826 research outputs found
CO-0.30-0.07: A Peculiar Molecular Clump with an Extremely Broad Velocity Width
The high velocity dispersion compact cloud CO-0.30-0.07 is a peculiar
molecular clump discovered in the central moleculr zone of the Milky Way, which
is characterized by its extremely broad velocity emissions () despite the absence of internal energy sources. We present new
interferometric maps of the cloud in multiple molecular lines in frequency
ranges of 265--269 GHz and 276--280 GHz obtained using the Sumbmillimeter
Array, along with the single-dish images previously obtained with the ASTE 10-m
telescope. The data show that the characteristic broad velocity emissions are
predominantly confined in two parallel ridges running through the cloud center.
The central ridges are tightly anti-correlated with each other in both space
and velocity, thereby sharply dividing the entire cloud into two distinct
velocity components (+15 km s and +55 km s). This morphology is
consistent with a model in which the two velocity components collide with a
relative velocity of 40 at the interface defined by the
central ridges, although an alternative explanation with a highly inclined
expanding-ring model is yet to be fully invalidated. We have also unexpectedly
detected several compact clumps (pc in radius) likely formed by
shock compression. The clumps have several features in common with typical
star-forming clouds: high densities (), rich
abundances of hot-core-type molecular species, and relatively narrow velocity
widths apparently decoupled from the furious turbulence dominating the cloud.
The cloud CO-0.30-0.07 is possibly at an early phase of star formation activity
triggered by the shock impact.Comment: 29 pages, 10 figures, accepted for publication in Ap
Physical Conditions of Molecular Gas in the Galactic Center
We estimated physical conditions of molecular gas in the central molecular
zone (CMZ) of the Galaxy, using our CO J=3-2 data obtained with the Atacama
Submillimeter Telescope Experiment (ASTE) in conjunction with J=1-0 12CO and
13CO data previously observed with the NRO 45m telescope. The large velocity
gradient (LVG) approximation was employed. Distributions of gas density,
kinetic temperature, and CO column density are derived as functions of position
and velocity for the entire coverage of the CO J=3-2 data. We fairly determined
physical conditions for 69 % of data points in the CMZ with >= 1 sigma CO
detections. Kinetic temperature was found to be roughly uniform in the CMZ,
while gas density is higher in the 120-pc star forming ring than in the outer
dust lanes. Physical conditions of high J=3-2/J=1-0 features are also
discussed.Comment: 8 pages, 6 figures, to appear in PAS
Grouth of G.P. zones in Al-Zn alloy
Metastable values of electrical resistivity, P(E)' obtained during isothermal ageing differs in each experimental run even when the conditions of quenching and ageing were carefully kept constant. This phenomenon is considered to result from the competitive growth of G.P.zones. The range of the values of P(E) under the same conditions of heat treatments were examined, and the results obtained are as follows: (1) Metastable values of resistivity, P(E), during ageing at 70℃ after quenching from 300℃ were in rather narrow range. On the other hand, the width of the range obtained during ageing at 50℃ was wide. (2) When the specimens were aged at first at 70℃ until the maximum values of resistivity, P(M), being reached and then aged at 50℃ for long time, the metastable values of resistivity, PE*, were obtained. And the width of discrepancy of values of P(E)* was nearly equal to that of P(E) which was obtained in the case of isothermal ageing at 70℃ after quenching from 300℃. (3) It may be concluded that the width of discrepancy of values of P(E)* becomes smaller since the width of discrepancy of the number of G.P.zones for all experiments which can grow through competitive growth is made small by 70℃ ageing than that immediately after quenching from 300℃
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