arXiv subjects
Publications and source records attributed to H. Mouri.
The streamwise and transverse velocities are measured simultaneously in grid turbulence at Reynolds numbers 100-300. We extract typical intermittency patterns, which are consistent with velocity profiles of Burgers and Lamb-Oseen vortices. The radii of these vortex tubes are estimated to be several of the Kolmogorov length.
Old starburst galaxies are deficient in O stars, and hence do not exhibit strong line emission in the optical regime. However, there remain many B stars, which are expected to heat dust grains and generate strong continuum emission in the far-infrared. The IRAS data for a statistically complete sample of nearby galaxies reveal for the first time that such objects are as numerous as 30-40% of the local galaxy population.
By using the flux ratio [FeII]8617/[OI]6300, we demonstrate that most of the interstellar dust grains survive in shocks associated with supernova remnants and Herbig-Haro objects. The [FeII]/[OI] flux ratio is sensitive to the gas-phase Fe/O abundance ratio, but is insensitive to the ionization state, temperature, and density of the gas. We calculate the [FeII]/[OI] flux ratio in shocks, and compare the results with the observational data. When only 20% of iron is in the gas phase, the models reproduce most successfully the observations. This finding is in conflict with the current consensus that shocks destroy almost all the grains and 100% of metals are in the gas phase. We comment on previous works on grain destruction, and discuss why grains are not destroyed in shocks.
In the paper "Excitation Mechanism of Near-Infrared [Fe II] Emission in Seyfert and Starburst Galaxies" by Hideaki Mouri, Kimiaki Kawara, and Yoshiaki Taniguchi (ApJ, 528, 186 [2000]), the two panels of Figure 6 were printed into different sizes, as the result of an error in the printing process. The correct version of Figure 6 appears here.