Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Okoshi, Katsuya"'
Autor:
Ishimoto, Rikako, Kashikawa, Nobunari, Kashino, Daichi, Ito, Kei, Liang, Yongming, Cai, Zheng, Yoshioka, Takehiro, Okoshi, Katsuya, Misawa, Toru, Onoue, Masafusa, Takeda, Yoshihiro, Uchiyama, Hisakazu
The large opacity fluctuations in the $z > 5.5$ Ly$\alpha$ forest may indicate inhomogeneous progress of reionization. To explain the observed large scatter of the effective Ly$\alpha$ optical depth ($\tau_{\rm eff}$) of the intergalactic medium (IGM
Externí odkaz:
http://arxiv.org/abs/2207.05098
Autor:
Misawa, Toru, Ishimoto, Rikako, Kobu, Satoshi, Kashikawa, Nobunari, Okoshi, Katsuya, Noboriguchi, Akatoki, Schramm, Malte, Liu, Qiang
We aim to find out the reason why there exists an anisotropic HI absorption around quasars; i.e., the environments around quasars are highly biased toward producing strong HI absorption in transverse direction while there exists a significant deficit
Externí odkaz:
http://arxiv.org/abs/2206.10871
Autor:
Okoshi, Katsuya, Minowa, Yosuke, Kashikawa, Nobunari, Misawa, Toru, Kashino, Daichi, Sugai, Hajime, Matsubayashi, Kazuya, Shimono, Atsushi, Ozaki, Shinobu
We find multiple Mg II absorption systems at redshift z=1.66, 2.069, and 2.097 in the spatially resolved spectra of the quadruply gravitationally lensed quasar H1413+1143 utilizing the Kyoto tridimensional spectrograph II (Kyoto 3DII) spectrograph on
Externí odkaz:
http://arxiv.org/abs/2110.01452
Autor:
Ogura, Kazuyuki, Nagashima, Masahiro, Shimakawa, Rhythm, Hayashi, Masao, Kobayashi, Masakazu A. R., Oogi, Taira, Ishiyama, Tomoaki, Koyama, Yusei, Makiya, Ryu, Okoshi, Katsuya, Onodera, Masato, Shirakata, Hikari
We construct a model of H$\alpha$ emitters (HAEs) based on a semi-analytic galaxy formation model, the New Numerical Galaxy Catalog ($\nu^2$GC). In this paper, we report our estimate for the field variance of the HAE distribution. By calculating the
Externí odkaz:
http://arxiv.org/abs/2004.00815
Autor:
Shirakata, Hikari, Okamoto, Takashi, Kawaguchi, Toshihiro, Nagashima, Masahiro, Ishiyama, Tomoaki, Makiya, Ryu, Kobayashi, Masakazu A. R., Enoki, Motohiro, Oogi, Taira, Okoshi, Katsuya
We present the latest results of a semi-analytic model of galaxy formation, "New Numerical Galaxy Catalogue", which is combined with large cosmological N-body simulations. This model can reproduce statistical properties of galaxies at z < 6.0. We foc
Externí odkaz:
http://arxiv.org/abs/1802.02169
Autor:
Koyamada, Suzuka, Misawa, Toru, Inada, Naohisa, Oguri, Masamune, Kashikawa, Nobunari, Okoshi, Katsuya
We study the internal structure of the Circum-Galactic Medium (CGM), using 29 spectra of 13 gravitationally lensed quasars with image separation angles of a few arcseconds, which correspond to 100 pc to 10 kpc in physical distances. After separating
Externí odkaz:
http://arxiv.org/abs/1711.08131
Autor:
Makiya, Ryu, Enoki, Motohiro, Ishiyama, Tomoaki, Kobayashi, Masakazu A. R., Nagashima, Masahiro, Okamoto, Takashi, Okoshi, Katsuya, Oogi, Taira, Shirakata, Hikari
We present a new cosmological galaxy formation model, $\nu^2$GC, as an updated version of our previous model $\nu$GC. We adopt the so-called "semi-analytic" approach, in which the formation history of dark matter halos is computed by ${\it N}$-body s
Externí odkaz:
http://arxiv.org/abs/1508.07215
Autor:
Kashikawa, Nobunari, Misawa, Toru, Minowa, Yosuke, Okoshi, Katsuya, Hattori, Takashi, Toshikawa, Jun, Ishikawa, Shogo, Onoue, Masafusa
We searched for star formation activity associated with high-z Damped Lyman-alpha systems (DLAs) with Subaru telescope. We used a set of narrow-band (NB) filters whose central wavelengths correspond to the redshifted Lyman-alpha emission lines of tar
Externí odkaz:
http://arxiv.org/abs/1311.5534
We performed multi-band deep imaging of the field around GRB 050730 to identify the host galaxies of intervening absorbers, which consist of a damped Ly{\alpha} absorption (DLA) system at zabs=3.564, a sub-DLA system at zabs=3.022, and strong MgII ab
Externí odkaz:
http://arxiv.org/abs/1207.5840
Autor:
Hamano, Satoshi, Kobayashi, Naoto, Kondo, Sohei, Tsujimoto, Takuji, Okoshi, Katsuya, Shigeyama, Toshikazu
Using the Subaru 8.2m Telescope with an IRCS Echelle spectrograph, we obtained high-resolution (R=10,000) near-infrared (1.01-1.38 \mu m) spectra of images A and B of the gravitationally lensed QSO B1422+231 (z=3.628) consisting of four known lensed
Externí odkaz:
http://arxiv.org/abs/1206.3646