231 research outputs found
Quantum Group U_q(sl(2)) Symmetry and Explicit Evaluation of the One-Point Functions of the Integrable Spin-1 XXZ Chain
We show some symmetry relations among the correlation functions of the
integrable higher-spin XXX and XXZ spin chains, where we explicitly evaluate
the multiple integrals representing the one-point functions in the spin-1 case.
We review the multiple-integral representations of correlation functions for
the integrable higher-spin XXZ chains derived in a region of the massless
regime including the anti-ferromagnetic point. Here we make use of the gauge
transformations between the symmetric and asymmetric R-matrices, which
correspond to the principal and homogeneous gradings, respectively, and we send
the inhomogeneous parameters to the set of complete 2s-strings. We also give a
numerical support for the analytical expression of the one-point functions in
the spin-1 case
SiO Maser Survey toward the Inner Galactic Disk: 40 < l < 70 and |b| < 10
We present the results of an SiO maser survey for color-selected IRAS sources
in the area 40 < l < 70 and |b| < 10 in the SiO J=1-0, v=1 and 2 transitions.
We detected 134 out of 272 observed sources in SiO masers; 127 were new
detections. A systematic difference in the detection rates between SiO and OH
maser searches was found. Especially, in the color ranges with
log(F_{25}/F_{12}) smaller than -0.1, the detection rate of the SiO masers is
significantly higher than that of OH masers. We found a possible kinematic
influence of the galactic arm on the distribution of SiO maser sources. It was
found that the velocity dispersion of SiO maser sources tends to decrease with
the galactocentric distance. Using the present and previous data of SiO maser
surveys, we found that the local velocity gradient of the rotational velocity
of the Galaxy is consistent with the values obtained from other kinds of disk
population stars within a statistical uncertainty. The Oort's constants, "A"
and "B", were computed from the gradient of the rotation curve for the present
data, and were consistent with the IAU standard values. In addition, in order
to check the reliability of IRAS positions, we observed toward the MSX
positions for 5 MSX counterparts, which are located more than 20" away (but
within 60") from IRAS positions. We detected all of these 5 sources in SiO
masers.Comment: 45 pages, 11 figures, accepted by PASJ. Version with full resolution
figures is available from http://www.nro.nao.ac.jp/library/report/list.htm
SiO maser observations of a wide dust-temperature range sample
We present the results of SiO line observations of a sample of known SiO
maser sources covering a wide dust-temperature range. The aim of the present
research is to investigate the causes of the correlation between infrared
colors and SiO maser intensity ratios among different transition lines. We
observed in total 75 SiO maser sources with the Nobeyama 45m telescope
quasi-simultaneously in the SiO J=1-0 v=0, 1, 2, 3, 4 and J=2-1 v=1, 2 lines.
We also observed the sample in the 29SiO J=1-0 v=0 and J=2-1 v=0, and 30SiO
J=1-0 v=0 lines, and the H2O 6(1,6)-5(2,3) line. As reported in previous
papers, we confirmed that the intensity ratios of the SiO J=1-0 v=2 to v=1
lines clearly correlate with infrared colors. In addition, we found possible
correlation between infrared colors and the intensity ratios of the SiO J=1-0
v=3 to v=1&2 lines.Comment: 5 pages, 2 figures, iaus.cls, to appear in IAU Symp. 242 proceedings
(Astrophysical masers and their environments
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