Zobrazeno 1 - 10
of 476
pro vyhledávání: '"Umemura, Masayuki"'
Autor:
Takahashi, Rohta, Umemura, Masayuki, Ohsuga, Ken, Asahina, Yuta, Takeda, Rintaro, Takahashi, Mikiya M., Kawanaka, Norita, Konno, Kohkichi, Nagasawa, Tomoaki
Publikováno v:
The Astrophysical Journal Letters, 967, L10 (2024)
We have discovered analytical expressions for the probability density function (PDF) of photons that are multiply scattered in relativistic flows, under the assumption of isotropic and inelastic scattering. These expressions characterize the collecti
Externí odkaz:
http://arxiv.org/abs/2405.10484
The homochirality of biological molecules on the Earth is a long-standing mystery regarding the origin of life. Circularly polarized ultraviolet (UV) light could induce the enantiomeric excess of biological molecules in the interstellar medium, leadi
Externí odkaz:
http://arxiv.org/abs/2306.12101
Autor:
Xu, Yi, Ouchi, Masami, Isobe, Yuki, Nakajima, Kimihiko, Ozaki, Shinobu, Bouché, Nicolas F., Wise, John H., Emsellem, Eric, Kusakabe, Haruka, Hattori, Takashi, Nagao, Tohru, Chiaki, Gen, Fukushima, Hajime, Harikane, Yuichi, Hayashi, Kohei, Hirai, Yutaka, Kim, Ji Hoon, Maseda, Michael V., Nagamine, Kentaro, Shibuya, Takatoshi, Sugahara, Yuma, Yajima, Hidenobu, Aoyama, Shohei, Fujimoto, Seiji, Fukushima, Keita, Hatano, Shun, Inoue, Akio K., Ishigaki, Tsuyoshi, Kawasaki, Masahiro, Kojima, Takashi, Komiyama, Yutaka, Koyama, Shuhei, Koyama, Yusei, Lee, Chien-Hsiu, Matsumoto, Akinori, Mawatari, Ken, Moriya, Takashi J., Motohara, Kentaro, Murai, Kai, Nishigaki, Moka, Onodera, Masato, Ono, Yoshiaki, Rauch, Michael, Saito, Tomoki, Sasaki, Rin, Suzuki, Akihiro, Takeuchi, Tsutomu T., Umeda, Hiroya, Umemura, Masayuki, Watanabe, Kuria, Yabe, Kiyoto, Zhang, Yechi
Publikováno v:
The Astrophysical Journal, Volume 961, Number 1, January 2024, Page 49-53
We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of $0.015-0.195~Z_\odot$ and low stellar masses of $10^4-10^8~M_\odot$ in the local universe. We conduct deep optical integral-
Externí odkaz:
http://arxiv.org/abs/2303.12467
Autor:
Takahashi, Mikiya M., Ohsuga, Ken, Takahashi, Rohta, Ogawa, Takumi, Umemura, Masayuki, Asahina, Yuta
We develop the 3-dimensional general relativistic radiative transfer code: CARTOON (Calculation code of Authentic Radiative Transfer based On phOton Number conservation in curved space-time) which is improved from the 2-dimensional code: ARTIST devel
Externí odkaz:
http://arxiv.org/abs/2210.00686
Autor:
Isobe, Yuki, Ouchi, Masami, Nakajima, Kimihiko, Ozaki, Shinobu, Bouche, Nicolas F., Wise, John H., Xu, Yi, Emsellem, Eric, Kusakabe, Haruka, Hattori, Takashi, Nagao, Tohru, Chiaki, Gen, Fukushima, Hajime, Harikane, Yuichi, Hayashi, Kohei, Hirai, Yutaka, Kim, Ji Hoon, Maseda, Michael V., Nagamine, Kentaro, Shibuya, Takatoshi, Sugahara, Yuma, Yajima, Hidenobu, Aoyama, Shohei, Fujimoto, Seiji, Fukushima, Keita, Hatano, Shun, Inoue, Akio K., Ishigaki, Tsuyoshi, Kawasaki, Masahiro, Kojima, Takashi, Komiyama, Yutaka, Koyama, Shuhei, Koyama, Yusei, Lee, Chien-Hsiu, Matsumoto, Akinori, Mawatari, Ken, Moriya, Takashi J., Motohara, Kentaro, Murai, Kai, Nishigaki, Moka, Onodera, Masato, Ono, Yoshiaki, Rauch, Michael, Saito, Tomoki, Sasaki, Rin, Suzuki, Akihiro, Takeuchi, Tsutomu T., Umeda, Hiroya, Umemura, Masayuki, Watanabe, Kuria, Yabe, Kiyoto, Zhang, Yechi
We present kinematics of 6 local extremely metal-poor galaxies (EMPGs) with low metallicities ($0.016-0.098\ Z_{\odot}$) and low stellar masses ($10^{4.7}-10^{7.6} M_{\odot}$). Taking deep medium-high resolution ($R\sim7500$) integral-field spectra w
Externí odkaz:
http://arxiv.org/abs/2206.04709
Autor:
Matsumoto, Akinori, Ouchi, Masami, Nakajima, Kimihiko, Kawasaki, Masahiro, Murai, Kai, Motohara, Kentaro, Harikane, Yuichi, Ono, Yoshiaki, Kushibiki, Kosuke, Koyama, Shuhei, Aoyama, Shohei, Konishi, Masahiro, Takahashi, Hidenori, Isobe, Yuki, Umeda, Hiroya, Sugahara, Yuma, Onodera, Masato, Nagamine, Kentaro, Kusakabe, Haruka, Hirai, Yutaka, Moriya, Takashi J., Shibuya, Takatoshi, Komiyama, Yutaka, Fukushima, Keita, Fujimoto, Seiji, Hattori, Takashi, Hayashi, Kohei, Inoue, Akio K., Kikuchihara, Shotaro, Kojima, Takashi, Koyama, Yusei, Lee, Chien-Hsiu, Mawatari, Ken, Miyata, Takashi, Nagao, Tohru, Ozaki, Shinobu, Rauch, Michael, Saito, Tomoki, Suzuki, Akihiro, Takeuchi, Tsutomu T., Umemura, Masayuki, Xu, Yi, Yabe, Kiyoto, Zhang, Yechi, Yoshii, Yuzuru
The primordial He abundance $Y_\mathrm{P}$ is a powerful probe of cosmology. Currently, $Y_\mathrm{P}$ is best determined by observations of metal-poor galaxies, while there are only a few known local extremely metal-poor ($<0.1 Z_\odot$) galaxies (E
Externí odkaz:
http://arxiv.org/abs/2203.09617
We develop a new three-dimensional time-dependent radiative transfer code, TRINITY (Time-dependent Radiative transfer In Near-Infrared TomographY), for in-vivo diffuse optical tomography (DOT). The simulation code is based on the design of long radia
Externí odkaz:
http://arxiv.org/abs/2105.01028
Near infrared diffuse optical tomography (DOT) provides an imaging modality for the oxygenation of tissue. In this paper, we propose a novel machine learning algorithm based on time-domain radiative transfer equation. We use temporal profiles of abso
Externí odkaz:
http://arxiv.org/abs/2011.12520
We explore the induction of circular polarization (CP) of near-infrared light in star-forming regions using three-dimensional radiative transfer calculations. The simulations trace the change of Stokes parameters at each scattering/absorption process
Externí odkaz:
http://arxiv.org/abs/2006.06370
Autor:
Kojima, Takashi, Ouchi, Masami, Rauch, Michael, Ono, Yoshiaki, Nakajima, Kimihiko, Isobe, Yuki, Fujimoto, Seiji, Harikane, Yuichi, Hashimoto, Takuya, Hayashi, Masao, Komiyama, Yutaka, Kusakabe, Haruka, Kim, Ji Hoon, Lee, Chien-Hsiu, Mukae, Shiro, Nagao, Tohru, Onodera, Masato, Shibuya, Takatoshi, Sugahara, Yuma, Umemura, Masayuki, Yabe, Kiyoto
We present element abundance ratios and ionizing radiation of local young low-mass (~$10^{6}$ M_sun) extremely metal poor galaxies (EMPGs) with a 2% solar oxygen abundance (O/H)_sun and a high specific star-formation rate (sSFR~300 Gyr$^{-1}$), and o
Externí odkaz:
http://arxiv.org/abs/2006.03831