Zobrazeno 1 - 10
of 237
pro vyhledávání: '"Omukai K"'
Autor:
Sassano, F., Schneider, R., Valiante, R., Inayoshi, K., Chon, S., Omukai, K., Mayer, L., Capelo, P. R.
Observations of hyper-luminous quasars at $z>6$ reveal the rapid growth of supermassive black holes (SMBHs $>10^9 \rm M_{\odot}$) whose origin is still difficult to explain. Their progenitors may have formed as remnants of massive, metal free stars (
Externí odkaz:
http://arxiv.org/abs/2106.08330
The early evolution of protostellar disks with metallicities in the $Z=1.0-0.01~Z_\odot$ range was studied with a particular emphasis on the strength of gravitational instability and the nature of protostellar accretion in low-metallicity systems. Nu
Externí odkaz:
http://arxiv.org/abs/2006.16598
Autor:
Egami, E., Gallerani, S., Schneider, R., Pallottini, A., Vallini, L., Sobacchi, E., Ferrara, A., Bianchi, S., Bocchio, M., Marassi, S., Armus, L., Spinoglio, L., Blain, A. W., Bradford, M., Clements, D. L., Dannerbauer, H., Fernández-Ontiveros, J. A., González-Alfonso, E., Griffin, M. J., Gruppioni, C., Kaneda, H., Kohno, K., Madden, S. C., Matsuhara, H., Najarro, P., Nakagawa, T., Oliver, S., Omukai, K., Onaka, T., Pearson, C., Perez-Fournon, I., Pérez-González, P. G., Schaerer, D., Scott, D., Serjeant, S., Smith, J. D., van der Tak, F. F. S., Wada, T., Yajima, H.
With the recent discovery of a dozen dusty star-forming galaxies and around 30 quasars at z>5 that are hyper-luminous in the infrared ($\mu$$L_{\rm IR}>10^{13}$ L$_{\odot}$, where $\mu$ is a lensing magnification factor), the possibility has opened u
Externí odkaz:
http://arxiv.org/abs/1809.07710
We study the impact of star-forming mini-haloes, and the Initial Mass Function (IMF) of Population III (Pop III) stars, on the Galactic halo Metallicity Distribution Function (MDF) and on the properties of C-enhanced and C-normal stars at [Fe/H]<-3.
Externí odkaz:
http://arxiv.org/abs/1610.05777
Observations of quasars at $ z > 6$ suggest the presence of black holes with a few times $\rm 10^9 ~M_{\odot}$. Numerous models have been proposed to explain their existence including the direct collapse which provides massive seeds of $\rm 10^5~M_{\
Externí odkaz:
http://arxiv.org/abs/1509.07034
Primordial gas in protogalactic dark matter (DM) halos with virial temperatures Tvir > 10^4 K begins to cool and condense via atomic hydrogen. Provided this gas is irradiated by a strong ultraviolet (UV) flux and remains free of H2 and other molecule
Externí odkaz:
http://arxiv.org/abs/0804.3141
Autor:
Tsuribe, T., Omukai, K.
If a significant fraction of metals is in dust, star-forming cores with metallicity higher than a critical value ~10^{-6}-10^{-5}Z_sun are able to fragment by dust cooling, thereby producing low-mass cores. Despite being above the critical metallicit
Externí odkaz:
http://arxiv.org/abs/0802.0943
Autor:
Omukai, K.
First protostellar cores are young stellar objects in the earliest evolutionary stage. They are hydrostatic objects formed soon after the central portions of star-forming cores become optically thick to dust emission. We consider their characteristic
Externí odkaz:
http://arxiv.org/abs/0705.3300
Publikováno v:
Astrophys.J.657:849-859,2007
We examine observational characteristics of multi-phase turbulent flows in the diffuse interstellar medium (ISM) using a synthetic radiation field of atomic and molecular lines. We consider the multi-phase ISM which is formed by thermal instability u
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611874
Autor:
Tsuribe, T., Omukai, K.
Publikováno v:
Astrophys.J.642:L61-L64,2006
Dynamical collapse and fragmentation of low-metallicity cloud cores is studied using three-dimensional hydrodynamical calculations, with particular attention devoted whether the cores fragment in the dust-cooling phase or not. The cores become elonga
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603470