267 research outputs found
Origin of the dust emission from Tycho's SNR
Aims: We investigate the spatial distribution of dust emission around Tycho's
SNR to understand its origin. We distinguish the dust associated with the SNR
from that of the surrounding ISM. Methods: We performed mid- to far-infrared
imaging observations of the remnant at wavelengths of 9, 15, 18, 24, 65, 90,
140, and 160um using the Infrared Camera and the Far-Infrared Surveyor onboard
AKARI. We compared the AKARI images with the Suzaku X-ray image and the 12CO
image of Tycho's SNR. Results: All the AKARI images except the 9, 140, and
160um band images show a shell-like emission structure with brightness peaks at
the north east (NE) and north west (NW) boundaries, sharply outlining part of
the X-ray shell. The 140 and 160um bands are dominated by cold dust emission
from the surrounding ISM near the NE boundary. Conclusion: We conclude that the
dust emission at the NE boundary comes from the ambient cloud interacting with
the shock front, while the origin of the dust emission at the NW boundary is
rather unclear because of the absence of prominent interstellar clouds near the
corresponding region. We cannot rule out the possibility that the latter is
mostly of an SN ejecta origin.Comment: Accepted for publication in A&A lette
Near-Infrared [Fe II] and H2 Line Observations of the Supernova Remnant 3C 396: Probing the Pre-supernova Circumstellar Materials
We present the results of near-infrared [Fe II] and H2 line imaging and
spectroscopic observations of the supernova remnant 3C 396 using the Palomar 5
m Hale telescope. We detect long, filamentary [Fe II] emission delineating the
inner edge of the radio emission in the western boundary of the remnant in
imaging observations, together with a bright [Fe II] emission clump close to
the remnant center. There appears to be faint, diffuse [Fe II] emission between
the central clump and the western filamentary emission. The spectroscopic
observations determine the expansion velocity of the central clump to be ~56
km/s. This is far smaller than the expansion velocity of 3C 396 obtained from
X-ray observations, implying the inhomogeneity of the ambient medium. The
electron number density of the [Fe II] emission gas is < 2,000 cm-3. The H2
line emission, on the other hand, lies slightly outside the filamentary [Fe II]
emission in the western boundary, and forms a rather straight filament. We
suggest that the [Fe II] emission represents dense clumps in the wind material
from the red supergiant phase of a Type IIL/b progenitor of 3C 396 which have
been swept up by the supernova remnant shocks. The H2 emission may represent
either the boundary of a wind bubble produced during the main-sequence phase of
the progenitor or molecular clumps left over inside the bubble. We propose that
the near-infrared [Fe II] and H2 emission observed in several supernova
remnants of Type IIL/b SNe likely has the same origin.Comment: 24 page including 8 figures; Accepted by Ap
Pull-Out Resistance Capacity of a New Perfobond Shear Connector for Steel Pile Cap Strengthening
This study proposes a new type of the perfobond shear connector, which can be used to strengthen the steel pile cap embedded into the structure foundation, and evaluates its pull-out resistance capacity by performing a test on ten specimens. Test parameters include the embedment length of the shear connector, existence of transverse rebars passing through holes in the shear connector, and their shape, size, and number. The pull-out load versus slip curve is plotted for all specimens, and their failure modes are identified. The effects of the test parameters on the peak pull-out load are examined in this work. The test results show that the perfobond shear connector proposed in this study can retain the peak pull-out load up to 6 times higher than the one without any holes. This indicates that the existence of holes in the shear connector enables the dowel action of concrete inside the hole, resulting in the improvement of the shear resistance capacity of the connector
Infrared Studies of Molecular Shocks in the Supernova Remnant HB21: I. Thermal Admixture of Shocked H_2 Gas in the North
We present near- and mid-infrared observations on the shock-cloud interaction
region in the northern part of the supernova remnant HB21, performed with the
InfraRed Camera (IRC) aboard AKARI satellite and the Wide InfraRed Camera
(WIRC) at the Palomar 5 m telescope. The IRC 7 um (S7), 11 um (S11), and 15 um
(L15) band images and the WIRC H2 v = 1 -> 0 S(1) 2.12 um image show similar
shock-cloud interaction features. We chose three representative regions, and
analyzed their IRC emissions through comparison with H2 line emissions of
several shock models. The IRC colors are well explained by the thermal
admixture model of H2 gas--whose infinitesimal H2 column density has a
power-law relation with the temperature T, dN ~ T^-b dT--with n(H2) ~ 10^3
cm^-3, b ~ 3, and N(H2 ;T > 100K) ~ 3x10^20 cm^-2. The derived b value may be
understood by a bow shock picture, whose shape is cycloidal (cuspy) rather than
paraboloidal. However, this picture raises another issue that the bow shocks
must reside within ~0.01 pc size-scale, smaller than the theoretically
expected. Instead, we conjectured a shocked clumpy interstellar medium picture,
which may avoid the sizescale issue while explaining the similar model
parameters. The observed H2 v = 1 -> 0 S(1) intensities are a factor of ~17 -
33 greater than the prediction from the power-law admixture model. This excess
may be attributed to either an extra component of hot H2 gas or to the effects
of collisions with hydrogen atoms, omitted in our power-law admixture model,
both of which would increase the population in the v = 1 level of H2.Comment: 14 pages, 9 figures, ApJ accepted, higher resolution @
http://astro.snu.ac.kr/~jhshinn/ms.pd
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