Hideki
In this paper, we describe our vectorized and parallelized adaptive mesh refinement (AMR) N-body code with shared time steps, and report its performance on a Fujitsu VPP5000 vector-parallel supercomputer. Our AMR N-body code puts hierarchical meshes
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507339
Publikováno v:
Astrophys.J. 605 (2004) 709-713
The mass function of dark halos in a Lambda-dominated cold dark matter (LambdaCDM) universe is investigated. 529 output files from five runs of N-body simulations are analyzed using the friends-of-friends cluster finding algorithm. All the runs use 5
Externí odkaz:
http://arxiv.org/abs/astro-ph/0401097
Autor:
Shirasaki, Yuji, Matsuzaki, Ei-ichi, Mizumoto, Yoshihiko, Kakimoto, Fumio, Ogio, Syoichi, Yasuda, Naoki, Tanaka, Masahiro, Yahagi, Hideki, Nagashima, Masahiro, Kosugi, George
It has been suggested that cosmic strings produced at a phase transition in the early universe can be the origin of the extremely high energy cosmic rays (EHCR) observed by AGASA above 10^20 eV. Superheavy cosmic strings with linear mass density of 1
Externí odkaz:
http://arxiv.org/abs/astro-ph/0305353
Autor:
Yahagi, Hideki, Yoshii, Yuzuru
Publikováno v:
Astrophys.J. 558 (2001) 463-475
We have developed a simulation code with the techniques which enhance both spatial and time resolution of the PM method for which the spatial resolution is restricted by the spacing of structured mesh. The adaptive mesh refinement (AMR) technique sub
Externí odkaz:
http://arxiv.org/abs/astro-ph/0105098