196 research outputs found
High-sensitivity VLBI Observations of the Water Masers in the Seyfert Galaxy NGC 1068
We present observational results of water vapor maser emission with our
high-sensitivity 22 GHz VLBI imaging of the Seyfert galaxy NGC 1068. In this
galaxy, there are the following four nuclear radio sources; NE, C, S1, and S2.
Among them, the S1 component has been identified as the nucleus while the C
component has been considered as attributed to the radio jet. In our VLBI
observation, we find the following two types of the water maser emission at the
S1 component. One is the linearly aligned component that is considered as an
edge-on disk with the inner radius of 0.62 pc. The dynamical mass enclosed
within the inner radius was estimated to be by
assuming the circular Keplerian motion. Note, however, that the best fit
rotation curve shows a sub-Keplerian rotation ().
The other is the water maser emission distributed around the rotating disk
component up to 1.5 pc from the S1 component, suggesting the bipolar outflow
from the S1 component. Further, we detected the water maser emission in the C
component for the first time with VLBI, and discovered a ring-like distribution
of the water maser emission. It is known that a molecular cloud is associated
with the C component (both HCN and HCO emission lines are detected by
ALMA). Therefore, the ring-like maser emission can be explained by the jet
collision to the molecular cloud. However, if these ring-like water masing
clouds constitute a rotating ring around the C component, it is likely that the
C component also has a supermassive black hole with the mass of that could be supplied from a past minor merger of a nucleated
satellite galaxy.Comment: 16 pages, 10 figures, accepted for publication in the PAS
Suzaku Spectroscopy of an X-Ray Reflection Nebula and a New Supernova Remnant Candidate in the Sgr B1 Region
We made a 100 ks observation of the Sagittarius (Sgr) B1 region at (l, b) =
(0.5, -0.1) near to the Galactic center (GC) with the Suzaku/XIS. Emission
lines of S XV, Fe I, Fe XXV, and Fe XXVI were clearly detected in the spectrum.
We found that the Fe XXV and Fe XXVI line emissions smoothly distribute over
the Sgr B1 and B2 regions connecting from the GC. This result suggests that the
GC hot plasma extends at least up to the Sgr B region with a constant
temperature. There are two diffuse X-ray sources in the observed region. One of
the two (G0.42-0.04) is newly discovered, and exhibits a strong S XV Ka
emission line, suggesting a candidate for a supernova remnant located in the GC
region. The other one (M0.51-0.10), having a prominent Fe I Ka emission line
and a strongly absorbed continuum, is likely to be an X-ray reflection nebula.
There is no near source bright enough to irradiate M0.51-0.10. However, the Fe
I Ka emission can be explained if Sgr A* was ~ 10^6 times brighter 300 years
ago, the light travel time for 100 pc to M0.51-0.10, than it is at present.Comment: 10 pages, 10 figure
Lateral Lumbar Interbody Fusion with Percutaneous Pedicle Screw in Combination with Microendoscopic Laminectomy in the Lateral Position for Lumbar Canal Stenosis
A minimally invasive surgical (MIS) procedure is an ideal surgical procedure. Many MIS techniques have been reported in spinal surgery. In clinical practice, we often encounter two-level canal stenosis cases, in which one level shows instability and the other does not. In such a case, fusion surgery for one level and decompression surgery for the other level is ideal. LLIF/OLIF approached from the lateral side has been reported effective. MIS decompression techniques in the lateral decubitus position have never been reported. We devised a surgical method that can accomplish both fixation and decompression in a consistent lateral decubitus position
Synthesis and decrosslinking of networked polymers having zwitterion structure consisted by cyclic amidine and isothiocyanate
We have already found that the polymers, which are obtained by the polymerization of 4‐vinylphenyl isothoiocyanate after the zwitterion formation with cyclic amidines, are networked through the ionic interaction among the zwitterions becoming insoluble to various solvents. We report here on the results of the reaction of nucleophilic reagents such as amines and alcohols with the zwitterionic adduct to investigate about the decrosslinking through the resolution of ionic interactions. In the model reactions of amines and alcohols with the zwitterion compounds, which were consisted of the phenyl isothiocyanate and cyclic amidines, the reaction of nucleophilic reagents and zwitterionic adducts having methyl group at the 2‐position of the amidine proceed quantitatively. Based on the model reaction, such nucleophilic addition was applicable to decrosslinking reaction of the networked polymers containing the zwitterion structure in the side‐chain
Transtubular Endoscopic Posterolateral Decompression of the L5 Root under Navigation and O-arm: A Technical Note
Among studies evaluating minimally invasive surgical (MIS) decompression of the L5 root, techniques involving transtubular endoscopic decompression under O-arm navigation are rare. We present the case of a 68-yearold woman with left leg pain, muscle weakness and gait disturbance of one month duration. The patient underwent transtubular endoscopic decompression under O-arm navigation. There is no radiation hazard to the operating room staff with this procedure. After surgery, the patient had significant pain relief and her left lower limb motor function had improved by follow-up at one year. C-arm-free endoscopic L5 root decompression is a safe and effective procedure
Improved Inactivation Effect of Bacteria Fabrication of Mesoporous Anatase Films with Fine Ag Nanoparticles Prepared by Coaxial Vacuum Arc Deposition
We realize ultrarapid inactivation of bacteria by modifying fine Ag nanoparticles with uniform size on mesoporous anatase films with high surface areas
Synthesis of ordered mesoporous ruthenium by lyotropic liquid crystals and its electrochemical conversion to mesoporous ruthenium oxide with high surface area
In ordered to prepare high capacitance pseudo-capacitive oxides, it is important to design nanostructures with appreciable mesopores. Supramolecular templating has become a popular method to synthesize ordered mesoporous metals; however, the application of the same technique to synthesis of high surface area oxides is more demanding. We present here, the synthesis of ordered mesoporous ruthenium metal by lyotropic liquid crystal templating and its electrochemical conversion to ordered mesoporous ruthenium oxide by a simple, room temperature procedure. The bulk, unsupported metallic ordered mesoporous ruthenium exhibits high surface area of 110 m(2) g(-1), which is comparable to typical supported Ru nanoparticles. The oxide analogue gives a high specific capacitance of 376 Fg(-1), owing to the porous structure. These results demonstrate a possible facile and generic process to synthesize oxides with ordered nanostructures by utilization of the various phases that can be obtained with lyotropic liquid crystalline templates such as cubic, hexagonal, lamellar, etc.ArticleJOURNAL OF POWER SOURCES. 204:244-248 (2012)journal articl
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