1,194 research outputs found
Phase Field Model for Dynamics of Sweeping Interface
Motivated by the drying pattern experiment by Yamazaki and Mizuguchi[J. Phys.
Soc. Jpn. {\bf 69} (2000) 2387], we propose the dynamics of sweeping interface,
in which material distributed over a region is swept by a moving interface. A
model based on a phase field is constructed and results of numerical
simulations are presented for one and two dimensions. Relevance of the present
model to the drying experiment is discussed.Comment: 4 pages, 7 figure
Relationships between a roller and a dynamic pressure distribution in circular hydraulic jumps
We investigated numerically the relation between a roller and the pressure
distribution to clarify the dynamics of the roller in circular hydraulic jumps.
We found that a roller which characterizes a type II jump is associated with
two high pressure regions after the jump, while a type I jump (without the
roller) is associated with only one high pressure region. Our numerical results
show that building up an appropriate pressure field is essential for a roller.Comment: 10 pages, 7 PS files. To appear in PR
Experimental study of energy transport in thin Al and Au foils irradiated with a 263-nm laser
Copyright 1989 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics, 65(12), 5068-5071, 1989 and may be found at http://dx.doi.org/10.1063/1.34318
Crystal structure of carbonyl{hydridotris[3-phenyl-5-methylpyrazol-1-yl]borato-κ3N,N′N′′}copper(I), C31H28BCuN6O
C31H28BCuN6O, monoclinic, P21/n (no. 14), a = 11.506(3) Å, b = 16.122(3) Å, c = 15.805(3) Å, β = 99.433(3)°, V = 2892.2(11) Å3, Z = 4, Rgt(F) = 0.0501, wRref(F2) = 0.1260, T = 193(2) K
The Star Formation Rate and Metallicity of the Host Galaxy of the Dark GRB 080325 at z = 1.78
We present near-infrared spectroscopy of the host galaxy of the dark gamma-ray burst (GRB) 080325 using Subaru/Multi-Object Infrared Camera and Spectrograph. The obtained spectrum provides a clear detection of H emission and marginal [Nii]λ6584. The host is a massive (M∗ ∼ 1011 Mȯ), dusty (Av ∼ 1.2) star-forming galaxy at z = 1.78. The extinction-corrected star formation rate (SFR) calculated from the H luminosity (35.6-47.0 Mȯ yr-1) is typical among GRB host galaxies (and star-forming galaxies generally) at z > 1; however, the specific SFR is lower than for normal star-forming galaxies at redshift ∼1.6, in contrast to the high specific SFR measured for many of other GRB hosts. The metallicity of the host is estimated to be 12 + log(O/H)KK04 = 8.88. We emphasize that this is one of the most massive host galaxies at z > for which metallicity is measured with emission-line diagnostics. The metallicity is fairly high among GRB hosts, however, this is still lower than the metallicity of normal star-forming galaxies of the same mass at z ∼ 1.6. The metallicity offset from normal star-forming galaxies is close to a typical value of other GRB hosts and indicates that GRB host galaxies are uniformly biased toward low metallicity over a wide range of redshifts and stellar masses. The low-metallicity nature of the GRB 080325 host likely cannot be attributed to the fundamental metallicity relation of star-forming galaxies because it is a metal-poor outlier from the relation and has a low specific star formation rate. Thus, we conclude that metallicity is important to the mechanism that produced this GRB. © 2015. The American Astronomical Society. All rights reserved
Initial Results from the Nobeyama Molecular Gas Observations of Distant Bright Galaxies
We present initial results from the CO survey toward high redshift galaxies
using the Nobeyama 45m telescope. Using the new wide bandwidth spectrometer
equipped with a two-beam SIS receiver, we have robust new detections of three
high redshift (z=1.6-3.4) submillimeter galaxies (SXDF 1100.001, SDP9, and
SDP17), one tentative detection (SDSS J160705+533558), and one non-detection
(COSMOS-AzTEC1). The galaxies observed during the commissioning phase are
sources with known spectroscopic redshifts from previous optical or from
wide-band submm spectroscopy. The derived molecular gas mass and line widths
from Gaussian fits are ~10^11 Msun and 430-530 km/s, which are consistent with
previous CO observations of distant submm galaxies and quasars. The
spectrometer that allows a maximum of 32 GHz instantaneous bandwidth will
provide new science capabilities at the Nobeyama 45m telescope, allowing us to
determine redshifts of bright submm selected galaxies without any prior
redshift information.Comment: 4 pages, 1 figure, PASJ Letter Accepte
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