A5030716936- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Astrophysics and Cosmic Phenomena
- Aluminum Alloy Microstructure Properties
- Microwave Engineering and Waveguides
- Space Science and Extraterrestrial Life
- Electric and Hybrid Vehicle Technologies
- Soil Moisture and Remote Sensing
- Stellar, planetary, and galactic studies
- Calibration and Measurement Techniques
- Atmospheric and Environmental Gas Dynamics
- Fatigue and fracture mechanics
- Engineering Applied Research
- Scientific Research and Discoveries
- Antenna Design and Analysis
- Geological Studies and Exploration
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Real-time simulation and control systems
- Metallurgy and Material Forming
National Astronomical Observatory of Japan
2024
National Institutes of Natural Sciences
2024
Osaka Metropolitan University
2023-2024
Osaka Prefecture University
2020-2023
Tokyo Metropolitan University
2023
Yamaguchi University
2000
Abstract We report on the development and commissioning of a new Q-band receiver for Nobeyama 45 m telescope, covering 30–50 GHz with noise temperature about 15 K. name it eQ (extended Q-band) receiver. The system temperatures observations are measured to be ∼30 K at 33 ∼75 GHz. half-power beam-width (HPBW) is around 38${^{\prime \prime }}$ 43 To enhance observation capability, we tested smoothed bandpass calibration technique demonstrated that time can significantly reduced compared...
Abstract We report Atacama Large Millimeter/submillimeter Array/Atacama Compact Array observations of a high-density region the Corona Australis cloud forming young star cluster, and results resolving internal structures. In addition to embedded Class 0/I protostars in continuum, number complex dense filamentary structures are detected C 18 O SO lines by 7 m array. These substructures molecular clump that total power array as extended emission. identify 101 37 with widths few thousand...
Aim to Japan's participation in the Artemis program 2030s mind, we pursue feasibility studies of lunar telescope, including astronomical observations. Focusing on meter-wavelength observations (observing frequency lower than 50MHz), which cannot be observed harsh environments ground from Earth, ionosphere and radio interference, have reported conceptual design based results our Japan. The main scientific objectives studied so far are broadly covering following three areas: astronomy...
We have developed a wideband receiver system for simultaneous observations in CO lines of J = 2-1 and 3-2 transitions using the Osaka 1.85-m mm-submm telescope. As frequency separation system, we multiplexers that connect three types diplexers, each consisting branch-line couplers high-pass filters. The radio (RF) signal is eventually distributed into four bands, which fed to superconductor-insulator-superconductor (SIS) mixer. RF from horn divided two bands by diplexer with fractional...
The corrugated horn is a high performance feed often used in radio telescopes. There has been growing demand for wideband optics and horns millimeter submillimeter-wave receivers. It improves the observation efficiency allows us to observe important emission lines such as CO multiple excited states simultaneously. However, millimeter/submillimeter band, it challenging create conical with fractional bandwidth of ~60% because wavelength very short, making difficult make narrow corrugations. In...
In modern radio astronomy, one of the key technologies is to widen frequency coverage an instrument. The effects higher order modes on instrument associated with wider bandwidths have been reported, which may degrade observation precision. It important quantify propagation modes, though their power too small measure directly. Instead direct measurement we make attempt deduce them based measurable radiation patterns. Assuming a linear system, whose radiated field determined as superposition...
We report on ALMA ACA observations of a high-density region the Corona Australis cloud forming young star cluster, and results resolving internal structures. In addition to embedded Class 0/I protostars in continuum, number complex dense filamentary structures are detected C18O SO lines by 7m array. These sub-structures molecular clump that TP array as extended emission. identify 101 37 with few thousand AU widths SO, respectively, called feathers. The typical column density feathers is...
We report on the development and commissioning of a new Q-band receiver for Nobeyama 45-m telescope, covering 30--50 GHz with noise temperature about 15 K. name it eQ (extended Q-band) receiver. The system temperatures observations are measured to be $\sim$ 30 K at 33 75 45 GHz. Half-Power-Beam-Width (HPBW) is around 38\arcsec 43 To enhance observation capability, we tested smoothed bandpass calibration technique demonstrated time can significantly reduced compared standard position switch...
Abstract We have conducted Q-band (30–50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with extended (eQ) receiver installed on Nobeyama 45 m radio telescope. Approximately 180 lines been detected, including tentative detection, and these are attributed to 52 molecules isotopologues. It has found that this position is rich species as much Cyanopolyyne Peak Taurus Molecular Cloud-1 (TMC-1 CP), suggesting chemical youth. Not only...
We have conducted Q-band (30 GHz $-$ 50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with extended (eQ) receiver installed on Nobeyama 45 m radio telescope. Approximately 180 lines been detected including tentative detection, and these are attributed to 52 molecules isotopologues. It has found that this position is rich species as much Cyanopolyyne Peak Taurus Molecular Cloud-1 (TMC-1 CP), suggesting chemical youth. Not only...
We report the current status of NASCO (NAnten2 Super CO survey as legacy) project which aims to provide all-sky data cube southern hemisphere using NANTEN2 4-m submillimeter telescope installed at Atacama Desert through developing a new multi-beam receiver and control system. The consists 5 beams. four beams, located corners square with beam separation 720′′, are 100 GHz band SIS having 2-polarization sideband-separation filter. other beam, optical axis, is 200 cooled component modularized...
The 1.85-m mm-submm telescope has been operated at Nobeyama Radio Observatory to observe molecular clouds in the nearby Galactic Plane based on lines of <sup>12</sup>CO, <sup>13</sup>CO, C<sup>18</sup>O(J = 2–1). We are planning relocate a site (∼2,500 m) Atacama Desert Chile and newly install dual-band receiver for simultaneous observations CO isotopes with transitions J 2–1 3–2. In order achieve this goal, we have developed wideband diplexer separate radio frequency (RF) 211–275 GHz (ALMA...
Currently, we are performing a large-scale survey of molecular clouds toward the Galactic Plane in <sup>12</sup>CO, <sup>13</sup>CO, and C<sup>18</sup>O(J = 2–1) with 1.85-m mm-submm telescope from Nobeyama Radio Observatory. In addition, proceeding preparation new project to observe several additional lines including higher transitions CO isotopes, such as 2–1, 3–2) simultaneously wideband receiver (210–375 GHz). The optics has Cassegrain reflector antenna Nasmyth beam-waveguide feed is...
Abstract We developed a new seven-beam heterodyne receiver “7BEE” in the 72–116 GHz band for Nobeyama 45 m telescope to investigate early stage of star formation by deriving deuterium fraction dense cores. The optics employs wideband corrugated horns covering and dielectric lenses couple incoming radiation from antenna on feeds. One important aspects lens design is anti-reflection (AR) structure mitigate reflections surfaces. Triangular grooves, which gradually change effective refractive...
We report the current status of NASCO (NAnten2 Super CO survey as legacy) project which aims to provide all-sky data cube southern hemisphere using NANTEN2 4-m submillimeter telescope installed at Atacama Desert through developing a new multi-beam receiver and control system. The consists 5 beams. four beams, located corners square with beam separation 720$''$, are 100 GHz band SIS having 2-polarization sideband-separation filter. other beam, optical axis, is 200 cooled component modularized...
We report the current status of 1.85-m mm-submm telescope installed at Nobeyama Radio Observatory (altitude 1400 m) and future plan. The scientific goal is to reveal physical/chemical properties molecular clouds in Galaxy by obtaining large-scale distributions gas with an angular resolution several arcminutes. A semi-automatic observation system created mainly Python on Linux-PCs enables effective operations. CO $J=$2--1 survey (e.g., Orion-A/B, Cygnus-X/OB7, Taurus-California-Perseus...
We report the current status of 1.85-m mm-submm telescope installed at Nobeyama Radio Observatory (altitude 1400 m) and future plan. The scientific goal is to reveal physical/chemical properties molecular clouds in Galaxy by obtaining large-scale distributions gas with an angular resolution several arcminutes. A semi-automatic observation system created mainly Python on Linux-PCs enables effective operations. CO J =2–1 survey (e.g., Orion-A/B, Cygnus-X/OB7, Taurus- California-Perseus...