Takeshi Kamazaki

On-The-Fly Observing System of the Nobeyama 45-m and ASTE 10-m Telescopes

We have developed a spectral line On-The-Fly (OTF) observing mode for the Nobeyama Radio Observatory 45- ma nd the Atacama Submillimeter Telescope Experiment 10-m telescopes. Sets of digital autocorrelation spectrometers are available for OTF with heterodyne receivers mounted on the telescopes, including the focal-plane 5 � 5a rray receiver, BEARS, on the 45-m. During OTF observations, the antenna is continuously driven to cover the mapped region rapidly, resulting in a high observing efficiency and accuracy. Pointing of the antenna and readouts from the spectrometer are recorded as fast as 0.1 s. In this paper we report on improvements made to the software and instruments, requirements and optimization of observing parameters, the data-reduction process, and verification of the system. It is confirmed that, using optimal parameters ,t he OTF is about twice as efficient as the conventional position-switch observing method.

ASTE Observations of Warm Gas in Low-Mass Protostellar Envelopes: Different Kinematics between Submillimeter and Millimeter Lines

With the ASTE telescope, we have made observations of three low-mass protostellar envelopes around L483, B335, and L723 in the submillimeter CS (

THE MOLECULAR OUTFLOWS IN THE {rho} OPHIUCHI MAIN CLOUD: IMPLICATIONS FOR TURBULENCE GENERATION

J

Molecular Outflow Search in the ρ Ophiuchi A and B2 Regions

=7--6) and HCN (

Structure of the Dense Molecular Gas in the NGC 1333 IRAS 4 Region

J

Millimeter-Wave Interferometric Study of the ρ Ophiuchi A Region. I. Small-Scale Structures of Dust Continuum Sources

=4--3) lines. We detected both the CS and HCN lines toward all the targets, and the typical CS intensity (

Digital Spectro-Correlator System for the Atacama Compact Array of the Atacama Large Millimeter/Submillimeter Array

\sim

Skewed Distributions and Opposite Velocity Gradients of Submillimeter Molecular Lines in Low-Mass Protostellar Envelopes

1.0 K in T

Nobeyama Millimeter Array Observations of GRB 030329: a Decay of Afterglow with Bumps and Molecular Gas in the Host Galaxy

_{B}

Exploration of Southern Sky with Atacama Submillimeter Telescope Experiment (ASTE)

) is twice higher than that of the HCN line. Mapping observations of L483 in these lines have shown that the submillimeter emissions in the low-mass protostellar envelope are resolved, exhibit a western extension from the central protostar, and that the deconvolved size is