Zobrazeno 1 - 10
of 346
pro vyhledávání: '"H, Kamaya"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 339:1256-1264
We study the prospects for observing H$_2$ and HD emission during the assembly of primordial molecular cloud cores. The primordial molecular cloud cores, which resemble those at the present epoch, can emerge around $1+z \sim 20$ according to recent n
Publikováno v:
Astronomy & Astrophysics. 366:83-90
Infrared (IR) dust emission from galaxies is frequently used as an indicator of star formation rate (SFR). However, the effect of the dust-to-gas ratio (i.e., amount of the dust) on the conversion law from IR luminosity to SFR has not so far been con
Publikováno v:
Publications of the Astronomical Society of Japan. 52:539-543
We construct a new algorithm for estimating the star formation rate (SFR) of galaxies from their infrared (IR) luminosity by developing the theory of the IR emission from a dusty H II region. The derived formula is ${\rm SFR}/(\MO {\rm yr^{-1}})=\{3.
Publikováno v:
Symposium - International Astronomical Union. 192:402-408
We investigate the dark matter (DM) content in the Local Group dwarf spheroidal galaxies (dSphs) by examining the correlations among their physical quantities. Two origins of the large velocity dispersions of the dSphs are possible: [1] the existence
Publikováno v:
Journal of Luminescence. 55:71-77
The intensity and anisotropy of fluorescence induced by static external electric field at a general orientation are studied based on the simplified model of optical transition for a frozen random system. Formulas are explicitly derived for four diffe
Autor:
H. Kamaya, Masakazu A. R. Kobayashi
The expected episodic or intermittent star formation histories (SFHs) of gas rich dwarf irregular galaxies (dIrrs) are the longstanding puzzles to understand their whole evolutional history. Solving this puzzle, we should grasp what physical mechanis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::052400af61d04c96db5b178c89ba5b16
Publikováno v:
Second IEEE International Conference on Computational Cybernetics, 2004. ICCC 2004..
In POMDP (partially observable Markov decision process) environments, a learning agent cannot observe the environment directly, thus partially observed states appeared. In order to overcome this partially observable problem, we had proposed a new RL
This paper investigates the origin of the observed large variety in dust-to-gas ratio among blue compact dwarf galaxies (BCDs). By applying our chemical evolution model, we find that the dust destruction can largely suppress the dust-to-gas ratio whe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70c5aff9cf20131c351868560183f4c3
http://arxiv.org/abs/astro-ph/0204316
http://arxiv.org/abs/astro-ph/0204316
Autor:
H. Kamaya, Y. Y. Tajiri
We investigate the star-formation history of gas-rich dwarf galaxies, taking account of the dynamical evolution of their neutral hydrogen (H{\sc i}) envelope. Gas-rich dwarfs are classified into blue compact dwarfs (BCDs) and dwarf irregulars (dIrrs)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7884b3103bd418612fe99feac29818d1
Autor:
H. Kamaya, Hiroyuki Hirashita
We propose a limit-cycle scenario of star formation history for any morphological type of spiral galaxies. It is known observationally that the early-type spiral sample has a wider range of the present star formation rate (SFR) than the late-type sam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b3086aac0f2053b328f13ab3b9c7a89